These two pieces will have a maximum strength and minimum
weight if of the T section used for the rod. If the work is done carefully,
1/4 inch each way will be sufficient.
Main Plane and Elevator.--The framework of each plane is simply four
strips of satin walnut or other suitable wood, 1/4 inch broad and 1/16 inch
or even less in thickness for the main plane, and about 1/16 by 1/16 inch
for the elevator. These strips are first glued together at the corners and
left to set. The fabric (Hart's fabric or some similar very light material)
is then glued on fairly tight--that is, just sufficiently so to get rid of
all creases. The main plane is then fixed flat on to the top of the central
rod by gluing and cross binding at G and H. (A better but rather more
difficult plan is to fasten the rectangular frame on first and then apply
the fabric.) The same course is followed in dealing with the elevator,
which is fixed, however, not to the rod, but to the 4-inch horizontal spar,
HS1, just behind it, in such a manner as to have a slight hinge movement at
the back. This operation presents no difficulty, and may be effected in a
variety of ways.
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