Idea Tester.pdf

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By Ed Lidgard
WITH supplies becoming more and more
scarce, necessity should make us modify our
modeling activities. Those outdoor models we used to
throw together with such abandon will have to be
limited so that supplies can be conserved for contest
position was already determined; all that remained
was the vertical position. The wing mount places the
wing in a parasol position and the model is quite
stable. It will, however, bank on fast power turns. To
begin with, the area between wing struts was covered
with tissue to simulate common pylon mounting
found on most gas models. A marked improvement
was noted in climbing characteristics, and the model
also became less "touchy" on adjustments. It must be
remembered that there is a difference between design
and adjustment characteristics.
The area between struts was divided into two
and replaced on top of the wing near the tips (see
photograph) , with care taken to align them properly.
This follows the theory developed by Carl Goldberg
and Louis Garami and worked out on Garami's Atom
powered model recently published in Air Trails. It's
really one swell idea! It worked to perfection. The
model rode almost perfectly level in fast climbing
spirals and thus obained more altitude. All-around
stability was improved and adjustments were not so
This R. O. G. was built with this idea in mind.
It was to be simple, quickly built and still out of the
usual stereotypes. We wanted to incorporate as many
innovations as possible, but we wanted a rugged
model. If necessary, we were going to power it with
common rubber bands.
When it was completed, we found our time
had been very well spent. It flew with all the zip and
power of a Moffett job -- naturally with flights of
shorter duration. It formed the base for some
interesting experiments. We tried variously sized
rudders and verified some theories concerning the
effect of varying the area. Too much rudder causes
sharp turn to the left and, in extreme cases, a left spin.
We went to the other extreme by minimizing the area
until a right spin resulted. A warped wing or turn in
the rudder will naturally affect the results. The rudder
shown is exactly the right area. By using just a slight
right turn a good climbing right turn can be obtained.
Having solved the rudder problem, we turned
to the center of lateral area. Its fore – and -- aft
You may want to try other experiments which
might be risky on a more complicated outdoor model.
But whether you're an old hand or still a bit
inexperienced, you'll enjoy a model like this -- so let
'er go!
Scanned From June 1943
Air Trails
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