The "thrust" of the propeller is also extraordinary,
being between 250 and 260 pounds. The force of the
wind displacement is strong enough to knock down a
good-sized boy as one youngster ascertained when he
got behind the propeller as it was being tested. He
was not only knocked down but driven for some distance
away from the machine. The propeller has four
blades which are but little wider than a lath.
Machine Built by Students.
Students at the University of Pennsylvania, headed by
Laurence J. Lesh, a protege of Octave Chanute, have
constructed a practical aeroplane of ordinary maximum
size, in which is incorporated many new ideas. The
most unique of these is to be found in the steering gear,
and the provision made for the accommodation of a
pupil while taking lessons under an experienced aviator.
Immediately back of the aviator is an extra seat and
an extra steering wheel which works in tandem style
with the front wheel. By this arrangement a beginner
may be easily and quickly taught to have perfect control
of the machine. These tandem wheels are also
handy for passengers who may wish to operate the car
independently of one another, it being understood, of
course, that there will be no conflict of action.
Frame Size and Engine Power.
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