A cambered foil does not need an angle of attack to generate lift.
You also need to consider the peak Cp of the foil as well. Anything but a flat pressure profile is going to create cavitation issues at foiling speeds. My guess is that the peak Cp is over 2 at 3 degrees AoA. That means cavitation will begin around 20kts. At 5 degrees the peak Cp will be around 4 so cavitation will start at 15kts. Evan with as little as 2 degrees Cp will be around 2 so it will begin cavitation around 27knots. More likely lower than that due to surface irregularities.
On 14/12/2014, at 7:12 PM, "cruisingfoiler@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
When it comes to foiling, the foils must support the weight of the boat, so angle of attack is required.
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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