High Quality Plan Sets and Laser Cut Partial Kits for Radio Control
Aircraft
Page 24
Henry Struck's 1937 Benny Boxcar in 108 inch span
Fortune
smiled and the surface travels worked out well with no transmitter
adjustments to servo travel. It is best to use servo arms that have
the same distances between the points the cords are attached as do the surface control arms. The
larger that distance is, the easier it will be to tension the cords to
limit surface free play without
developing extreme tension. There will be less binding in the
control circuit as well which improves the centering of
control surfaces.The
Kevlar cord does not change tension with temperature not does it creep while
under tension. It has high resistance to fraying.
A slotted 1/16 balsa plate was installed where the lower elevator cord entered the
fuselage. The cords will be left in the fuselage while it is
covered. They will be pulled through small cuts in the covering as
it progresses past the interception points.
The upper interception points. The
upper elevator cord is the one most forward.
The covering has been attached up
to the left side of the slot, the slot is melted in, the cord is pulled
through and then the covering is attached the rest of the way to the tail
end of the fuselage.
About 5 rolls of Ultracote later the
Boxcar 108 is covered. There was a lot left over to cover small
models with but the 16 inch chord of the wing uses up full rolls at an
alarming rate. Doug Barton polishes off the last of the building
dust.
