Sid Wood wrote:
....the new airfoil developed for the KR-2S is about 1-inch thicker at
the root section. The extra thickness requires an extra tall spar at
the center spar location; keep that in mind when bolting gear leg
brackets to the center spar.
You may be referring to the AS5048 airfoil, rather than the AS5046
airfoil, which was intentionally designed to leave the main spar at
stock dimensions with respect to the main spar.
From the "new airfoil" website at
http://www.krnet.org/as504x/templates.html
The AS5046 profile is a best fit for stock KR2S spars. If your spars are
already built, you would want to use the AS5046 airfoil. It uses a stock
aft spar and a slightly taller main spar, which could be heightened by
laminating an extra .125" thick strip of spruce to the spar cap. The aft
spar would also need to be moved up about an inch with relation to the
fuselage due to differences in the RAF48 wing shape and the lower
incidence that is optimal for the wing. Each airplane varies, and
correct incidence will only be achieved using the level lines on the
templates, rather than measuring up from the longerons. Several people
have cut their aft spars out and raised them, and I'm told it's about a
3 hour job.
Adding an eighth of an inch of leftover spruce spar material to the top
of the main spar is not a show stopper, by any means...
Mark Langford
[email protected]
http://www.n56ml.com
Huntsville, AL
--
KRnet mailing list
[email protected]
https://list.krnet.org/mailman/listinfo/krnet
