RE: [RCSE] Tripping modern airfoils, and why do flaps and spoilers do what they do?
Scott - I won't answer your question about "tripping" or "turbulating" an airfoil because it really is horribly complex and situation-dependant. Here's some info in the "Aerodynamics" section of Dr. Martin Hepperle's site: http://www.mh-aerotools.de/airfoils/index.htm However, I *will* (in my own novice way) attempt to explain why the nose of the plane changes pitch when you activate spoilers or flaps: Remember that your airplane has two "centers", the center of gravity and the center of lift (or effort). One is the theoretical "balance point" for downward forces on the plane; the other is for the theoretical "balance point" of upward forces on the plane from the wing's lift (which passes through the "center of pressure" of the airfoil). See these links for more detail on this: http://www.grc.nasa.gov/WWW/K-12/airplane/trim.html http://www.grc.nasa.gov/WWW/K-12/airplane/cp.html http://www.allstar.fiu.edu/aero/Wing31.htm http://en.wikipedia.org/wiki/Center_of_pressure http://142.26.194.131/aerodynamics1/Basics/Page2.html (currently offline, but excellent) These two opposing forces rarely line up; and often the tail surfaces are used to counteract any pitching moment that the airfoil produces as it flies through the air and generates lift. Changing the camber (the curvature) of the wing surface changes the center of pressure and possibly the "effective" angle of attack relative to the oncoming airstream (think about an imaginary line running between the trailing edge of the wing and the leading edge. Now drop the flaps - see how the angle of this imaginary line has changed?). Since the center of gravity DOESN'T change, the distance between the CG and the center of pressure/effortmight change and the pitching moments and forces may all change. It is these changes that must then be counteracted by changing the tail-surface deflection. Hope this makes things more clear - the web links are really great sources of info! Take care, --Noel
[RCSE] OVSS #7 - SOAR Fred Fredrickson Memorial Thermal Challenge The Fred
SOAR will be hosting our 8th annual Fred Fredrickson Memorial Thermal Challenge and 2005's OVSS #7 at our sod farm field near Plainfield Illinois this coming weekend Sept 17 18. Long flight times, FAI landing bonus, seeded man-on-man ... and no skegs or landing arrestors! For details, http://www.silentflight.org/LSF_Base/SOARFred.html or from the link http://www.silentflight.org/LSF_Base/events.htm We look forward to seeing your here. tk P.S. One additional perk, Jim and Rhonda Bacus will be hosting a bbq at their home Saturday night, details will be available at the field. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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] Wetting carbon tow ... a solution ?
Hi Guys to add a little more to this thread I did a little more research on the net, talked to a number of suppliers here in Australia and have come up with a design for a machine to wet out the tows. It will consist of a vertical length of PVC tube of 35mm dia. closed at the bottom with a nylon plug that has been turned to have a taper in the top surface reducing down to a hole just big enough to pass the tow through it with some drag. This pot is filled with resin with the tow passing down through the hole. The tow with its small clearance to the hole will stop the resin running out. The tows would be fully wet out when they are squeezed through the hole in the bottom of the pot.Below this is a pair of rollers that are spring loaded together. The tow as it passes through these rollers has any excess resin wiped off the outside of the tow which drips into another container underneath. This assembly is mounted in a wooden frame and clamped to the bench so that lengths of tow can be pulled through and laid onto plastic on the bench. The tows would be covered with absorbent paper and rolled to get any excess resin out before being placed into the spar jig. It has been suggested that if there was a low pressure supply of air directed at the tow just before it enters the pot of resin the fibres within the tow would be separated a little and would pick up the resin better. I've started to construct this set up today and have made the resin container and part of the support frame. I'm going to try pulling the tow through the pot of resin tonight to see if the inside of the tow is fully wet out. The biggest problem that I see is the cleaning of all the machine after wetting the tows, Obviously the machine will have to be easily disassembled to do this Any comments or suggestions before I go too far ?? Eddie the Eagle in sunny South Australia 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] The right servo for spoilers
-Original Message- From: Daryl Perkins [mailto:[EMAIL PROTECTED] Ok... ok... ok OK. I can't resist. ;-) If you want weaker... slower... heavier... larger... and more expensive I'd use the JR 368. ;-) Otherwise, the new Airtronics digital would be a good choice... 94761. Probably more power than you need though I'm sorry, John these guys are killin' me I just couldn't take it ;-) D Hey Daryl, You a funny guy! You can return all your inferior JR servos to me at Visalia. 8^) See ya in a few weeks. BTW-Pay no attention to the servos in the RES plane I'll be flying there! Late, JD 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] Retro winch
http://nakotne.com/e107_plugins/kig_menu/index.php?view=imageimageId=795 The engine is from old Russian chainsaw Druzhba (Friendship). regards, Arne 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] Level V task completed
Congratulations Paul, nice to see your LSF level looking more representative of your flying skills. Lift, 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] Ava for sail
I'll have my competition proven (grin)Ava for sail next weekend here at the Tullahoma contest. Won 2nd at the Nats, won over all here in Tullahoma, and won the overall at The Gateway open in St. Louis in July. $600 cash and carry for all but my PCM receiver. Sorry no out of town delivery or shipping. I want any prospective buyer to look/fly it first. Thanks. Brian Smith [EMAIL PROTECTED] 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] Long music wire????
Anyone have a good source for 48 or longer 1/16 straight music wire for pushrods? I have a couple of projects that 36 wire is not going to get it. Thanks, Shawn 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] SAGE (Tucson) Annual Fall Contest Announcement
Southern Arizona Gliders and Electrics (SAGE) in Tucson, Arizona has announced the Annual Fall Contest for November 6, 2005 (Saturday). Check out details here - http://www.rcgroups.com/forums/showthread.php?t=415395 Tracy Castell Waterworks Sales Manager Ferguson Waterworks - Arizona (520) 940-0354 [EMAIL PROTECTED] or [EMAIL PROTECTED]
Re: [RCSE] Long music wire????
Hi Shawn, I don't think anyone has long music wire... Try a weld shop. I have used weldingwire. normally a weld shop will give you 15 feet or so. it comes in different diameters and is not hard to straighten out enough to work. I have used it on a couple of different planes. LEElenci1938e [EMAIL PROTECTED] wrote: Anyone have a good source for 48" or longer 1/16" straight music wire for pushrods? I have a couple of projects that 36" wire is not going to get it.Thanks,ShawnLeeCox-Nevada, U.S.A. [EMAIL PROTECTED]__Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
RE: [RCSE] Long music wire????
I tried a music store, and they seemed willing to help - it was very busy, and I had to leave, but they acted as thought they had spools of wire for the pianos Maybe?Good luck, Brent
[RCSE] Contest Announcement: 2005 Texas National Tournament, TNT 2005
The Soaring League of North Texas is hosting the 21st annual Texas National Tournament, TNT 2005. The event will be held at the world famous Southfork Ranch on the north side of Dallas on October 7-8-9. Contests are as follow: Friday, October 7: Hand Launch and RES Saturday, October 8: Unlimited Sailplane Sunday, October 9: Unlimited Sailplane Complete information including entry form may be obtained at http://www.slnt.org/TNT%202005/2005%20TNT%20Complete%20Package.pdf Please note that pre-registration by September 28 is highly recommended as the entries per frequency will be limited to make the event flow smother for the contestants. Please direct inquries to: Henry Bostick, Contest Director email address [EMAIL PROTECTED] 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] Long music wire????
Try Mcmaster carr too. They have coils.. The question is how tightly wrapped is the coil... Very reasonably priced. http://www.mcmaster.com/nav/Framework.asp?ReqTyp=CATALOGCtlgPgNbr=3462CtlgEdition=111fam=steelppe=27ppr=1psm=2psl=3; lenci1938e wrote: Anyone have a good source for 48 or longer 1/16 straight music wire for pushrods? I have a couple of projects that 36 wire is not going to get it. Thanks, Shawn 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 -- Jeff Steifel 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] Long music wire????
Try www.smallparts.com I got 30' of .018 wire for DLG pushrods. Comes wrapped up in a 4 coil. 800 220-4242 JE -- Erickson Architects John R. Erickson, AIA From: Lee Cox [EMAIL PROTECTED] Date: Mon, 12 Sep 2005 10:17:45 -0700 (PDT) To: lenci1938e [EMAIL PROTECTED] Cc: soaring mail page soaring@airage.com Subject: Re: [RCSE] Long music wire Hi Shawn, I don't think anyone has long music wire... Try a weld shop. I have used welding wire. normally a weld shop will give you 15 feet or so. it comes in different diameters and is not hard to straighten out enough to work. I have used it on a couple of different planes. LEE lenci1938e [EMAIL PROTECTED] wrote: Anyone have a good source for 48 or longer 1/16 straight music wire for pushrods? I have a couple of projects that 36 wire is not going to get it. Thanks, Shawn LeeCox-Nevada, U.S.A. [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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] Long music wire????
Title: RE: [RCSE] Long music wire If you don't have to make bends, carbon-fiber rods work great, are lighter, and can be had in 4 and 8 foot lengths: http://www.acp-composites.com/acp-cr.htm Matt -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of lenci1938e Sent: Monday, September 12, 2005 12:57 AM To: soaring@airage.com Subject: [RCSE] Long music wire Anyone have a good source for 48 or longer 1/16 straight music wire for pushrods? I have a couple of projects that 36 wire is not going to get it. Thanks, Shawn 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] Long music wire????
You can get long music wire from www.smallparts.com, or from any piano tuner. I got a huge roll from an on-line piano parts company, a lifetime supply for sixteen bucks if I recall right. I later found it was easier to get stainless-steel leader wire from Bass Pro Shop. It's not as stiff as music wire, but works fine for pushrods. 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] Long music wire????
Bill, This is .018 wire for a DLG. You can practically tie it in a knot. It needs a housing to take shape. The curve from the coil goes away as soon as the push rod is in the housing. JE -- Erickson Architects John R. Erickson, AIA From: Bill Swingle [EMAIL PROTECTED] Reply-To: Bill Swingle [EMAIL PROTECTED] Date: Mon, 12 Sep 2005 14:04:26 -0700 To: John Erickson [EMAIL PROTECTED] Cc: Soaring List soaring@airage.com Subject: Re: [RCSE] Long music wire A 4 coil? Isn't that hard to straighten? Bill Swingle 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] Retro winch
That's great! ROTFL At 10:07 AM 9/12/2005, Arne Ansper wrote: http://nakotne.com/e107_plugins/kig_menu/index.php?view=imageimageId=795 The engine is from old Russian chainsaw Druzhba (Friendship). regards, Arne 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] FS: NIB FS01 Compulsion
Previous sale fell through. FS01 Compulsion NIB is still available. $600. Please contact me off line. Cheers, Bill 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] Retro winch
Where's the pedal? 8-) At 06:38 PM 9/12/2005, S Meyer wrote: That's great! ROTFL At 10:07 AM 9/12/2005, Arne Ansper wrote: http://nakotne.com/e107_plugins/kig_menu/index.php?view=imageimageId=795 The engine is from old Russian chainsaw Druzhba (Friendship). regards, Arne Jim Downers Grove, IL Member of the Chicago SOAR club, and Team JR AMA 592537LSF 7560 Level IV R/C Soaring blog at www.jimbacus.net 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] Retro winch
Jim, It's the "Darwin Award" equivalent for true F3B and F3J pilots in Europe. The "Gorilla" and Flywheel winches were descendants. Somehow, someone made it through their first launch. Chris Original Message Subject: Re: [RCSE] Retro winchFrom: "James V. Bacus" [EMAIL PROTECTED]Date: Mon, September 12, 2005 4:44 pmTo: soaring@airage.comWhere's the pedal? 8-)At 06:38 PM 9/12/2005, S Meyer wrote:That's great! ROTFLAt 10:07 AM 9/12/2005, Arne Ansper wrote:http://nakotne.com/e107_plugins/kig_menu/index.php?view=imageimageId=795The engine is from old Russian chainsaw "Druzhba" (Friendship).regards,ArneJimDowners Grove, ILMember of the Chicago SOAR club, and Team JRAMA 592537 LSF 7560 Level IV R/C Soaring blog at www.jimbacus.netRCSE-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] Retro winch
Some how I have a hard time with the image of chainsaw and Friendship in the same sentence. Things more like massacre come to mind. Randy - Original Message - The engine is from old Russian chainsaw Druzhba (Friendship). 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] Retro winch
At 18:07 12/09/2005 +0300, you wrote: http://nakotne.com/e107_plugins/kig_menu/index.php?view=imageimageId=795 The engine is from old Russian chainsaw Druzhba (Friendship). regards, Arne I can remember back in about '78 that there was a couple of winches using motors like that. They had a centrifugal clutch so that the motor was idling and when you wanted to launch you rev'd the engine and it wound in the line. They were banned quite quickly because of the noise that they made you couldn't hear the start of working time. The Eagle 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] Wetting carbon tow ... a solution ?
At 14:27 12/09/2005 -0500, you wrote: Eddie, this sounds very professional. I'd like to see a photo of it when you get through with the tool and I'd like to know if it worked as planned/ George Voss We can't send photos to the group but I can certainly send anyone who's interested a photo when it's completed I'll let you know when it's completed. The Eagle 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] Retro winch
Back in that same time period we had a guy bring out a gas winch with an old Briggs Stratton engine on it... The solution was a little sugar. ;-) Norm PBSS Snip I can remember back in about '78 that there was a couple of winches using motors like that. They were banned quite quickly because of the noise that they made you couldn't hear the start of working time. The Eagle RCSE- 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] Retro winch
Isn't that JUST what you need to attract the younger crowd to soaring? Listen to the deafening roar of the engines on the starting line as the seconds count down the working time! See the lights flash on the christmas tree - red - yellow - GREEN! They're OFF! [EMAIL PROTECTED] -Original Message- From: Norman E. Timbs, Jr. [mailto:[EMAIL PROTECTED] Sent: Monday, September 12, 2005 4:17 PM To: 'Eddie Smith'; soaring@airage.com Subject: RE: [RCSE] Retro winch Back in that same time period we had a guy bring out a gas winch with an old Briggs Stratton engine on it... The solution was a little sugar. ;-) Norm PBSS Snip I can remember back in about '78 that there was a couple of winches using motors like that. They were banned quite quickly because of the noise that they made you couldn't hear the start of working time. The Eagle RCSE- 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
[RCSE] Multi-Chemistry Charger...Sort Of
I know some of you like to tinker. Essentially the following evaluation boards/IC's/support hardware would allow someone to build their own multi-chemistry charging system which I geared towards Li-xx technology, and also monitor electronically the rate of (gain/loss) energy consumption (gas gauge) with the following evaluation modules: Benchmarq components: 1 of DV2000S1 and DV2000TS1 Multi-Chemistry Switching Charger Development System 1 of DV2954S1L Li-ion Charger Development System 1 of BQ2050HEVM Evaluation Kit (Power Gauge/Gas Gauge) 1 of EV2200 PC Interface Board for Gas Gauge Evaluation (includes serial cable and software) 5 of BQ2000SN-B5 Charge Management System IC's (8-SOIC pkg) Total package contents well in excess of $300USD, asking $150 (or make me a reasonable offer). -- Simon Van Leeuwen RADIUS SYSTEMS PnP SYSTEMS - The E-Harness of Choice Cogito Ergo Zooom 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
