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  1. Flivverflyer

    Another Boeing 737 failure.

    So, turns out this particular door hinges outward. I guess I’m not familiar with this design. Trying to figure out how it frees itself from the restraining door stops when opened.
  2. Flivverflyer

    Another Boeing 737 failure.

    So, as a retired Boeing structural design engineer, my first question is "How on earth did that hatch blow out through the cutout without taking all the door stops with it? Granted, I was a Wing Group guy and not a Doors guy, but I saw how these doors go in, and from what I can see in the...
  3. Flivverflyer

    Design at new version of the Fournier Motor Glider

    I just got into a one-third partnership in a SZD-45 Ogar, with a 27:1 L/D and 190fpm sink rate, very close now to getting it airborne. I had a guy tell me he used to fly the Ogar years ago, and wanted to prepare me for disappointment. Note well... he currently flies an immaculate ASG29. When...
  4. Flivverflyer

    Carlisle Turf-Glide tires and tubes

    I use the Carlisle Turf-Glide 8.00-6 tire on my Sky Raider, and needed a new tube when the valve stem got pinched and started to leak at the base. I got this one from Amazon, and it works great. https://www.amazon.com/gp/product/B07FQW5MVL/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
  5. Flivverflyer

    Spar inspection results raise FAA concern

    Carbon and aluminum are on opposite ends of the galvanic spectrum... and the aluminum is the sacrificial element, like a battery. One of my parts on the 777-9 was the landing gear drag brace attach fitting on the carbon rear spar. We were directed to make it out of aluminum rather than the...
  6. Flivverflyer

    Spar inspection results raise FAA concern

    I agree with the above comments, that if the original forging dies are not serviceable, then the next best thing is to machine a part out of bar stock and gage up as necessary to compensate for the inferior internal microstructure. A built-up part made from plate and extruded stock, with...
  7. Flivverflyer

    Spar inspection results raise FAA concern

    At Boeing, we had limits to how thick a machined part made from a die forging could be before the option to hog it out of block was disallowed, due to the coarse, large grain size at the heart of the block or plate. The larger the grain, the lower the mechanical properties, and associated...
  8. Flivverflyer

    Suitable/favorable Reynolds number for an aeroplane wing ?

    Asking what is the 'best' Reynolds number is like asking what is the best airfoil. The answer changes with airspeed, chord length, and air density. When I was flying R/C thermal duration gliders back in the '90s, everyone thought the 'best' airfoil was the SD7037, with some holdouts arguing...
  9. Flivverflyer

    Ultralight biplane flying wing

    Rutan's Solitaire is a case in point, where forcing the canard layout on a high-performance sailplane design ended up with a penalty. For the canard to do its job, the rear wing was at less than optimal angle of attack for maximum lift coefficient, and the pervasive complaint is that the...
  10. Flivverflyer

    Ultralight biplane flying wing

    Since the movable wingtips are the only apparent control system, gotta believe they were intended to be dual purpose, for pitch and yaw/roll, when operated together or differentially. All I know is I would never embark on building one of these contraptions. Seems marginal at best. And with no...
  11. Flivverflyer

    Flaglor Scooter plans

    "My interest in building flagged immediately upon close examination of the plans. Much like many of the early scratch build only homebuilt designs, to my eye, it is built like a tank. Longerons, spars, and just the overall airframe are heavy gauge members." Ah, yes. My conclusion exactly...
  12. Flivverflyer

    An Airplane to Make ‘Em Mad

    Repeat after me.... "Stay off the brakes!"
  13. Flivverflyer

    What are you doing in addition to flying?

    In addition to flying my Sky Raider and the soaring club Schweizers, I build and fly model airplanes-- R/C, gliders, Free-Flight, old timers, etc. Model airplanes are almost as much fun as the full-scale stuff, in my opinion.
  14. Flivverflyer

    Who lets the dogs in?

    I really thought Archie would dig the idea of going flying with me in the back of my Sky Raider, as he goes just about everywhere else with me. But I think he finds it too confining and claustrophobic, even with the windows wide open. When he looks out, all he sees is a vast expanse of...
  15. Flivverflyer

    Tim Lunceford's Centerwing Heath

    I thoroughly enjoyed this video. What an airplane! Comparable to a Minimax in horsepower and overall size, but a totally different beastie. I'd have to drink some fortified testosterone extract to rummy up to this one. Brave men, these racing pilots!
  16. Flivverflyer

    Crashes in the News - Thread

  17. Flivverflyer

    Crashes in the News - Thread

  18. Flivverflyer

    Crashes in the News - Thread

    As a now retired Boeing structural design engineer, I can say a few words about load axis transfer with components in bending. We struggled with it constantly, as my team did a lot of our work in the wing-to-fuselage integration area. Think of two joints: Joint A is a plate bolted up...
  19. Flivverflyer

    Rotax 503 rapid descent-- best throttle setting?

    ...side slip sounds like a good idea... at, like, 5200RPM and 55mph?
  20. Flivverflyer

    Rotax 503 rapid descent-- best throttle setting?

    So the other day I found myself with a lot of excess altitude coming off the Boise hills in my Sky Raider and needing to get down under the Boise Class Charlie shelf (or go way around it). How to descend a thousand feet or more in just a few minutes, without entering the dreaded "lean zone" on...
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