Does boat lean less when planing?

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Discussion Overview

The discussion revolves around the behavior of a boat's lean angle when it transitions from a stationary position to planing at speed. Participants explore the forces at play that may influence the lean angle, considering both theoretical and practical implications.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant states that a boat leaning 15 degrees with a 500kg weight on one side may lean less than 15 degrees when planing, questioning the forces that would reduce the lean angle.
  • Another participant echoes the initial question, seeking opinions on whether the lean angle changes when the boat is in motion and invites reasoning behind the responses.
  • A different viewpoint suggests that the boat may be harder to lean when moving due to some force acting as a righting moment, speculating on the role of pressure distribution on the hull's bottom.
  • One participant proposes that at higher speeds, hydrodynamic lift may vary across the hull's sides due to different depths of submersion, potentially leading to more lift on one side and affecting the lean angle, though they note that the specifics would need careful examination.

Areas of Agreement / Disagreement

Participants express differing views on whether the lean angle decreases when planing, and the discussion remains unresolved with multiple competing hypotheses regarding the forces involved.

Contextual Notes

Participants acknowledge the complexity of the problem, indicating that the actual details and conditions affecting the boat's behavior need further investigation.

Who May Find This Useful

Individuals interested in marine engineering, boat design, or hydrodynamics may find the exploration of forces affecting boat stability during planing relevant.

xyz
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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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