John Haffner’s Esquire placed second at the 2016 Toledo Show. John’s airplane is a replica of one he
built while serving in Korea. Midwest kitted the Esquire in 1956.
neutral again, and it was ready for the
It wasn’t long after the compound
escapement was invented that someone
figured out that two escapements were
better than one. Some compound
escapements were developed so that
a third position could be obtained
during which an electrical contact
was activated as long as the key
was pressed. The third position was
close to neutral, so the rudder was
essentially unaffected. This provided
the opportunity to activate a second
compound escapement that was used
for elevator control.
Would you believe one for right, two
for left, three for up, and four for down?
Five and hold could get you throttle
control with another simple escapement
if your thumb was fast and you had
good luck. So much for the world of
The Bonner escapements sold for
$6.95 for the SN type, $14.95 for the
compound, and $9.50 for the motor
control. The motor control escapement
was an air-bleed device that required
a two-needle valve engine. The
escapement would select either needle
valve, and speed control was achieved
by setting one needle at the maximum
rpm and the other at a lower rpm or rich
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77 Model Aviation JULY 2016