Size of motor boat propellers

Anything to do with Propulsion.
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KR2_Diving
Posts: 391
Joined: Aug 30th, 2012, 11:43 am
Location: Currently: NW Suburbs of Chicago. Originally: NE Wisconsin

Re: Size of motor boat propellers

Post by KR2_Diving »

Has anyone ever tried mounting TWO props to one motor?
For example, mount a LH thread and a RH thread to the same motor shaft, so that when the motor spins forward, you get optimal thrust on one of the props, and when it spins in reverse, you get optimal thrust on the other prop?

Perhaps you might sacrifice max thrust in each direction, but you main gain a more equal thrust ratio in each direction of movement?

Thoughts?
Triton
Posts: 30
Joined: Sep 20th, 2012, 6:37 am
Location: Aigio, Greece

Re: Size of motor boat propellers

Post by Triton »

Actually we had the same thought when we were trying fans from PC power supplies as props.
We never tried it though, as we thought that the two props (Left and Right) will push water in opposite directions when put on the same motor.
I would expect to lose a lot of thrust (actually to remain more or less at the same place even at FWD or RVS).

Still, it would be interesting to try it to see how it behaves.
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