Recent content by raymondbird

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  1. raymondbird

    engineer help wanted

    So happy to hear from you! Have watched all your videos and am a very great fan. Should I PM you with more details? It is something like a KR2 three piece wing that I have in mind(8' center section) but with overlapping pultruded rod spars instead of wing attach fittings. I have a one piece...
  2. raymondbird

    engineer help wanted

    A tall order isn't it. Can't you just test to a an acceptable load and stop there before damaging anything?
  3. raymondbird

    KR2 style foam wing

    The wing is 24' span, 4' chord average and about 110 sq. ft. Gross weight about 2,000 lbs. NACA 2R1 14% foil so not overly thick. I like solid core as less worry about skin buckling failures. Basically a sandwich the full thickness of the wing. Can't beat that for strength or stiffness seems to...
  4. raymondbird

    KR2 style foam wing

    Thanks! Will see if I can find out more about the Berkut then.
  5. raymondbird

    KR2 style foam wing

    Not sure what you mean here, what could be stronger than a solid core wing? Assuming the correctly sized spar and skins too of course.
  6. raymondbird

    KR2 style foam wing

    Ok, so pour foam is a bad idea, just solid styrene foam then like Rutan and you don't like Mark Langford putting an inside skin in either? No lighter than solid as Billski has told us many times.
  7. raymondbird

    KR2 style foam wing

    Alright, not saying the KR is weak just thinking if you could improve this method for say a 2000 lb. airplane. BTW, how would filling it with 2 lb. foam be making it so heavy anyway? Aren't the Rutan designs solid 2 lb. foam and are they that much heavier?
  8. raymondbird

    KR2 style foam wing

    Just hoping to get any opinions on improving this KR style of glass only on one side of foam construction method. Not being either a sandwich or solid core, it's giving up a tremendous amount of strength and stiffness as per the smartest member on this forum and a few others. I get it that the...
  9. raymondbird

    engineer help wanted

    Looking for help with three piece wing spar(8' center section) design using pultruded carbon rods. Will gladly pay any reasonable fee. Thanks,
  10. raymondbird

    Jurca me109

    Great post thanks! Could debate endlessly on this I know but here is some more good stuff for anybody interested: virtualpilots.fi: 109myths Old Winkle Brown, he wouldn't be a slightly biased Englishman would he. Re: your earlier Italian fighter comment, just want to finish by saying that being...
  11. raymondbird

    Wood type for wood prop?

    Ls2 from a 2005 Corvette with a 2:1 reduction. Still to be determined how well it will spin it. Might have to go to an Ls7
  12. raymondbird

    Wood type for wood prop?

    I used Poplar. Low rpm 2500, but large diameter 88".
  13. raymondbird

    Jurca me109

    Well, I don't see how anyone could argue with the 109 being lighter and mainly because of it's gear design. The loads of the engine mount, landing gear and center section spar are fed to a small area. Any engineer will tell you that's going to be lighter. It seems to me after watching this...
  14. raymondbird

    Jurca me109

    Stating the obvious of course but all aircraft are compromises. The 109's gear gave it advantages too. For example, It would have been heavier with outward retracting gear. Don't forget the Germans didn't have 130+ octane fuel. Being up to 2.000 lbs. lighter than a Mustang made up for that a...
  15. raymondbird

    Jurca me109

    Not true - old myth Off grass the 109 was no more trouble than any other ww2 fighter Have researched this extensively. Will post my sources if your interested . . . ?
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