[RCSE] Airtronics Sagitta 600 for sale
For you folks who contacted me about obtaining pictures of the Sagitta 600 (and, there were several of you) I am offering for sale, I have prepared a web paged for your perusal. Please refer to: http://dozone.net/SAG600DOC.htm where you will find some documentation as well as a slideshow containing many shots of the ship. Thank you for your interest. D. O. Darnell ** World's Smallest Airtronics Dealer ** http://www.dozone.net/airtronics_equipment.htm
Re: [RCSE] shrinkable polyesters
The typical mylar we use for bagging is not designed for controlled shrinkability. Which begs the question of whether there exists a product out there that could function as a heat shrinkable, thick, mylar-like product. ... I can envision, for instance, a mylar-like film of 0.030 or 0.050 in thick in a restraining frame of light wood or metal. Cut a series of airfoil profiles into foam and ... pull a vacuum on... You should have a mold of mylar ... then simply lay-up molded wings... How about a specific clue as to what you are trying to do You've got the idea. If the mylar could be pre-formed then we could use less vacuum which would result in slightly lighter wings in cases where voids in the foam are present (these may now have to be filled). It would also compound curves, e.g. more dihedral, to be built in and could improve leading edges and tips. As you probably know, tips are a particular problem for bagged wings because, when they are pleasantly shaped in plan, they acquire a WAG airfoil. It might also be nice to take the mylar all the way round the core for single taper wings. So it would need to be shaped like a taco. The leading edge would finish up totally smooth. Really neat for stabs. Jeb. __ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.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.
[RCSE] July Contest in NEVADA
Only 29 days left to enter the First Annual? Thermal Duration Contest being held by the Sierra Silent Soarers of Northern Nevada. Check out the web site @:www.sierrasilentsoarers.com/gs/ Great photos of the contest site and all information including entry form. $5.00 of each entry will go into a CASH raffle??? see site for detailsLeeCox-Nevada, U.S.A. [EMAIL PROTECTED] Do you Yahoo!? Free online calendar with sync to Outlook(TM).
[RCSE] SPRING FLING CONTEST IN SACRAMENTO CA. JUNE 2122
For all of you attending the spring fling contest I would like to remind you we will be having a few other events as well. On Saturday and Sunday morning ( early ) High-Torque Motors will be sponsoring a Electric Pylon - Limbo race. That's right Pylon and Limbo, So bring out you nicest and most special electric plane to enter :-). Or steal one from your flying buddy. Most exciting flight wins. On Saturday afternoon we can also put on a small hand launch contest if their is a enough interest. Come by the High-Torque booth to enter the Limo-Pylon race or you can also contact me by email. Entry is free and limited to 2 per frequency !!! and you could win a High- Torque Motor or more? Send me a email with your name, frequency, and whether your interested in Pylon-Limbo, Handlaunch, or both. Craig D. Allen LSF111 [EMAIL PROTECTED] www.high-torque.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.
[RCSE] Posting Contest Results,,,HEY CD's!!!!
Guys you know that when you READ contest results you are looking for two things in this order 1 scores of friends 2 the PLANES that were flown TD Competition (all sailplane comps for that matter) are a TEAM sport The Team consists of the pilot and his partner...you know the one that does half the work. His Sailplane. Going down the list, most guys on the RCSE won't recognize the pilots, but they will recognize the sailplane they may have been considering for their next 'partnership'. So how about it, if you are going to post any sailplane results...DS, TD, F3J, F3D, DHLG, F3F, Speed Records.what ever! Post both partners...please. Gordy Waiting for the sun in Louisville
[RCSE] Latest news about flying with the Sportube
I have been flying non stop with My Compulsion in the Sportube and none of the airlines gave me any crap. Friday morning I flew AA to St Louis...no questions. Today I show up at St Louis and I get crap about it being oversize and how strict they are at St Louis about over size ...63" is the limit sir and while we realize you have been getting away without being charged the $80 oversize fee, you aren't this time. They had me, I couldn't leave my stuff there in St Louis, and if you miss a flight they knock you $100. I'll be raging them via a complaint form lot of good that will do So it looks like another reason to go to three piece wingsyou can keep the snowboard tube under the limit. This is probably a fluke of this airport, so don't over react. I had it happen once before in New Orleans. Bummering. Gordy
[RCSE] ICON For Sale
ICON for sale. Excellent condition. Winner of 2002 Mid South. $1600 ready to fly. [EMAIL PROTECTED]
[RCSE] Paging (Antenna) Jim Thomas
Jim, If you have a chance, will you please contact me off-list? Woody _ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail 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.
Re: [RCSE] shrinkable polyesters
Maybe you should see how 3M window tint films for cars is aplyed and pre-shrinked to the shape of the back windows. First methode is dry using i.ex. Baby Powder. The second method is wet, using sope water. You heat the film in cirkular motion then squeege it to shrink and shape. With Best Regards Czeslaw Dabrowski - Original Message - From: Bill Johns [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, June 02, 2003 5:52 PM Subject: [RCSE] shrinkable polyesters (reposted as the original seems to have been lost in the ether) At 09:12 AM 6/1/2003 -0700, Jeb wrote: --- Bill Johns [EMAIL PROTECTED] wrote: Most all the heat shrinkables are polyesters. But are the polyesters all heat-shrinkables? Yes and no. Yes in that many non cross-linked polymers will go through all sorts of heat distortion often resulting in a smaller dimension but No in that the shrinking process might not be useful for any meaningful applications. (It's an entropy driven process. Sorta like what happens to money, polymer chains want to randomize their organization, heat gives them the energy to do so. Money wants to randomize and sailplanes and digital servos provides the energy to allow that to happen.I bet many of you never thought you'd have to worry about entropy since your physics or chemistry classes, huh. ;-) ) The one of special interest to RCSE is that used for vacuum bagging. It's 0.014 thick and fairly stiff, so it's got a will of its own. My attempts to form or shrink it with heat have failed because it just curls up as a mess. Phil Barnes got similar results. That curling up into a mess is a shrinking process. It's just not shrinking in a manner that is useful or controllable. Consider the films we cover built-up wings with. We tack the corners with the hot iron, tack it all around the edges and then having locked the perimeter down, we start working on the middle sections. Curling up into a mess is not possible as the frame restrains the film holding it flat. A piece of monocote that is not restrained shrivels up as it shrinks. Maybe you need to restrain the perimeter before you try to induce some sort of heat distortion. Any thoughts? Maybe the tensile stresses are just too big to manage with a film that thick. The chemistry of the particular polyester and way the stuff is manufactured (As I understand it and this is not an area of expertise for me) is important in making it shrinkable in a manner that can be used as a design feature. The typical mylar we use for bagging is not designed for controlled shrinkability. Which begs the question of whether there exists a product out there that could function as a heat shrinkable, thick, mylar-like product. My gut reaction is there is something out there, we just don't know where to find these products or what questions to ask. I can envision, for instance, a mylar-like film of 0.030 or 0.050 in thick in a restraining frame of light wood or metal. Cut a series of female airfoil profiles into foam and lay the cores aside. Assemble the various female sections into a wing planform section and then over this locate the thick, restrained mylar. Then, and this might be the key, lay a film of a very compliant but tough film that you can pull a vacuum on. Are you following this? Start pulling a vacuum gently and then heat the assembly up so that the thick mylar-like film distorts but does not shrivel up into a mess but rather conforms to the foam producing a female wing mold. The vacuum would allow the mylar to conform exactly to the foam. After a nice match of mylar-to-foam is made, cool the whole thing down and remove the tough compliant layer. You should have a mold of mylar in the exact shape of the foam that would allow you to then simply lay-up molded wings using the foam + mylar-like film as the mold. I don't think it would last for 100's of wings like the machined aluminum molds, but it would be nice a smooth and you might get 10+ wings out of it and it wouldn't cost a fortune to replace or change airfoils. I know that the tough, compliant, heat resistant films exist. Many bagging composite supplier have this product made of either silicone rubber or urethane rubber. Not cheap, but is it available. Other materials might works as well The only thing I don't know of is the relative heat distortion temperature of the foam you'd cut the female airfoil profile from relative to the heat distortion temperature of the mylar-like material. It might be that the mylar we use would work against a heat-cuttable foam, if not there are probably acetates or acrylates that would be suitable as a thin, heat distortable film. I think you'd want to use a thick film because it will have to conform to the foam wing and will get thinner in areas of high distortion or stretch. Also a thicker mylar would last longer. All solvable problems I suspect. How about
Re: [RCSE] shrinkable polyesters
I heard years ago that the heat-shrinkable films were bi-directionally stretched during manufacturing. When you apply heat, they want to return to their original dimensions, which is where the massive amount of shrink comes from. Without this pre-stretching, they would not shrink as much. Don Stackhouse @ DJ Aerotech [EMAIL PROTECTED] http://www.djaerotech.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.
[RCSE] Tail volume coefficient....
A few years ago, someone gave me a real clear answer on how to size the tail on a RES floater type plane with dihedral. I believe that the calculations were titled tail volume coefficient It went something like: Vertical Stabilizer+Rudder area * moment arm (from CG ?) / (wing area* span) == some range Same basic formula for Horizontal stabilizer and elevator only it did not account for span just wing area There were subtle differences between the two formulas Could someone please re-enlighten me? Specifically I'd like to know: Formula for Horizontal Stabilizer coefficient. Formula to Vertical stabilizer coefficent. Reasonable range(s) for a slow floater type aircraft. Thanks in advance. Paul 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.
