Gavin & Colin,
Colin is correct about starting the Dihedral at BL0.0
as opposed to starting the dihedral somewhere
outboard.
I'm not a loads engineer, but I did a "sanity " check
with one here at work.
Here are some issues that you may encounter by
starting the dihedral at BL0.0:
1.)Kick Loads. How do you handle the additional kick
loads? obviously you must make the spar larger in both
height and width.
2.)Landing gear attachment. If you are or plan to use
the Diehl gear, you are faced with 2 choices:
a.) use a smaller prop
b.) Make the spar taller
3.) Wing Fillets. Wing fillets are always larger and
more complex for a BL0.0 dihedral as opposed to a
straight spar/wing
4.)Spar / Wing to fuselage attachment complexity. The
dihedral really complicates this attachment scenario.
5.) Occupant packaging. KR pilots and passengers are
seated between the spars, with the occupant knees
directly over the front spar. Having the wing
dihedral start at BL0.0, causes occupant packaging
issues. Do you think you will be comfortable as a
pilot with the outbd knee higher than the inbd knee?
So to answer Gavin's question, yes, there are plenty
of low wing aircraft with the dihedral starting at the
center. There are far and above many more examples of
low wing aircraft where the dihedral starts outbd of
the center, reasons for which are stated above.
Good luck and happy building!
=====
Scott Cable
KR-2S # 735
Linden, MI
s2cab...@yahoo.com
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