Cavitation is from low pressure, not high pressure. The top of a hydrofoil is the low pressure side. High pressure stops water from boiling.ozchrisb wrote: Sail rockets foils are all about preventing cavitation which happens at around 50 knots.
The water starts to boil on the high pressure side and it's game over.
I just watched this again , (3 years later) ; never noticed that thereozchrisb wrote: ...
You can see it happening here ... The water starts to boil ...
and it's game over.
I was into fast 2-M, RC gliders for a bit ; common knowledge thatmig27 wrote: ...
This is a nice engineering challenge for the near future I guess
i wouldnt use the ac72 design as an example to follow. that particular design is very highly constrained the weight the shape and size of the hydrofoils, I can't remember which team it was but I believe the kiwis developed a new hydrofoil they wanted to use in the cup but the rules team refused them.Bille wrote:It's called a J-foil, there efficient enough because Sail-Rocked used one.
Does Anyone know what airfoil they use on the wing part of the AC72 ?
Funny that you mention, been building and flying model air-planes when I was young too! Until somebody developed a way how to surf with a twintip and a kite....Bille wrote: @ mig27
Ya appear to have a good grasp of this ; bin studying it long ?
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