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View Full Version : What is 'reduction gear' with regards to propellors?



Xiolablu3
04-15-2009, 05:40 AM
As title...

Xiolablu3
04-15-2009, 05:40 AM
As title...

julian265
04-15-2009, 05:49 AM
A gear that reduces the RPM of the propeller.

For example, IIRC the B-29 had around a 1:3 ratio, so the engines span three times faster than the props.

Engines have a desired operating speed, as do props, so the gearing helps to keep both "happy".

K_Freddie
04-15-2009, 05:57 AM
Helps optimise the power transfer from one set of mechanics to another.
http://forums.ubi.com/groupee_common/emoticons/icon_cool.gif

R_Target
04-15-2009, 06:54 AM
Prop tips would be going supersonic if they ran the same RPM as the engine.

Xiolablu3
04-15-2009, 07:30 AM
Ahhh, so its like the first gear on a car? As the low gear allows the wheels to spin slower for a certain amount of revs?

danjama
04-15-2009, 08:41 AM
Yes exactly. Gears are gears after all.

danjama
04-15-2009, 08:45 AM
Very simply:

http://www.nomeking.com/rgr20000.jpg