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Old 09-03-2010, 11:32 PM
farjoe farjoe is offline
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Effective Wind Speed,Lift,Drag in VPP Software


I am trying to understand the workings of a VPP software graciously provided for free in excel format by Paul Kotzebue in this link:

VPP-software comparison

In it there are several concepts I have yet to decipher. One of them is the concept of Effective Wind Speed, Effective Drag, Effective Lift.

Can somebody lead me in the right direction pl.?
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Old 09-04-2010, 02:29 PM
Paul Kotzebue Paul Kotzebue is offline
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Effective Wind Speed is the apparent wind velocity corrected for heel angle.

Effective Drag is the aerodynamic drag component using the Effective Wind Speed.

Effective Lift is the areodynamic lift component using the Effective Wind Speed.

See also pages 162 and 163 of Principles of Yacht Design, third edition.
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Old 09-05-2010, 09:20 AM
farjoe farjoe is offline
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Thanks for your quick reply,

I actually missed the reference to the "Heeling Angle" cell. I have version one of the book and there, it is referred to on page 153 so I actually missed that as well.

It seems quite a roundabout way to account for heel angle. I wonder if just taking the COS of the Nominal sail area would have sufficed.
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