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  1. Y

    angle of fixed pitched rotors?

    Helicopters, with a collective, have a pitch that constantly varies. Gyros have a fixed pitch, but the teetering motion in effect changes the angle of attack. Jim
  2. Y

    angle of fixed pitched rotors?

    Dan writes: "Any fixed-pitch rotor blade will need a steeper pitch near the hub, just as a propeller has" That is true for helicopters, but not for gyros. For a vast amount of info on rotors look at Rotary Wing Forum Jim
  3. Y

    just ordered yamaha 150fi engine

    Ernie Boyette did it: Ernie Boyette flying the Yamanator at Bensen Days 2010 - Rotary Wing Forum
  4. Y

    Homebuilt metal forming tools

    There are plans for a brake here:Brake Plans or click on left side under "tools" to get many other ideas Jim
  5. Y

    Having my own hanger/pole barn built, how much should it cost?

    Google "Barn" or "Pole barn" and you will get many plans for free to choose from
  6. Y

    Having my own hanger/pole barn built, how much should it cost?

    I have just poured a 40x48 floor. Material was about $4000.00 and labour $1600.00. Ask around for quotes, they differ a lot.
  7. Y

    fiberglass and mogas

    Marty is correct: If you doubt, build the tank with vinylester resin. Jim
  8. Y

    Yamaha Genesis Conversion

    Thanks Dave! I wish that I had the knowlege to do it. With turbos one can do much. I do know that the new Yamahas, newer that the ones that they use on the Rotaryforum, have fuel injectors, not carbs. Years ago I used a BMW fuel injected engine. It was the most reliable thing one can...
  9. Y

    Yamaha Genesis Conversion

    Check the thread Yamaha Genesis 120hp engine - Rotary Wing Forum What they did for gyros can be used on FW. Jim
  10. Y

    Anybody have any idea where to get a CriCri kit?

    I have a Zenair plan. 100% complete and still in the box. The construction manual is the best I have ever seen. Photos are available if you want to see them. There is a design fault with the Zenair plans re: the link between the ailerons that is too small and causes flutter. But this can be...
  11. Y

    Yet another new guy! (has anyone ever built a Christavia?)

    I built a Christavia. Here in Canada quite a few are flying. A great plane. The plans are clear and easy to follow. Do it!
  12. Y

    Wingtip drag rudders

    I flew a Mitchell wing with the same kind of drag rudders. In fact, this plane flew for 20 years without any problems. In 2007 I gave the plane it's last major, and everything was 100%. After a very good pre-fight, I took off. I used rudders for turning, for ailerons only are not as effective in...
  13. Y

    forming-bending plexiglass into correct position

    Phil, Shannon is correct. But it all depends what you want to do. If you need to bend single curves, policarbonate will do. I did this on my Christavia with good results. If you need to make one with multiple curves you need to warm it up and form it. There are two ways to do it: Over a form...
  14. Y

    Yamaha 3Cyl. Snowmachine Engine

    This is for the Yamaha four stroke engine. Maybe it will help: Yamaha Genesis 120hp engine - Rotary Wing Forum Jim
  15. Y

    substitute for Spruce/Douglas Fir

    In South Africa some folks used Pinus Radiata and Pinus Eliotii with very good results. These also grow in the southern states, but due to the difference in environment they may or may not work. Jim
  16. Y

    Replacing Alum Tube with 4130 Steel for Fuselage

    Comparing aluminum with steel does not give the whole picture. — It is much more difficult to weld aluminum. (I have TIG welded both) Steel welds are much stronger than in aluminum joints where it is riveted or bolted together. In a well — welded 4130 truss, the weld must be stronger than the...
  17. Y

    horizon 1 vs. christavia

    Maybe you are right, As I said, it was many years ago (around 1985) that I saw first-hand how the Fishers were built. I have a great respect for their geodedic structure, and for these planes in general. In fact: I used geodedics myself in stead of drag/anti-drag wires and my wings are super...
  18. Y

    Who wears a helmet, anyways??

    Helmets: I wear one! --- Especially after my ultralight malfunctioned two years ago and I broke my pelvis, tailbone and four ribs. The helmet had deep gushes but my head was totally intact. (Although my kids do not agree with the last statement!) Jim
  19. Y

    horizon 1 vs. christavia

    Years ago I lived close to the Fisher factory and saw first-hand how they build their airplanes. I also built a Christavia. The two planes are two different categories and hard to compare. Everything in the Horison is to keep weight down. It’s penetration is much lower and it uses a two-stroke...
  20. Y

    Warren Truss Wing?

    Maybe you have the same idea as those folks who use geodedics. (Fisher Flying Products come to mind) Due to this construction no drag and anti-drag wires are used and the wing is very rigid. Jim
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