129, and the thickness is not anywhere more than 1/8 inch. It is quite
possible to reduce the thickness to even 1/16 inch and still have a
sufficient reserve of strength to withstand the pull of 28 strands of
1/16-inch rubber wound up 1,000 times; but such a course is not advisable
unless you are a skilful planer and have had some experience in
model-making.
If you find the construction of the T-shaped rod too difficult, two
courses are open--
(l) To get a carpenter to do the job for you, or
(2) To give the rod the triangular section shown in Fig. 129, each side of
the equilateral triangle being half an inch long.
[Illustration: FIG. 150--Side elevation of model aeroplane.]
The top of the T or the base of the triangle, as the case may be, is used
uppermost. This rod must be pierced in three places for the vertical masts
employed in the bracing of the rod, trussing the main plane, and adjusting
the elevator. These are spaced out in Fig. 130, which shows a side
elevation of the model. Their sectional dimensions are 1/16 by 1/4 inch;
their respective lengths are given in Fig.
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