prop rpm question
Matt Whiting wrote:
Richard Lamb wrote:
If you can find the engine performance plots you will see that the
percent of RPM and percent of power (HP or torque) are not at all
the same thing.
And it's torque that turns the propeller (not RPM).
1000 rpm might be near 1/2 RPM, but barely 10-20 percent max torque.
At full power (torque), the prop can deliver x number of pounds
thrust for any given airspeed. That's the most you'll get.
Rolling off RPM also rolls one down the torque curve.
And you are right, it's a very non-linear curve.
Richard
ps:
also on the torque curve, note that max torque and max HP are usually
NOT found at the same RPM...
ta
It's been a while since I saw so many errors in so little text.
Matt
That RPM and torque are NOT the same thing?
Or that at full power will give deliver full thrust?
Ot that the thrust delivered changes with airspeed?
Or that it's very non linear?
Very oversimplified, but go ahead and straighten me out, Matt.
Richard
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