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  1. raymondbird

    large hole through main spar center section

    Okay thanks again guys! Not as easy as I thought eh. Obviously WW2 fighters had all manner of holes thru the spar for cannons and stuff, but of course, we don't have teams of engineers working for us. The Bell P39 even had giant cooling ducts but it used some sort of steel tube truss center section.
  2. raymondbird

    large hole through main spar center section

    Oh yes, it is bolted to the fuse at two points. Thanks
  3. raymondbird

    large hole through main spar center section

    Need to get air through my center section for rear mounted radiator. As I understand the attached drawing represents the shear load across a one piece wing spar, (zero across the fuselage) so does that mean a large full height hole between the spar caps would be ok? Any knowledge or opinions...
  4. raymondbird

    dihedral break in middle of center section

    Love it! Too bad it didn't get finished. Thanks!
  5. raymondbird

    dihedral break in middle of center section

    Great advice and much appreciated. Will have to poke Jim again as no response to my last email. Hey, is that why the european sailplanes seem to use mostly fiberglass wraps on the webs? I thought it was for toughness.
  6. raymondbird

    dihedral break in middle of center section

    Great stuff guys. Really appreciate all of your expert input and on a final note: I just received Jim Maske's book "Composite Design Manual" and it is excellent. Everything I was wanting to know is in there. Wing design for dummies it could be called. Will be cutting my carbon spar into three...
  7. raymondbird

    dihedral break in middle of center section

    I am going to do just that thanks, and will let you know what he says. BTW, I think I may have found a solution and all wood - the Siers Barracuda, and plans are still available I hope. It's wing spar is 3 piece and surprisingly narrow for the same gross weight that I need. No dihedral in the...
  8. raymondbird

    dihedral break in middle of center section

    Wow, you guys are the absolute best! Such an amazing wealth of knowledge in this group. Hey Will, I was indeed inspired already by the KRSuper2, and even went so far as to get Jim Marske to design a carbon rod replacement for my massive Jurca wood spar. I have it built already too. Only problem...
  9. raymondbird

    dihedral break in middle of center section

    Wheel is about 4" from leading edge of wing when retracted and the depth there is about 6". Main spar is 9" deep at the root
  10. raymondbird

    dihedral break in middle of center section

    Very clever and will have to think about that and talk to an engineer. You are correct too about the original 10" wide spar being the main torsion element. Seems to me after reading all Bilski's posts though, among others, is that this wing would still twist the wrong way when loaded. Spar is...
  11. raymondbird

    dihedral break in middle of center section

    Hey, sounds great thanks. Will see what I can find about that
  12. raymondbird

    dihedral break in middle of center section

    Ya, that's the thought anyway, bolt a metal wing to a wood fuselage. Mainly because I need a three piece wing and that is easier in metal I believe. Will's Corsair/KR2 wood center section looks great too but can it be up-sized for 2500 lb. gross weight . . . ? The other problem with wood is...
  13. raymondbird

    dihedral break in middle of center section

    Very interesting, so instead of vertical, you orient the extrusions flat so that they can follow the curve? How to rivet them to the web though when flat? Cheers
  14. raymondbird

    dihedral break in middle of center section

    Sure can, present design calls for 2 large bolts at the fuselage sides into a massive bulkhead.
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