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  1. wsimpso1

    Hole edge clearance question

    It sounds like it ought to be fairly robust to begin with. I will let folks with direct experience on this mount talk to us. The favorite approach is the empirical one. What have other folks done, and how many hours have their brackets run? The usual issue is crack generation starting from...
  2. wsimpso1

    Torsion Spring Landing Gear

    Ah, aligned axially like a Chrysler product from the 1970's. Issues are several fold. In cars, the torsion bars aligned this way are tied into structures that are already designed around enough stiffness (plenty strong) and so add little weight penalty to surrounding structures. Try this with a...
  3. wsimpso1

    Torsion Spring Landing Gear

    I am a real man, and I have not had a PBR in 40 years. Got Shiner Bock and Bass Ale and Killians in the fridge right now. Come on over!
  4. wsimpso1

    Load Test Question

    Two things leap out at me. First, the spanwise stiffeners shown in the nice FEA plots may be the wrong type of stiffening. I suspect that a somewhat beefy end rib and a closely spaced rib or two between the end and the next full rib stabilizes the skin and facilitate transfer of loads from the...
  5. wsimpso1

    Load Test Question

    Usually, I am the one pointing out that we generally have to funnel all of the bending and shear to the spar when we approach a connection point between wing panels. Ok, some airplanes rivet in a flange on the skins to connect them across a joint. Anyway, yes, the skin contribution to carrying...
  6. wsimpso1

    Raptor Composite Aircraft

    I don't get it. 37 plus years an engineer. My judgement on who to hire and who not to hire usually panned out. My shoes usually laced up. I know it ruins a joke to have to explain it, but this engineer needs this joke explained... Billski
  7. wsimpso1

    Load Test Question

    Hmm, tdfsks is doing a lot of professional engineering services for free here. I would say you owe him at least a bottle of good scotch over all this ... I reviewed his calcs and they look correct. They do make the assumption that when the skin gets to buckling, we lose the contribution from...
  8. wsimpso1

    Torsion Spring Landing Gear

    I think you mean Heinkel 222... While that bird did use a torsion bar spring set up, I suspect it was used there for a combination of reasons. Let's check some thinking. Going to the spring design chapter of Shigley or other spring industry design guides, you will find that the biggest part...
  9. wsimpso1

    Load Test Question

    Hmm, critical loads or stresses for buckling and panel stresses go with the inverse of span squared. A span 3 times longer means critical load is 1/9 as big... more reason to believe that you need those false ribs or some other sort of stiffener. Billski
  10. wsimpso1

    LS-3 Powered Velocity

    The thread started with rv6ejguy telling us this guy is running an LS3 in a Velocity. Rv6ejguy is the proprietor at SDS and that is an SDS programmer in the panel. Cool stuff. Corsair engine kit? Sounds like the owner is integrating it all himself. All this other stuff about GM and aftermarket...
  11. wsimpso1

    Load Test Question

    I just went back through this thread. First, this cambered wing form does tend to make a non-symmetric foil even before the skin in compression buckles. Much of the cross sectional area of the wing is below the centerline of an even symmetric spar, which moves the neutral axis and influences...
  12. wsimpso1

    Load Test Question

    Tough to feature that in my thinking. Usually, you start with the assumption that all of the structure is tied together, contributes to bending and torsional strength, moves together under load, etc. Adjust sizes of parts until My/I is safe. Then check for buckling and crippling. If a cap or...
  13. wsimpso1

    Re-Drive designs

    Welcome aboard. When ever you think that a topic might be interesting if we had it, you should hit the Advanced Search tool and find out if we have already talked oor to death. There is currently an active thread (last posted on yesterday) on the topic. When I searched on "CVT" I found ten...
  14. wsimpso1

    Planning to construct a good composite curing oven...request some feedback/input

    On a hot day, wrapping it loosely in black visqueen and putting it outside can work pretty well too. I use Gougeon ProSet and Jan Gougeon recommended that technique to me personally for their resin. He thought that it worked best if you have completed all of the bonding of the assembly before...
  15. wsimpso1

    Elevator balancing for tube and fabric tail

    OK, first, an airplane design book may not be the way to go. And the full Bachelor's degree educate people in way more than just this topic. Electrical circuits and thermodynamics and fluids and it goes on and on. Way more than you need for this if you have an engineer to check your work as you...
  16. wsimpso1

    Elevator balancing for tube and fabric tail

    The current tail boom runs from the front of the airplane all the way to the tail. And it is flexing at too much of an angle even as it comes out of the brackets. My guess is that the tube is near strength limits with the current tail size and arm. To make the tail bigger and the arm longer, he...
  17. wsimpso1

    CVT belt for Reduction Drive

    It was kind of talked to death. And the folks proposing stuff were not doing their homework, so it stopped. Your Rolling gadget with a CVT allows you to play with whatever prop you get, spin the prop at whatever speed the engine power will turn it, and then take data...cool.
  18. wsimpso1

    CVT belt for Reduction Drive

    I have not looked at this thread lately. Yeah, you might overdrive the prop and make it work. I get tired of doing other folks' work when they start "what-if"ing when they should actually run some example numbers and then make their case... same deal here. Folks are asserting this will work...
  19. wsimpso1

    Scrappy’s Landing Gear Wings - Yay or Nay?

    Well it was figured out back during The Great War that aerodynamically wings should lift, the tailplanes should pull, and everything else should have minimum drag. Usually that was because the induced drag was huge on low aspect ratio surfaces. I would hope that at worst these things would just...
  20. wsimpso1

    Borescope recommendations - Looking at mid time engines

    Actually a compound question. Grin.
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