|Beech Controllable Propellers,
manufactured under the “ROBY” patents
With a Beech Controllable
Propeller you could unleash the horsepower you had not
been able to use before with
a fixed-pitch propeller..
On the commercial model Cluver the R-001 Beech Controllable Propeller decreased the
take-off run by about 30% and
increased the rate of climb by about the same percent.
Controllable Propeller R-002 has been licensed for the
Stinson 10, with a blade length of 72 inches.
Added performance is given to the Luscombe Silvaire with
the model R-002 also with 72-inch propeller and a Continental
The Model R-201 propeller is designed for controllable
pitch, and is equipped with steel tipped, laminated
wood blades. The Model R-201 was manufactured to fit engines
with modified SAE
20 spline propeller shaft ends. It
is adaptable to both opposed and radial type engines
developing up to and including 225 horsepower. This propeller
weighs approximately 52.5 pounds. (This includes the
propeller and the pitch control mechanism, as it is attached
to the nose case of the engine.)
The Beech R-203 controllable
propeller with 85-inch blades, installed on the Grumman
Widgeon powered with
Ranger engines, reduced the necessary run for a water
take-off almost one-half and reduced the ground run for
required take-off by 22.8%. The PT-19 was also equipped
with the R-203 propeller.
In comparative tests Beech controllable
Propellers have shown an increased in rate of climb and
decrease of take-off
run from 15% to 26% for the various types of airplanes
on which it was tested.
These propellers were made, during
the war, for the Army Airforce and were used on the various
and in the United States. In 1947 the Beech Propeller
was Type-Certificated on the Beechcraft Bonanza Model
35. Their record of performance is proof enough of Beech
Propeller’s ability to “take it” and
give long hours of more enjoyable, more economical flying.