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  1. Topaz

    Where are the big wings?

    I'm just being the friendly neighborhood pedant. ;) Your post was spot-on, but the glider pilot in me just couldn't resist.
  2. Topaz

    Buick 215 Trans bolt pattern

    I remember those! My God, has it been that long??? o_O
  3. Topaz

    Where are the big wings?

    The Wright 1901 and especially the 1902 glider would like a word. ;)
  4. Topaz

    Need your opinion/honest advice, old motorglider

    I don't like the look of what appears to be raw and delaminating plywood forward of the stick. That gunk at the bottom of the most-forward bulkhead would be something I'd want to look at a LOT more closely, as well as all the nooks and crannies anywhere near primary structure all over the bottom...
  5. Topaz

    Buick 215 Trans bolt pattern

    Including the Triumph TR-8. My friend has one. And it... <whispers in hushed tones> runs. o_O
  6. Topaz

    Buick 215 Trans bolt pattern

    If that's true, then @PTAirco I may be able to help. What I have is an adapter plate my father engineered to marry a Buick V6 to a Triumph TR-7 transmission. I don't know if I can find the drawings, but I have the article itself. And I'm relatively close. E-mail or DM me if you'd like to take a...
  7. Topaz

    Need your opinion/honest advice, old motorglider

    Interesting. The first two interior images don't give me any pause. Looks relatively clean for its age. The cockpit, however... Here there be tygers. Looks like a lot of moisture has been in there, whether from people's feet or a leaky canopy. On a wooden airplane, that concerns me. Depending...
  8. Topaz

    Discussion: Conceptual Design of an "Inexpensive" Single-Seat Motorglider

    This is spot-on. Especially the last six words. :confused:
  9. Topaz

    Physical Scale Models for Structural Analysis of Composite Acft: Utility? Scaling Factors/Similitude Considerations?

    Bigger question: How many are actually using FEA as opposed to old-school methods? Most of the composite-structure discussions I see here by our local experts reflect spreadsheet versions of various composite structural calculations, not FEA. FEA is so terribly model/meshing dependent that even...
  10. Topaz

    Aeronca L3B

    Hanlon's Razor: "Never attribute to malice that which can adequately be explained by stupidity." The extra frosting for government officials is a gigantic dash of apathy. They literally don't care if you get an outcome. I'm dealing with family law of another sort right now and the bureaucratic...
  11. Topaz

    Today's Sketch

    Every fighter in service starting with the F-16. It can allow for extreme maneuverability - very rapid pitch rates.
  12. Topaz

    Today's Sketch

    You're thinking in terms of an airplane with positive static stability. At low speed (high angle of attack), a positively-stable airplane requires nose-up trim, as you say. But a negatively-stable airplane in the same circumstances requires nose-down trim, because without any trim at all it...
  13. Topaz

    Today's Sketch

    Another way to put it is if this aircraft is at a positive angle of attack, its natural tendency (because of its negative static stability) is to diverge to a higher angle of attack, exactly the opposite of what we're used to with statically stable airplanes. The "trim" required to maintain a...
  14. Topaz

    Airplane For Sale Jurca Sirocco project 1200$

    Shows you how good my attention is today. 🤣 Good luck!
  15. Topaz

    Airplane For Sale Jurca Sirocco project 1200$

    Based on past experience of many projects being sold here, listing at least an OBO price will get you more interest.
  16. Topaz

    Today's Sketch

    It's possible, but not by a lot, and requires careful management of elevator span and wing taper. I've played with (statically stable) flying planks and, IIRC, was able to get the last iteration of the flying plank glider in the album linked up to roughly Cl=1.2. The trick is having the...
  17. Topaz

    Discussion: Conceptual Design of an "Inexpensive" Single-Seat Motorglider

    General simplification. The taper break on a multi-taper wing isn't necessarily at the structural break, and probably won't be. I haven't made a final decision, though. I like the multi-taper, but am almost pathologically averse to scope-creep at this point.
  18. Topaz

    Today's Sketch

    Most of that was still above my level of electronics understanding, where I know the magic electrons go into and out of the magic box through the metal strings somehow, but I think I have the gist of your overall philosophy. And I, for one, am a huge believer in "requirements engineering." ;)
  19. Topaz

    Today's Sketch

    It's like you're almost speaking English. ;) Just finding this thread. Fascinating.
  20. Topaz

    Frequent trailer transport and damage to a wooden motorglider

    That thread is here: Trailer Design - Resources?
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