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Godfrey, Kneeland, Jr. (ed.) / The Wisconsin engineer
Volume 59, Number 4 (January 1955)

Elton, Bob
W. S. P. E.,   pp. 30-37

Page 37

Engineers Pioneer v t I
Power Plant Development
      GEORGE D. KEMP, who received his B.S. in Mechanical Engineer-
      ing from Colorado A. and M. last June, is shown recording data
on the engineering log sheet from the industrial TV screen in the VTO test
cell. George-now in the Test Operations group in the Experimental Test
Section at Allison-is working on the T40 turbo-prop engine which powers
the Convair XFY-1 and the Lockheed XFV-1 vertical take-off aircraft.
* Early in '51, Allison undertook the power plant de-
velopment for vertical take-off airplanes following the
Navy's request for a high-power, low-weight turbine
engine which could be adapted to vertical operation.
   With modifications, the Allison T40 turbo-prop
engine-with its extremely high power-to-weight-ratio
-was selected to do the job. The vertical operation
necessitated basic design changes, such as changing
the oil system so it would function in both vertical and
horizontal positions. Too, it was necessary to modify
the reduction gear, giving a higher propeller RPM
and increased thrust. And, with the specially designed
propellers required by the VTOs, the control system
was redesigned.
   Then, to test the engine, a radically new test stand
was designed and built. Allison engineers converted
a test stand previously used for low horsepower re-
ciprocating engines to one (shown above) capable of
accommodating VTO engines in the various positions
from horizontal to vertical. With the huge 72,000 pound
tunnel completely enclosing the engine and propeller,
a television was installed in the control room so engine
operation could be observed in any tunnel position.
   The VTO power plant project is typical of the
variety of challenging problems handled by the Alli-
son Engineering staff. And, because it is continually
pioneering in advanced engineering developments,
Allison needs additional technically trained men, espe-
cially young graduate engineers. Why not plan now
for your engineering career at Allison. Write for in-
   R. G. GREENWOOD, Engineering College Contact.
   ALLISON DIVISION, General Motors Corporation,
   Indianapolis 6, Indiana.

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