Does boat lean less when planing?

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SUMMARY

When a boat is stationary with 500kg on one side, it leans 15 degrees. However, when the boat is planing, it leans less than 15 degrees due to hydrodynamic forces acting on the hull. The difference in pressure distribution on the bottom of the boat creates a righting moment that counteracts the lean. At higher speeds, variations in submersion depth lead to increased lift on one side, further reducing the lean angle.

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  • Understanding of hydrodynamics and buoyancy principles
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  • Basic physics of forces and pressure distribution
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When boat is stay in place,put on one side 500kg,boat will lean 15 degrees...

If now we go planing with this boat, will boat lean less then 15 degrees or equal?
If less,what is force which reduce lean angle?
 
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xyz said:
When boat is stay in place,put on one side 500kg,boat will lean 15 degrees...

If now we go planing with this boat, will boat lean less then 15 degrees or equal?
If less,what is force which reduce lean angle?
What do you think and why?
 
phinds said:
What do you think and why?
My intuition tells that boat is harder to lean when boat is moving but there must be some force that act like righting moment..

Disbalnce in pressure distribution on bottom boat?

(I think you can stand on edge on jet ski when planing at high speed and he will not capsize)
 
Last edited:
At higher speeds hydrodynamic lift may be different on left and right sides of the hull because of the different depths of submersion . Deeper submersion could mean more lift and therefore more force tending to reduce the angle of lean . No guarantees though - the actual details of the problem would need to be looked at carefully .
 

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