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On 06 May 2004 13:44:49 GMT, ospam (Stephen Baker)
wrote:

Parallax says :

At the risk of starting a flame war:

Uh-huh?

Most keels do NOT act as vertical wings but only provide a lateral
force to resist windage and to keep the boat going straight. To be a
good wing, they would have to have an assymetrical cross section.

No-one claimed they were a "good" wing, just a wing. Mostl planes would fly
pretty nicely with a symmetrical section if there is enough alpha applied ;-)

Indeed, aerobatic biplanes normally have symmetrical wing foils. A
"good" wing for a symmetrical situation is symmetrical.

Any boat with pretense of performance in recent years has had
consciously designed underwater foils, often done with hydrodynamic
simulations.

Rodney Myrvaagnes J36 Gjo/a

Ask not with whom the buck stops . . .