Posts: 168
Joined: Thu Jun 03, 1999 3:05 am

Turbo propellers

Sat Dec 05, 1998 5:16 am

How are turbo propellers different from piston engine driven propellers? The early aircraft used in WW-I were piston engined, I am sure. But were turbo props used in WW-II bombers like the B-29, B-17 etc? Piston engines were IC engines where reciprocating movement of the pistons was translated into circular movement by gears and other machinery. How are turbo props different? Would appreciate any information on the subject.

RE: Turbo propellers

Sat Dec 05, 1998 6:50 am

In a turboprop engine, the propeller is turned by the turbine to which it is linked. The connection is geared down quite a bit though cause the turbine is turning way too fast to be turning the propeller just as it is. Basically I'd say that the turboprop engine is just like a jet engine, except that the turbine is linked to a propellor which it turns.
Posts: 125
Joined: Tue Sep 20, 2005 6:40 pm

RE: Turbo propellers

Sat Dec 05, 1998 11:55 am

To answer about the B-29,B-17 Ect.,no,they were'nt turborpops,but they did have some big beautiful radials!Like MD-11 said, Turboprops basically are jet engines with a gear box reduction,where as the pistion engine had no gearing down.Something interesting about turboprops,is that they are almost always running at 100% power,and the only thing the pilot controls are the prop pitch levers.

RE: Turbo propellers

Sun Dec 06, 1998 8:18 am

In WWII alot of the bombers were powered by radial engines.
These were the huge engines with as many as 24 cyls.
As far as the propeller, the only real differences I can see are that of course they are constant speed, they are usually bigger in diameter too.
Usually fully reversable. The blades are more stout also.
Most are featherable. Which is to say in case of an engine failure, the blade angle can be set to align itself with the relative wind causing much less drag.

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