Yes your maths is wrong. Meaningless numbers.
The Cl of 1 combined with wing area of 25sq.m and apparent wind speed of 15kts gives you the wing lift force. That has to be resolved into a drive component for the particular point of sail. At 20 degrees to apparent wind the drive is 315N. If that is enough to get your 5mph then the power delivered at the hull is 662W (0.89HP) - not much.
With a solar boat design you begin by developing a weight estimate (all the goodies you need or want to carry along with crew) and combine that with a target speed. That gives a starting point for the hull design.
On 08/01/2016, at 10:50 AM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
(my math may be wrong)
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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