Les Criscillo wrote:
>> When using the new templates, which level line is used in a stock
KR2? I bought my KR in the boat stage, with the center main and rear spar
already installed. I'd built one set of wings, but had done such a poor job
on them, that I pulled all the glass and foam off and resolved to start over
again.
They are stock length, and I don't plan on making any changes other than
adding the required 1/8" cap strip on the forward spar. I've looked over
the templates and see the chord line and 2 level lines marked with the
notation that these are for 1.75deg of incidence. As mine is already set,
I'm not sure where to go from here. <<
Les, did you see the instructions at
http://www.krnet.org/as504x/as5046inst.html ? Here's an excerpt:
"If your horizontal stabilizer is already glued in place at the zero degrees
incidence called for in the plans, you can install your wings with 1.75
degrees of incidence at the root. The goal is to have 1.75 degrees of
"decalage" (angular difference) between the h/s incidence and wing root
incidence. The spruce spacer (under the aft spar) will probably be about 1"
tall if your h/s is set to 0 degrees, or 1.29" if your h/s is set to -.75
degrees, but these are only approximate. This is ONLY if your h/s is already
set to 0 degrees. The templates that we ship are in matched sets, with one
version yielding -.75 degrees for the h/s and 1 degree for the wing root,
and the other version using 0 degrees for the h/s and 1.75 degrees for the
wing root. Use of our h/s and v/s airfoils is optional. "
I think this answers your question. You have the correct set of drawings
for your application. The chord line is really just there for reference.
Assuming your fuselage is level (and it should be for this stage) then you
use either or both of the "1.75 degree level lines" to set the incidence.
Those lines are to be set to be parallel (level) to the longerons or
whatever you call "level" on your airplane. The end result will be that
your chord line is inclined 1.75 degrees to your fuselage, which is closer
to the correct incidence for this airfoil. See the instructions, if you
haven't already. It's the same process as building per the plans, except
that the level line on the template is inclined 1.75 degrees to the chord
line rather than 3 degrees.
Mark Langford, Huntsville, AL
N56ML "at" hiwaay.net
see KR2S project at http://home.hiwaay.net/~langford
