Indianapolis Times, Indianapolis, Marion County, 15 November 1950 — Page 19
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~ craft as large as the Navy's giant 60-ton Convair
long experience in-all ty pes of engine and propeller
: . series of fg tests. -.
THE INDIANAPOLIS TIMES
A new kind of Air Travel is in the making
New Navy engine-soon to undergo first tests in civilian (ransport -promises smoother. faster. quieter, more pleasant air travel
y/o short time the first American commercial airliner ever to be powered by turbine engines will be delivered to the Allison Division of General Motors.
The power plants in this Convair are new Allison Model “501” Turbo-Props— commercial of the Navy 138. They are geared to a new highperformance propeller especially designed and built for high-engine-power characteristics by the Acroproducts Division of General Motors.
version
The “5017 is lighter, smaller, smoother and quieter than any other propeller-type engine of equal horsepower —and much more efficient than a jet, up to near-sonic speeds.
Dev eloped for miliary use, the Allison Turbo- Pron engine with Aerbproducts Propellers has already set new performance targets in multi-engine air:
XPSY flying boat and also in a high-performance, carrier-based Navy attack plane, the XA2D. So the next step is to adapt this new type of power to commercial use.
"0 one is better fitted to do this than General Motors with its great technical ability and
dev cloprhent.
As soon. as this experimental T who -Prop transport is delivered, General Motors-Allison engineers will start puffing it through a long and | comprehensive—
5 ¢ reduction i gear box S— a
UE CTL
é The Turbo-Prop Engine is a gas turbine engine, like the well know Turbo-Jet.
exhayst gas is used as jet. thrust.
The Allison T38 Turbo-Prop Engine develops 2,750 horsepower, yet weighs only 1,250 pounds — 2.2 horsepower . forevery pound of weight. This is more than twice the power per pound of weight developed by the best recipro-
cating type aviation engines used ‘in World War II.
But in the Turbo-Prop, as the diagram shows, the turbineis connected through a drive shaft and reduction gears to a special type Aeroprop ‘Propeller. Air enters the compressor, which feeds it under high pressure into the combustion chamber, where it is mixed with. fuel and ignited. The thrust of this hot gas drives the turbine which generates the power to operate both compressor and propeller. The small amount of energy remaining in the
Allison also produces, the J33 and [35
Shooting Stars, Thunderjets, Panthers; - Scorpions and other near-sonic-speed jet fighters.
HOW THE TURBO-PROP ENGINE OPERATES
C34 1-171]
Turbo-Jet Engines that power today’s :
In cooperation with the airlines it will be flown ‘under all tvpes-of operating conditions —in all kinds of weather. It
checked” and reche
will be given: the WOIKS, :
Hines over. until all HS performance characteristics are definitely evaluated. mien TL :
This is in accordance with General Motors’ policy of
sponsoring ta the public only products that have been
thoroughly proved in advance. It is GNI's task to demon- |
strate for airplane manufacturers, airline. dperators and the Civil Acronautics Authority that Turbo-Prop power
is as'safe and practical as it is economical and comfortable.
wer an all-out test program may take a vear or more. But it will be well worth it, present military experience indicates that "Furbo-Prop
in view of the fact that power should bring the following benehts to commercial aviation’ :
Smoother operation — for passenger comfo rt; also lower maintenance and overhaul costs.
Ability to use Wicost, low-octane fuels, without increased
consumption.
Jour key Hn Lutter owner
ALLISON AIRCRAFT ENGIN CES . ‘ BUICK e CADILLAC |»
ked many
“MORE AND BETTER THINGS FOR MORE PEOPLE
EN EhAL J
. AEROPRODUCTS PROPELLERS + "BODY BY FISHER +
.
So. = vs ~
Faster speed —up to maximum limit. porniitted by airfrante design.
—~Verylow-engineweight—les than half = increasing range or pay load. :
Much improved take-off and clini fleriniging 4 use 2 of
shorter runways, with greater safety and better schedules. . : i] . . !
- Quieter operation —more restful and pleasant travel.
Usable in present dircraft = no costly modifications in changing over to turbine power. f
When General Motors is sutivied with its tests-of these chgines and they are approved for commercial use by the C.AA, it will be possible to convert present airliners to turbine power without further delay = giving America very high-speed, low-cost, regular airline service.
smoother
The development of the Allison. ‘Turbo-Prop engirie, America’s. first axial flow propeller-type turbine engine, together with : Seroproducts Propellérs, is another example
“of General Motors ad who serves prog ress,
sery es the. nation.
OTORS
CHEVROLET + PONTIAC GMC TRUCK & COACH
Allison “501” Turbo-Prop engines fit in nacelles of present commercial transports.
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