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  1. J

    What happened to the Star*Kraft SK700?

    Does anyone happen to know if this is still the case? Is the red brick building still there with "Bellance" written on it?
  2. J

    Fowler Flaperons - Bad Idea?

    Thanks for that post - the 'lam aileron' pretty much accomplishes the goal I had in mind.
  3. J

    Spoileron Flight Control Linkage

    Thanks for the info. I wouldn't have expected the down-going spoiler to drop into the wing. I suppose it's much simpler to do it that way, rather than to try and keep it flush with the top of the wing.
  4. J

    Spoileron Flight Control Linkage

    Thanks for your input, TigerTim and Lucrum!
  5. J

    Spoileron Flight Control Linkage

    Can I ask why you prefer conventional ailerons? Do you think they provide better control authority? Better control 'feel', with regards to stick/yoke forces? Thanks for your input.
  6. J

    Spoileron Flight Control Linkage

    Yes, I'd love to hear your input on the flying qualities of the MU2, with regards to the use of spoilerons. The more info you can offer, the better! Thanks!
  7. J

    Spoileron Flight Control Linkage

    After thinking about this a while, I realized you could do away with springs (and increased control forces) using a cam which has push-pull control, like Ducati's desmodromic valve. https://en.wikipedia.org/wiki/Desmodromic_valve That kind of answers my question of one way that you could do it...
  8. J

    Spoileron Flight Control Linkage

    That was my main concern - keeping the spoilers down in all flight regimes. I guess you'd have to determine the maximum suction force you'd possibly encounter, then have a hold-down spring with just enough force to keep it down, but (hopefully) not make control forces too heavy.
  9. J

    Fowler Flaperons - Bad Idea?

    I'm hoping to get some input on whether or not it would be feasible / a good idea to replace conventional ailerons with fowler flaperons in conjunction with spoilerons. Obviously, the motion of the fowler flaperon would be restricted upwards by the wing, explaining the need for the spoilerons...
  10. J

    Spoileron Flight Control Linkage

    Could I ask which planes you've flown with spoilerons? Just out of curiosity. I'm not defending their use. Was just curious about the control mechanics. Thanks for your input
  11. J

    Spoileron Flight Control Linkage

    Lynn, That helps. Sounds like a delightfully simple way to do it.
  12. J

    Spoileron Flight Control Linkage

    To clarify, I'm not asking about how spoilerons work aerodynamically. Rather, I'm curious to know how the mechanical control linkages work. Left and right ailerons are mechanically linked by the same rod/cable - when you lift one aileron, the other travels downward. What is a 'typical'...
  13. J

    Spoileron Flight Control Linkage

    Could someone help me understand how single-direction flight controls (e.g. spoilerons) work? For example, how can the aileron and spoileron of a Socata TBM be mechanically linked, but the aileron has +/- travel, whereas the spoileron only has + travel?
  14. J

    Westlake 2 Stroke Opposed Piston Diesel

    The Achates data I linked above are extrapolations from single cylinder experimental data. So they should be accurate, with regards to the relationships between BSFC, HP, and RPM. Obviously doesn't mean you can make a successful aero engine though.
  15. J

    Westlake 2 Stroke Opposed Piston Diesel

    I'll add to my list above that Achates has good data here, for their 4.9L, 3cyl engine: - 4.9L, 2,200rpm, 270 hp, 640 ft*lb, 0.31lb/hp*h BSFC No weight listed - maybe it's 1,000lb? :)
  16. J

    Westlake 2 Stroke Opposed Piston Diesel

    Do they have a common failure mode inherent to aero diesels? Or is it because they're initial models with kinks to be worked out?
  17. J

    Rutan Ski-gull

    I'm no expert, but I was under the impression that the Navy lost all interest in hydroski/hydrofoil research once aircraft carriers for jet-powered aircraft came into being? I think the Navy was the primary funding source for these projects.This video says the sponsors that came to observe...
  18. J

    Westlake 2 Stroke Opposed Piston Diesel

    Which have shown poor durability?
  19. J

    Westlake 2 Stroke Opposed Piston Diesel

    Do you know why larger engines benefit BSFC? - According to specs on DeltaHawk's webpage, BSFC is .465 at 180hp and .42 at 135hp. - The 100hp Gemini claims 4gph. I don't know what power setting. If 100hp, that's .28, if 75hp, that's 0.38. - Achates data shows roughly .35 at 70hp/2500rpm for...
  20. J

    Westlake 2 Stroke Opposed Piston Diesel

    Yes, thanks for catching that. According to Wikipedia, the 1931 Junkers OP 2 stroke diesel had a BSFC of .345. The much more recent designs on that list come in around .25-.26. Granted, they're enormous container ship engines. Still 2 stroke OP diesels though. Whether or not those numbers are...
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