Propeller revolution

[M20F]

Question from an 8yr old, engine is 2300 RPM’s what is the prop turning.  Too lazy to do my own research but too mindful to make up a number to tell them.  Approximate is fine, realize it varies with the prop.  Thanks ;-)

[gsxrpilot]

I believe the prop in your IO360 is bolted to the crank. Therefore 2300 RPM is both for the crank, the prop, and anything else spinning as well.

If you were flying say a Kitfox with a Rotax 912 on the nose, there would be a gear box to reduce the RPM of the prop below the RPM of the engine.

[carusoam]

In a non-geared engine like in a Mooney...

Engine rpm and prop rpm are identical.

Hope that works for the young’n....

When an engine has a gearbox it will have a G in its name... Like a GIO360.... Look up an early Cessna 172 it had a geared six cylinder engine, if you need an example...

PP thoughts, not a mechanic...

Best regards,

-a-

[M20F]

2 minutes and done, thanks. 

[carusoam]

To make it look like you know all the answers to all the aviation engine questions...

explain the constant speed prop, and how the governor works...  

Its better than an infinite gear box in the automotive world...

Go MS!

-a-

[Yetti]

Next up define PRU

[Guest]

Propeller reduction unit.

[PT20J]

I learned a while back working on radials (most of which have planetary reduction gears): the tach always reads crankshaft RPM. 

[0TreeLemur]

The rage in turbine engine efficiency presently is geared fans.   P&W has developed a new engine with a reduction gearbox that turns the fan considerably slower than the compressor section, allowing the fan to work with considerable increase in efficiency.   That too is a planetary reduction gear system.

[EricJ]

19 hours ago, Fred₂O said:

The rage in turbine engine efficiency presently is geared fans.   P&W has developed a new engine with a reduction gearbox that turns the fan considerably slower than the compressor section, allowing the fan to work with considerable increase in efficiency.   That too is a planetary reduction gear system.

I'm hearing that both P&W and RR are having a lot of trouble with these, though.