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Search took 0.00 seconds. Search: Posts Made By: DumnMad
Forum: Challenges 20-11-2013, 01:05
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

:thumb:
Forum: Challenges 17-11-2013, 19:10
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

The current causes the sailor to change the angle at which the boat is aligned to the wind power in order to get to the destination. This results in a changed wetted hull shape with respect to the...
Forum: Challenges 17-11-2013, 17:52
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Who on earth was talking about a drifting boat? And, who on earth is talking about feeling the ground? I thought we were talking about a boat on the move.
Forum: Challenges 17-11-2013, 16:39
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Count me with the stragglers. I can't get past the fact that hull resistance in the water slows a boat down, that changing the heading will change the wetted hull form, and that a hull is a foil or...
Forum: Challenges 17-11-2013, 12:54
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Thanks Hoofsmit. The hydraulic force perpendicular to current flow can be massive. I've seen heavy walled 600 dia steel piles break perpendicular to the flow due to eddie effects.
Changing...
Forum: Challenges 17-11-2013, 12:17
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Speed through the water may not change but water speed on one side of the hull is different from water speed on the other side. This changes with heading.
Forum: Challenges 17-11-2013, 12:07
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

I agree the current itself doesn't generate lift but being held against the current by wind or motor does mean there will be hydraulic lift, and this lift will alter with the heading. Easier to see...
Forum: Challenges 17-11-2013, 00:35
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Quote; Seaworthy Lass "Unfortunately some people (eg Hoofsmit) still don't understand this and think that the current is somehow acting differently on the two side of the hull creating some kind of...
Forum: Challenges 17-11-2013, 00:24
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

https://www.google.co.nz/search?q=vane+in+water&client=safari&rls=en&source=lnms&tbm=isch&sa=X&ei=fHuIUsyFLe6diAf1qYGIAw&ved=0CAkQ_AUoAQ&biw=1218&bih=690#q=foil+lift+in+water&rls=en&tbm=isch&facrc=_&im...
Forum: Challenges 16-11-2013, 18:26
Replies: 774
Views: 57,004
Posted By DumnMad
Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Just found this thread. The idea makes sense to me just as the aeroplane wing lift works with the lump on the top.(Lee bow being the top side)
Maybe water goes above super-critical and lowers the...
Showing results 1 to 10 of 10

 
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