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Prop tip speed in cruise vs. hp & torque. Is bigger better?

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TXFlyGuy

Well-Known Member
Joined
Apr 25, 2012
Messages
2,972
Location
Republic of Texas
Here is the question...

With the LS3 V8 and the 96" 4 blade paddle prop:

3100 engine rpm = 210 hp / 375 lbs torque - tip speed is 466 mph (prop rpm 1630).


With the LS3 V8 and the current 84" 4 blade prop:

3600 engine rpm = 260 hp / 385 lbs torque - tip speed is 473 mph (prop rpm 1890).


With the above data, it appears that we could go considerably faster in cruise with the smaller propeller. Is this correct?

The above power settings would represent max cruise.
 
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