5mph is 2.1m/s. So a force of 315N applied at a velocity of 2.1m/s is 662W - basic physics. AND 662W is 0.89HP.
That is what your wing is capable of producing with apparent wind at 20 degrees moving the boat at 5mph. Your 20HP is nonsense.
It is trivial for a solar powered boat to average 5mph on a sustained basis in selected latitudes. It would not even require much care with the design.
In fact information that the blurbs on autonomous boats do not provide is the split between solar and wind from a propulsion perspective. With all we know about them they might cover 90% of the distance under solar/battery and 10% under sail.
On 08/01/2016, at 3:25 PM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
Maybe you need to check your numbers, 315N is apx. 4hp not .89HP, I have no idea where you got that 662 W
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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