ORIGINAL: RC-FIEND
The ice skater/bar stool analogy is not valid in this instance because it ignores the effect of blade area and pitch.
I wasn't trying to explain the effects of the pitch.
P.S. how does one not see arms don't have pitch ?
No' you weren't and you did not. You indicated that the ONLY factor affecting RPM was diameter.See your words below:
"Have you ever sat on a bar stool that spins around 360 degrees, and spun your self with your arms near your body and then away from your body ?
Well if you didn't , the speed of you spinning lessons the further out you stick your arms. The closer you bring them back to your body the faster you begin to spin.
Apply this example to a prop. the bigger the diameter = less rpms. " [RC-FIEND]
You should also realize that you failed to consider the power from the engine. As you may be aware neither the bar stool or the skater is connected to an external power source. On the same engine a large diameter, low pitch prop may well deliver higher RPM than a higher pitch prop of smaller diameter.
As stated, the skater/stool analogy is invalid and irrelevant. I hope this explanation helps'
jess