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  1. JimD

    Redundant Receiver Installation

    The first time I tried this was back in the 72MHz days. I put redundant receivers in a scratch built 1.33% enlargement of the Sig Hog Bipe. I thought it was a big airplane at the time (completed build February, 1998). It was converted to 2.4GHz several years ago and continues to look fantastic...
  2. JimD

    How to make scale toggle switches

    This may come under the heading of too much time on your hands... ;) While sitting in the shop "think building" we noticed the pile of pushrod scrap we could not bring ourselves throw away...so we chucked up a short piece of 4-40 in the drill press and got out a file and did a little creative...
  3. JimD

    Make a Custom Header for your Gas Engine

    Figures that a material with a fairly low melting temperature would not hold up under the conditions needed for aircraft exhaust. Too good to be true.
  4. JimD

    Make a Custom Header for your Gas Engine

    Found a picture of the vibration absorbing mounts that we made:
  5. JimD

    Make a Custom Header for your Gas Engine

    I watched a guy selling AlumiWeld at the Toledo Show...he would punch a hole in a soda can and then weld it shut. Looked really easy, but never tried using anything like it. Now you have me thinking...take some empty pop cans, weld a pair together, add inlet and outlet...bingo! Soda canister...
  6. JimD

    Redundant Receiver Installation

    Hey Thurmma, that's great! :too-cool: It may be low tech, but I really like the simplicity of it. This offers a way to get into giant scale without having to learn about power expanders, redundant batteries, and other high tech electronic gadgets. Builder can use what is already on hand and...
  7. JimD

    Make a Custom Header for your Gas Engine

    Is that like AlumiWeld?
  8. JimD

    Redundant Receiver Installation

    When we started flying giant scale airplanes with big (85cc) gas engines and AUW of 40-45lbs, how to decrease the chance for radio failure was on our mind. First, there is the vibration, then there are the large servos and high current demands. Looking for a way to use the equipment I already...
  9. JimD

    Make a Custom Header for your Gas Engine

    The flex section is designed to flex (to correct for slight misalignment issues) but not to continuously flex (as in vibration absorption). The large canister we used with the DA-85 could move around a lot with its single central mount and this allowed the flex section of the header pipe to be...
  10. JimD

    Make a Custom Header for your Gas Engine

    Guys, the cracks were in the pipe its self...not the joint! I may have a picture, let me look... What we did with the canister mount was to make rubber mounts that helped dissipate the vibration. Our header pipe was a solid piece, no flex section. On an earlier version, we only had one mount on...
  11. JimD

    Make a Custom Header for your Gas Engine

    Capt...the joints have held up well over 40 some hours of flight time. We found that supporting the canister at two locations was the key. Another thing we discovered is from full-scale protocol...after towing a large sailplane to altitude, the header pipe is very hot, so don't immediately cut...
  12. JimD

    Make a Custom Header for your Gas Engine

    When we first got into giant scale aero towing, our tow plane of choice was the 3.3M Pilatus Porter from TopModel. With a DA-85 up front, we were able to tow sailplanes up to and including the Bill Hempel 7.5M half-scale KA-6. The only problem was that the DA-85 had a loud growl that was rather...
  13. JimD

    Post pics of your airplane

    Sorry, name is not familiar to me.
  14. JimD

    Post pics of your airplane

    Yes, we have a guy that is into that part of giant scale...I have been working on him and now he has a sailplane and does some aero towing as well. You are welcome to come for a visit, just let me know a date and time. Here is another one of my planes, a TopModel Pilatus Porter with DA-120.
  15. JimD

    Post pics of your airplane

    Pictures were taken at the HighPoint Aviation airfield located on top of Knobley Mountain in West Virginia (about three miles south of Cumberland, Maryland).
  16. JimD

    Post pics of your airplane

    The full-scale, not so much...but the designer of this model hit a home run with his airfoil selection. On the first flight, I was busy thinking about the landing (sailplane, only get one shot) when I realized that I was gaining altitude. After about ten minutes I just couldn't stand the...
  17. JimD

    Post pics of your airplane

    Something a little different...Aviation Concepts 1/4-scale Schweizer SGS 2-33 http://hangtimes.com/aviationconcepts.html
  18. JimD

    MTW 75 Canister Mount

    Here are some pictures of an installation MTW-75K canisters using the plywood mounts from Desert Aircraft mentioned above:
  19. JimD

    MTW 75 Canister Mount

    Sounds like you have the MTW-75k canisters which are shorter (245mm) but larger in diameter (70mm or about 2-3/4"). The regular MTW-75's are 55mm in diameter and 355mm in length. I have used the MTW-75k canisters in several planes and used two of these plywood mounts that Desert Aircraft sells (...
  20. JimD

    Adding a Tow Release to the Hangar 9 Super Decathlon 100cc ARF

    Thanks Sleepy, A couple other things we did...since the covering on the top aft section of the fuselage on our first plane never stayed tight, we stripped off the covering on the top and added 1/8" balsa supports between the dowel rods to keep them from flexing. This has worked great and the...
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