RE: [RCSE] Foam
You can buy EPP Foam from CST The Composite Store. It is available on line at http://www.cstsales.com/CMHotWire.htm . Matt -Original Message- From: John Marien [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 05, 2005 7:45 AM To: 'RCSE' Subject: Re: [RCSE] Foam Sounds like your friend is looking for EPP foam. I too would like to know of a good source for this foam. John On Wed Oct 5 6:01 , 'Andrew Famiglietti' <[EMAIL PROTECTED]> sent: Whenever I need to know I contact the most knowledgeable ...You guys. Perhaps you can help again.A friend (not on this exchange) asked where he could get a certain kind of foam. He didn't know the name of it and could only describe it to me. It has a rubbery course texture to it and when compressed and released it returns to its original shape. Sometimes it's in boxes supporting computers, or other electronic items. He has seen it and says its blue in color. What he wants to know is where he can get a chunk of it approx. 10" thick. He would also like to know how to cut it to shape. Andrew RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] kevlar tow - spar wrapping
It is under Aramid Unidirectional on the CST web site it is Denier 195 yarn. This is the terminology used in the composites industry. The number is the weight in grams of 9000 meters of the yarn. This is confusing because only Kevlar (Aramid) uses this terminology. Matt Gewain CST -Original Message- From: Douglas, Brent [mailto:[EMAIL PROTECTED] Sent: Friday, May 27, 2005 6:55 AM To: soaring@airage.com Subject: [RCSE] kevlar tow - spar wrapping For anyone that's done a Bubble Dancer or Allegro, or anyone that's used a kevlar wrap on a composite spar - what kind of tow did you use? I checked ACP and CST, found thread, .025, and .038 braided - I am leaning towards the thread based on thickness alone. I'm open to suggestions from someone that's been down this road already. Plan B was dental floss, but I'd rather do this project to spec. Thanks, Brent RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] Carbon Pushrod Help!
I always use THICK FLEXABLE CA GLUE like IC 2000. Cut the end of the carbon rod off with diagonal cutters. This crushes and splinters the end a little and helps the glue grab on to the rod. Then I clean up the inside of the brass with a small file. Use plenty of glue so some glue forms a fillet at the end of the metal fitting. When I want to reuse the metal fittings from an old model I heat up the metal with a soldering iron and the fitting will pull lose. Matt Gewain -Original Message- From: John Fruge [mailto:[EMAIL PROTECTED] Sent: Monday, March 07, 2005 10:29 AM To: soaring@airage.com Subject: [RCSE] Carbon Pushrod Help! I had a carbon pushrod brass end come off in flight over the weekend. I would like to hear options on putting on the brass ends to the carbon pushrods? Thanks, John Fruge RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] Carbon Pushrod Sorce
CST has the pushrod sets available on line at cstsales.com Bondable tubing is also available, we will change the kits to include the bondable tubing if you request it. The best way to do this is call the Toll Free order desk number at 800-338-1278. If you want to order by E-Mail address it to [EMAIL PROTECTED] Thanks Matt Gewain -Original Message- From: John Fruge [mailto:[EMAIL PROTECTED] Sent: Sunday, February 27, 2005 7:33 AM To: soaring@airage.com Subject: [RCSE] Carbon Pushrod Sorce I a'm in the market for some carbon pushrods. I would like to order them online if possable. I need 2 sets. One for a new RES sailplane and the other set will be for retrofit of another RES sailplane. I need the inner and outer and would like to be able to glue them in. I normally would have done some searching on RCgroups but its been down. Thanks, John Fruge RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] Carbon fiber reinforced spars
The easiest type of carbon to use is the Unidirectional Carbon Laminate strips the same width as the wooden spars in the wing. Typically they are only needed in the center part of the wing. Just glue them on the top and bottom (outer surfaces) of the wooden spars. I recommend thick flexible type CA glue. I also recommend that you wrap the carbon and wood spar with thin Kevlar thread and CA that on. (one wrap every 1/4 to 1/2 inch is enough) The thickness depends on how much added strength you want. Generally .014 to .030, for a little extra strength to a spar cap that will no doubt out lives the rest of the model. Of course you will need to cut the notches in each rib a little deeper for the thicker spars. Matt Gewain CST The Composite Store -Original Message- From: Wes Gibson [mailto:[EMAIL PROTECTED] Sent: Sunday, January 23, 2005 8:27 PM To: RCSE Subject: [RCSE] Carbon fiber reinforced spars Building a new woodie RES and this time I want to reinforce the top and bottom spars with carbon fiber. I've been looking over the CST and Aerospace Composite Products web sites ending up with more questions than answers. I know I should use unidirectional carbon fiber, but what's easier to use: tapes or tow? What thicknesses are recommended? I don't have a vacuum bagging system, so I'll have to use old fashion phone books to weight the stuff while the epoxy dries. I did find an informational article by Bob Vixie which helped out a lot, but he didn't talk about thicknesses. Anyway, what does everybody recommend out there. Wes Gibson AMA 607029 LSF 7533 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.7.0 - Release Date: 1/17/2005 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] Carbon Fiber Push rods
CST The Composite Store has long carbon rods available. They are .050 and .070 diameters in 72" lengths. Call the order desk for more information. 800-338-1278 -Original Message- From: mike remus [mailto:[EMAIL PROTECTED]] Sent: Thursday, June 13, 2002 5:38 PM To: [EMAIL PROTECTED] Subject: [RCSE] Carbon Fiber Push rods Can anyone help me locate carbon fiber suitable for push rods measuring .075 diameter x 53 inches in length? I want to replace the fiberglass rods in my Sharon. Thanks in advance Mike Remus Fort Wayne IN Your Dreams are the seedlings of reality!!! GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] 5ft carbon tubes
Tim; You can get wrapped tubes in 5 ft lengths from CST. The sizes and prices are listed on this page www.cstsales.com/carbon-tubes.htm Note that the diameters listed are for the inside of the tube. Matt Gewain -Original Message- From: Tim Vandenheuvel [mailto:[EMAIL PROTECTED]] Sent: Monday, March 04, 2002 11:52 AM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: [RCSE] 5ft carbon tubes Hi all, I am looking for 5ft long carbon tubes, approx. 3/8" in dia.. A larger diameter would be fine. Does anyone have any leads? TIA Tim Vandenheuvel 2310A East Division St. Mount Vernon, WA 98274 1-360-428-4937 _ Send and receive Hotmail on your mobile device: http://mobile.msn.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Win up to $1000 if you build the Stongest Light Weight Wings
I don't think anyone will get to the 300 lb load that will give him or her a guaranteed winner. Nevertheless, I needed to put an upper limit on the test just in case some brilliant design carried a load that exceeded my test capability. Matt Gewain -Original Message- From: Brett Jaffee [mailto:[EMAIL PROTECTED]] Sent: Monday, October 01, 2001 5:30 PM To: Matt Gewain Cc: Andy Page; [EMAIL PROTECTED] Subject: Re: [RCSE] Win up to $1000 if you build the Stongest Light Weight Wings OTOH, there can be multiple winners, so the prize could be much less. I think this contest sounds cool, but since the title is "Strongest LIGHT WEIGHT Wings," shouldn't the lightest wing that passes the test be the winner? Just a thought. Either way, it's a cool contest. Matt Gewain wrote: > > But look at the return on your investment if you have the best design 30 > grams is not much material. How much composite material can you buy for > $500. > > Matt Gewain > > -Original Message- > From: Andy Page [mailto:[EMAIL PROTECTED]] > Sent: Monday, October 01, 2001 4:53 PM > To: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: Re: [RCSE] Win up to $1000 if you build the Stongest Light Weight > Wings > > That's brilliant! > ...buy our product, then stop by and we'll break it for you... > Bolder marketing has never been known. > > >From: "Matt Gewain" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >Subject: [RCSE] Win up to $1000 if you build the Stongest Light Weight > >Wings > >Date: Mon, 1 Oct 2001 16:37:06 -0700 > >MIME-Version: 1.0 > >Received: from [63.140.43.61] by hotmail.com (3.2) with ESMTP id > >MHotMailBD8248D7009B400437613F8C2B3D0D6B0; Mon, 01 Oct 2001 16:36:17 -0700 > >Received: from flyby.airage.com ([192.168.1.62]) by List.airage.com > > (Post.Office MTA v3.5.3 release 223 ID# 35-56975U100L100S0V35) > >with ESMTP id com for <[EMAIL PROTECTED]>; Mon, 1 Oct 2001 > >19:37:35 -0400 > >Received: from clopin.netmeister.net ([206.117.248.2]) by flyby.airage.com > > (Post.Office MTA v3.5.3 release 223 ID# 35-56975U100L100S0V35) > > with ESMTP id com for <[EMAIL PROTECTED]>; Mon, 1 Oct 2001 > >19:36:40 -0400 > >Received: from desk (hugo22.netmeister.net [206.117.248.122])by > >clopin.netmeister.net (8.9.3/8.9.3) with SMTP id QAA79993for > ><[EMAIL PROTECTED]>; Mon, 1 Oct 2001 16:35:33 -0700 (PDT)(envelope-from > >[EMAIL PROTECTED]) > >From [EMAIL PROTECTED] Mon, 01 Oct 2001 16:38:01 -0700 > >Message-ID: <[EMAIL PROTECTED]> > >Importance: Normal > > > >We (CST The Composites Store) are going to try something new this year at > >the AMA Convention in Pasadena in January and again at the Weak Signals > >Expo > >in April. We are going to have a contest at each of these trade shows to > >see who can build the strongest wing. On the last day of the trade show, > >we > >will set up a three-point load tester in our booth and break wings and > >measure the failure load. The rules for the contest are simple they are > >spelled out on our web site, just follow this link. > > > >http://www.cstsales.com/strongest_light_weight_wing_cont.htm > > > >You don?t have to be at the trade shows to win and we would like to get > >entries from as many model builders as possible. So, start building now > >and > >request an entry form from CST. The entry forms won?t be available until 1 > >November because I am going to be at flying contests, but call our shop and > >we will send you an entry form. > > > >Matt Gewain > > > > _ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and > "unsubscribe" requests to [EMAIL PROTECTED] > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] -- _ Brett Jaffee [EMAIL PROTECTED] R/C Slope and Power Homepage http://home.earthlink.net/~jaffee The Unoffical Extra 300 Home Page http://members.nbci.com/bjaffee/extra300/ OnTheWay Quake 3 Server Utility http://www.planetquake.com/ontheway _ RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Win up to $1000 if you build the Stongest Light WeightWings
The wing is supported at both ends and loaded in the middle, I would call that a whole wing. It is not a cantilever wing supported at one end and loaded at the other. Matt Gewain -Original Message- From: Brett Jaffee [mailto:[EMAIL PROTECTED]] Sent: Monday, October 01, 2001 5:26 PM To: Matt Gewain Cc: John Erickson; Soaring List Subject: Re: [RCSE] Win up to $1000 if you build the Stongest Light WeightWings I'm not sure if this is clear or not, but is it a whole wing (ie, left and right wing tip), or half a wing (a wing tio and a root)? Matt Gewain wrote: > > No we want to keep the rules as simple as possible so any airfoil can be > used or in other words you can build a plank that meet all the rules. > > Matt Gewain > > -Original Message- > From: John Erickson [mailto:[EMAIL PROTECTED]] > Sent: Monday, October 01, 2001 4:42 PM > To: Matt Gewain; Soaring List > Subject: Re: [RCSE] Win up to $1000 if you build the Stongest Light > WeightWings > > Matt, > > Sounds like a great contest, like the bridge building contest we had in > engineering. One question: Does the wing have to have any airfoil, or can > the section just be a "plank"? > > JE > -- > Erickson Architects > John R. Erickson, AIA > > > From: "Matt Gewain" <[EMAIL PROTECTED]> > > Date: Mon, 1 Oct 2001 16:37:06 -0700 > > To: <[EMAIL PROTECTED]> > > Subject: [RCSE] Win up to $1000 if you build the Stongest Light Weight > Wings > > > > We (CST The Composites Store) are going to try something new this year at > > the AMA Convention in Pasadena in January and again at the Weak Signals > Expo > > in April. We are going to have a contest at each of these trade shows to > > see who can build the strongest wing. On the last day of the trade show, > we > > will set up a three-point load tester in our booth and break wings and > > measure the failure load. The rules for the contest are simple they are > > spelled out on our web site, just follow this link. > > > > http://www.cstsales.com/strongest_light_weight_wing_cont.htm > > > > You don't have to be at the trade shows to win and we would like to get > > entries from as many model builders as possible. So, start building now > and > > request an entry form from CST. The entry forms won't be available until > 1 > > November because I am going to be at flying contests, but call our shop > and > > we will send you an entry form. > > > > Matt Gewain > > > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] -- _ Brett Jaffee [EMAIL PROTECTED] R/C Slope and Power Homepage http://home.earthlink.net/~jaffee The Unoffical Extra 300 Home Page http://members.nbci.com/bjaffee/extra300/ OnTheWay Quake 3 Server Utility http://www.planetquake.com/ontheway _ RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] AVIA G Force Carbon Tubes ( HLG Tail Booms) Now at CST The Composite Store
CST The Composite Store now sells AVIA G Force Tapered Carbon Tubes in six different sizes. The tubes are all 40 inches long. The longer length allows the model builder to adjust the tube stiffness by cutting off the smaller or larger end of the tapered tube when they cut it to the length they need. The details are listed on the following page: http://www.cstsales.com/AVIA%20G-Force%20Carbon%20Tubes.htm Thanks Matt Gewain RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] spar-sizing calculations
Bill; This calculation gives you the minimum spar cap size and the maximum deflection at the maximum load. The stress in the spar caps (sigma) will be reduced in proportion to any increase in the cross section area of the spar caps. Therefore, if you double the size of the spar caps the stress and the tip deflection go to half the previous value. Then you can stand on the winch without any problems. Matt Gewain -Original Message- From: Bill Harris [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 8:57 AM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: [RCSE] spar-sizing calculations I'm building a Windfree nostalgia sailplane with strengthened wings, and utilizing a balsa-core carbon spar construction with the built-up wing, per the Allegro-Lite. Using Mark Drela'a "spar sizing" suggestions at: http://www.charlesriverrc.org/articles/allegro2m/spar_sizing.txt I get a spar that uses .042 and .028 single tapered (to .007) CF laminate with a spar width of .25" and a spar height of .60" with a .25" steel wingrod. This should withstand a "reasonable" winch load for this class of sailplane, as well as be very light. In a way, this is a similar to the "de-rated" spar used on the Allegro-Light-Electric. All looks good until I get to the estimated tip deflection calculation. Yikes!!! It comes out to be 28 inches! Not much I can do here... the only variable I could work with is the spar height, and that can't change. What does this "tip deflection" mean? Under what conditions does it occur? >From the formula d= b^2 sigma / (4Eh), there is no input for wing/winch load, so I assume that this is the maximum deflection that the _spar_ will take before failure. I'm guessing that the D-tube sheeting and LE/TE might also fail before this maximum spar deflection is reached. It may not matter, but I'm picking at the details on this building exercise... --Bill _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] vacumn bagging supplies,
Bill; You can get all your vacuum bagging supplies at CST The Composites Store. The web site is www.cstsales.com and you can order at 800-338-1278. Matt Gewain -Original Message- From: Bill Conkling [mailto:[EMAIL PROTECTED]] Sent: Tuesday, July 17, 2001 8:21 PM To: [EMAIL PROTECTED] Subject: [RCSE] vacumn bagging supplies, I am looking for some equipment and materials for bagging wings, etc. I can't seem to find the bookmarks I made. Can anyone help, Please.?! bc ([EMAIL PROTECTED]) Williamsburg, VA (USA) RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Kevlar
Danny; You can get Kevlar Thread from us at CST just call our order desk 1-800-338-1278 A 400 Yard Spool is $18.00 plus shipping. Matt Gewain Composite Structures Technology www.cstsales.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 16, 2001 7:37 PM To: [EMAIL PROTECTED] Subject: [RCSE] Kevlar Dudes I'm looking for Kevlar thread, any ideas. Denny www.polecataero.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] RE: Poor Man's Vacuum Bag System
For the one pound white foam 6 inches of mercury (about 3 psi)is the most you can use without crushing your wing. We were the first company to sell a reliable electric vacuum bagging system, and the first to sell a very inexpensive system. The biggest difference between the systems is the pump that is used. The pumps that are commonly used in the very inexpensive systems have very poor reliability, the vacuum suction can not be adjusted and the pump suction can very a lot from one pump to the next. The worst thing about these cheep pumps is that they have a very low flow rate so if you do not have a nearly perfect seal on the bag they will not provide hardly any vacuum to the bag. Because of all the problems we discontinued these cheep pumps very quickly. Matt Gewain Composite Structures Technology is 7" enough vacuum for most applications? When do we more or less? How much vacuum do you guys use? Cheers Kjelli >From: "Nathan & Marni Woods" <[EMAIL PROTECTED]> >Reply-To: <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Subject: [RCSE] RE: Poor Man's Vaccum Bag System >Date: Tue, 7 Nov 2000 22:03:39 -0800 > >Check out this little deal: > >http://www.nesail.com/ezvac.html > >$109.95 complete! > >Nathan Woods > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Spar strength
Greg; Back around 1980 I spent a lot of time building a computer program that would analyze the stresses in a model wing, and predict how the wing would fail. At the time my wings were mostly wood with a little carbon and glass fiber, and the program did predict some failures well. But I stopped using the program because it would only analyze a few of the ways a wing could fail and the program required a lot of data entry to define the wings structure. These same problems would have to be addressed today although the computers are much better. Matt Gewain Composite Structures Technology I have looked a Joe Wurts wing lay-up spreadsheet it looks like a good way to go. I was just wondering if there is a spreadsheet for figuring out spar strength if you wanted to avoid the use of so much carbon fiber. -- Greg Nuspel RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Adding 'tint' to epoxy
Jeff; We sell 8 colors of pigments for epoxy. They are all neon colors and give the models great visibility. The colors are transparent so any variation in the amount of epoxy in the wing skin results in a variation in color. I have been replacing the Mylar in the vacuum bag with a layer of Teflon coated glass and thin breather. This allows any excess epoxy and trapped air to be bleed off under vacuum. The result is an even neon color and no air bubbles. The wings do need to be sanded with some 400 and finer sandpaper to give them a smoother surface. Thanks Matt Gewain The Composites Store www.cstsales.com I wanting to try something different and add 'tint' to my epoxy mix prior to bagging a pink core foam wing. I was thinking about adding a little blue tint to the epoxy so that the wing would come out purple after bagged. I could paint the mylars, but I was looking for a really light way of doing it. What are people using to add tint to epoxy?? Food coloring? Dye? Thanks again, Jeff Winder Cincinnati, OH RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Avia tail booms
John; You should try our Stamov booms they are produced to use as model tail booms and they are very light and very stiff. By far the best combination I have seen. The standard booms are 14 to 15 grams each .6" to .3" taper over 36 inches. We have a few 11 gram booms at the same dimensions, these booms are not as strong or stiff, that is the trade off when they get that light. They are listed on our web site www.cstsales.com or you can call our toll free number and get the details. 1-800-338-1278 Thanks Matt Gewain The Composites Store -Original Message- From: Kappus, John [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 18, 2000 6:02 PM To: '[EMAIL PROTECTED]' Subject: [RCSE] Avia tail booms I build a 7oz 60" HLG with a mid length boom of the Avia G-force using the BIG end of the taper. This results in a light fuse of less than .75 oz. However, I believe that this is not quite stiff enough for a hard throw at launch. At launch, an odd thing happens with this boom. Even with a bit of launch UP preset, the throw goes straight out for farther than normal before pitching up when the speed and loads go down. With a stiffer boom (like a Shark kite spar at +.25oz more), the up response is more immediate. I'm still searching for the perfect combination including molding a little more carbon down the boom during fuse mfg. -- Tom Broeski writes: >http://www.intothewind.com Their Avia wrapped tapered carbon tubes are perfect for HLG tailbooms. At about $8 these aren't cheap, but they are almost half the weight of pultruded tubes for a given bending stiffness. They are also much better in torsion. They have three weight - stiffness grades: Skinny Ultralight 7.7g , stiffness =1.8 Skinny Super UL11.7g , stiffness =3.2 G-force Ultralight 13.0g , stiffness=4.9 The weights are for the shorter 32.5" lengths. The stiffness numbers are relative. The two Skinnys have the same ID's but different wall thicknesses. The G-force has a larger ID and hence a much better stiffness/weight ratio. The big end of the Skinny Ultralight is perfect for 3-4oz , 30"-40" gliders. For a 60" glider the small end of the G-force is probably just right. - Mark Drela RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] High Performance Epoxy ? What do I use?
The post curing recommended for MGS 285 Epoxy is 18 hours at 50 to 60 C (120 to 140 F). I use a small space heater with a fan in a large card board box with a digital thermometer to monitor the temperature. The trunk of your car will easily get warmer than that on a hot day. Pro-Set gives data for 110 ,140 and 180 F for 8 hrs. Most model builders think that longer pot life epoxy is stronger, but if you look at the West System, Pro-Set and MGS Epoxy this correlation in not shown in the test data. The test data does show small variations in strength with different hardener mixtures but strength does not improve with longer pot life. The data does show that post curing Pro-Set and MGS does improve the strength and heat tolerance of these systems substantially, but it does not help West System Epoxy. As far as which Epoxy to use I would recommend the West System Epoxy for finishing a wooden model or bonding wood skins to a foam core and even making a mold if you are careful to keep the post cure temperature on the parts at or slightly below 120 F. If you are vacuum bagging a composite skin wing with carbon and glass or molding a wing or fuselage for a model that will be launched, flown or landed hard, I would use a high performance epoxy on these parts and post cure them. Sincerely Matt Gewain - -Original Message- From: Kjell-Arne Fjelde [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 11, 2000 7:21 AM To: [EMAIL PROTECTED] Subject: [RCSE] High Performance Epoxy ? What do I use? What is "post curing"?, and is this some kind of method that should/could be used on "regular" epoxy? How can one know what kind of epoxy one uses?(im thinking of strenght) Curing time maybe? Anyone got any good links that explaines these things? Am I way off when i presume that curing time is related to strenght by long curing time = stronger epoxy? Regards Kjelli >From: "Matt Gewain" <[EMAIL PROTECTED]> >To: "Bernard F Ahyow" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]> >Subject: RE: [RCSE] MGS High Performance Epoxy >Date: Tue, 11 Jan 2000 07:04:57 -0800 > >Bernard Ahyow; > > The MGS Epoxy is a high performance structural epoxy with properties >similar to the Pro-Set Epoxy system we have been selling for many years. >This last year the F3B team used MGS Epoxy to mold many of their new >models, >and asked us to add it to our line. We now have the systems in stock in >both quart and gallon sizes in both a 200 and a 300 system. The test data >shows that the 200 system is stronger, but the 300 system is less >expensive. >All of these high performance epoxy systems require post curing but the pay >off is that they are 60% stronger then the West System Epoxy. > >Attached is a page with some of the test data on MGS Epoxy and one popular >Pro-Set mixture. > >Thanks >Matt Gewain >Composite Structures Technology >www.cstsales.com > > > >-Original Message- >From: Bernard F Ahyow [mailto:[EMAIL PROTECTED]] >Sent: Sunday, January 09, 2000 9:20 PM >To: [EMAIL PROTECTED] >Subject: [RCSE] MGS High Performance Epoxy > > >Hey Composite Nutz, > >I've been reading the full size kitplanes lists and have run across >references >to the MGS epoxy system. Upon getting ready to order from CST I noticed >that they >now stock the stuff. So what's the deal? I know that the most common >epoxy >used >in models in West System laminating resin which is eschewed by the kitplane >builders >as inadequate. So what's different about this new stuff? Also is this the >blue >epoxy used now by Brian Mclean? Thanks for your time. > >Bernard Ahyow >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and >"unsubscribe" requests to [EMAIL PROTECTED] ><< comparison_of_mgs_epoxy_to_pro.htm >> __ Get Your Private, Free Email at http://www.hotmail.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] need source for milled glass
The Composites Store now sells milled glass in 1 lb. boxes. We have had many requests so we added it to our catalog this year. Its not listed on our web site www.cstsales.com because I have not got the updates completed, but you can call our order desk 1-800-338-1278 and we will be happy to send it right away. Thanks Matt Gewain -Original Message- From: Donna Unruh [mailto:[EMAIL PROTECTED]] Sent: Wednesday, December 22, 1999 7:32 PM To: [EMAIL PROTECTED] Subject: [RCSE] need source for milled glass Anyone know of a supplier for milled glass? Thanks, Dave Hauch RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Unidirectional Carbon Handling
Mike; Instead of using carbon fiber tow which is very hard to taper and tends to ball up as you handel it. You should use one of the unidirectional carbon fabrics. These fabrics are tow that has been flattened and coated with a material that dissolves in the epoxy as you lay up the wing. The individual tows are held parallel by either a light cross thread or a light web. We sell many forms of unidirectional carbon fabric but the most commonly used are the 3.0 oz with a Tacky Thread binder, or the 3.7 oz with a Gapped Web binder. You can look at the different fabrics on our web site at Matt Gewain The Composites Store At 07:08 PM 9/20/99 -0600, Mike Berends wrote: >Hi All, > >I'm just about to lay-up a few HLG wings and am using Unidirectional >Carbon for the darts. This is the first time that I am using this stuff >and was wondering if there was a really good way of handling it without >getting all the strands all messed up while trying to place it and wet >it out? I'd really appreciate any input. > >I was thinking about using something to hold the carbon down while I cut >it into darts and then transfer it onto the wing, or glass, using >something sticky (3M Spray 77?). > >Also if anyone out there has any experience laying up HLG wings I'd like >to hear their inputs of do's and don'ts. Especially any input on LE edge >doublers.. > >Thanks in advance, >Mike Berends > > > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] glue injector?
Small disposable syringes for glue are available at THE COMPOSITES STORE. They are listed on our web site under "Epoxy Application Tools". Check our web site at www.cstsales.com Matt Gewain Composite Structures Technology At 12:45 PM 9/3/99 -0600, Berris Edward wrote: >The wing skin on my Samari has delaminated in a few spots. I saw a glue >injector that resembles a syringe but with a couple of important >differences. One was that the plunger screws in rather than simply >being pushed down. The second difference is that instead of a needle >there is a very fine needle like device that has a 90 degree bend in it >so that glue can be shot in side ways. > >Does anyone know where to find one? > >Ed >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] glassing
It sounds like the resin is not the problem. It the way the glass and resin were applied. When you put glass on a model the purpose is to add strength and second to give a smooth base for paint. The first rule when you apply glass with epoxy is don't use any more resin than is needed to stick the glass to the surface. The glass provides the strength and the extra resin is just extra weight and actually reduces the strength of the glass cloth. The best method is to wet the surface then apply the cloth to the wet surface. Then add more resin only where there is a dry place or a air bubble in a corner. Then use a paper towel and blot off all the excess resin. The surface should look dull, you should be able to see the weave of the fabric under a strong light. After the resin cures, sand off any rough edges and the second coat of resin is added to give a smooth surface. To do this add a light weight easy to sand filler to the epoxy like WEST SYSTEM MICROLIGHT. Mix it to a peanut butter thickness and spread a thin layer on the model. When it cures the surface will be rough, but it sands very easy and the result is a perfect surface to paint with a minimum of added weight. Matt Gewain Composite Structures Technology At 11:22 AM 9/3/99 -0700, Steve Kerrin wrote: >I've been rebuilding an old 60" sloper and >have run into a problem in glassing the fuse. >I know a vast number of the list members are >into composites and glassing so here is my >question: > >I glassed the fuselage with a layer of 3/4 oz > >glass according to the methods published >recently in MAN as well as other articles by >Jim Ryan and others. > >No problem so far. Everything cured nicely, I > >gave it a light sanding, wiped it down with >methanol and applied a second coat of resin >thinned slightly with methanol (I'm using >Jeffco 1314/3102 as it is on the shelf >locally). Everything flowed out nicely so I >hung it up to cure. Next morning, I checked >it and found that it had beaded-up during >curing. Not droopily beads, but long soft >ridges. Lots of sanding requiredUGH! > >I ran a few experiments on small test >sections with thinned and unthinned resin, >with similar results. I understand that some >finishing resins contain a bit of wax which >could cause such behavior, but this one does >not (according to the supplier). > >Before I go purchase another kind of resin >(seems the most obvious thing to try next) >are there any ideas from the vast knowledge >pool out >there? > >TIA >Steve Kerrin >Escondido, CA > > > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
