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  1. mstull

    Re: Stan40353's "Challenge to you all"

    Paul, Right that wing didn't have flaps, and used Junkers style ailerons. It was one of my earlier designs. Most of the ribs on that carbon wing were scrimmed balsa with plywood rib caps. I stopped using carbon when the price of carbon tripled. The wings I'm flying now have flaps and...
  2. mstull

    Re: Stan40353's "Challenge to you all"

    Paul, I mount my wing struts or flying wires to the axle ends all the time. As long as the axles are fixed, large, and well supported (with no suspension), it's an ideal place for strut attachment. The MiniMax and its clones have that. Overall, your plan sounds good. One of my designs had...
  3. mstull

    Registering an ultralight as an LSA

    I would avoid buying the Quicksilver. Why put yourself through that hassle or risk. Buy a registered LSA or legal U/L instead.
  4. mstull

    Need some recomendations

    Yes, your size and weight will limit your options. Many people fly U/Ls that are slightly illegal... maybe a little over the weight limit, a little over the speed limit, and somewhat over the stall speed limit, by using a slightly larger, heavier engine, like a Rotax 447. That should lift your...
  5. mstull

    cuynua 430 thro problems with air filter

    That's great info Richard. I have been using a cheap digital multi-tester set to DC mV for many years like that. An EGT or CHT gauge is really just a millivolt meter with temperature numbers instead of millivolts printed on the dial. The probes tend to break right where the wire starts to...
  6. mstull

    Different Type Of Aircraft Covering

    Right, you want a minimum of resin to optimize the strength to weight ratio. But it is easy to squeegee out too much resin with a hand layup, and end up with a layup that is dry and porous... which loses strength, and the porosity can cause other problems. Vacuum bagging, plastic wrapping, or...
  7. mstull

    Different Type Of Aircraft Covering

    2024 is much stiffer and stronger than 6061. It has a much higher yield strength. It is harder and more brittle. Both make good planes, but you can use thinner walled material with 2024 to get the same stiffness and strength, saving significant weight. I only use 6061 if I need to bend the...
  8. mstull

    Different Type Of Aircraft Covering

    Wet hand layup will come out kinda heavy for spars, even with carbon. Then there's the problem of what kind of mold to use that can be removed from the tubular layup. I doubt you'd be able to make carbon tubing that comes out with a better strength and stiffness to weight ratio as 2024...
  9. mstull

    Different Type Of Aircraft Covering

    SeaEagle, Yes, I switched from carbon to 2024 aluminum several years ago, when the price of carbon tripled. Most guys who buy the 340 Kaw, wish they had gotten the 440. I'd suggest the 440 for your pilot weight. 2024 aluminum costs about 3 times as much as 6061, but is much stiffer and...
  10. mstull

    Different Type Of Aircraft Covering

    Doug, I don't have any more to add about the Got 387 airfoil. It has proven best for U/Ls, but may not have been best for the antique aircraft in that antique report. It is a stall resistant airfoil, owing to its blunt leading edge and thick camber. It has been used successfully for decades...
  11. mstull

    Different Type Of Aircraft Covering

    SeaEagle, Your wing area seems ample to lift all the weight. Any more chord, and it would get pretty inefficient. Also, the greater the chord, the longer the rear fuselage should be, adding weight. And any more span would get real heavy to get enough torsional stiffness out to the tips. I...
  12. mstull

    Different Type Of Aircraft Covering

    SeaEagle, Like you say, weight is a huge deal on an U/L. Your goals of light weight and low cost are fairly contrary to each other. You should pick one to strongly favor. It sounds like you're hoping to market your design. Good luck with that. Customers to want a lot of fun for their...
  13. mstull

    Fuel stabilizer?

    It's not a good idea to run the engine out of fuel... particularly just before storage. As it's running out, it gets lean... of both fuel and oil, which could cause damage from running hot and/or without sufficient lubrication. And it leaves the engine's internals dry so they could rust. It...
  14. mstull

    cuynua 430 thro problems with air filter

    Steve, Yes, it sure sounds like a jetting problem. The foam air filter chokes the carb just enough to make it run too rich... which points to that it's tuned too rich or it's flooding. Make sure the carb's vents are open to the air. I just helped one guy who had connected the two vents with...
  15. mstull

    MoGas Storage

    I've always heard that auto gas starts going stale after a month, and continues to degrade. I know you can put fuel stabilizer in it to keep it from going stale. But I've never seen an STC that says it's okay to put fuel stabilizer in an aircraft's fuel. A friend just got a 500 gallon...
  16. mstull

    Ring Tail

    Thanks Scott, That was probably the largest circulation magazine I've been published in. But the article was pretty worthless. They edited out almost all the technical information, and there were a couple inaccuracies. My next/new plane is designed to have major advantages over others. It...
  17. mstull

    Re: Stan40353's "Challenge to you all"

    I've been using pop-riveted gussets for many years on my U/L designs, with no problems with fatigue. If exposed to enough vibration, the pop-rivets can gradually loosen up. But I've found that spacing the pop-rivets a little closer together will counter that. I use 2024-T3 for all my...
  18. mstull

    Ring Tail

    Rom, The main thing was the added drag of the pilot sitting in the accelerated wind of the prop wash with the tractor engine. All the fuselage frame tubes were also in that accelerated air, making extra drag. The ring tail, with its tubular spokes and tubular trailing edge added drag... and...
  19. mstull

    Ring Tail

    BDD, I'm not ready to reveal any more information about the new design. Rather than answer your question specifically, I will tell you the goals for all my designs: I pride myself in making my designs truly legal in every way. It can be a challenge to make wings that are large enough to...
  20. mstull

    Ring Tail

    My ring tailed, tractor engined U/L is no more. I moved the wings and a smattering of other stuff back to my pusher fuselage that I like much better. It had been so long since I flew the pusher, that I forgot how different it is. The pusher is much faster, and uses less power and RPM. The...
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