HPs with the two big rudders are best sailed without any leeway. The trailing rudder is cranked on to balance the natural weather helm and that counters leeway, at least to some degree and depending on conditions. On the 18m proa with dagger board the leeway becomes negative if the board is left down sailing freer than 60 degrees to apparent wind. So leeway is not really a factor for flow over the hull.
I have only experienced laminar flow and its drag reduction benefit in dead calm conditions. It may be possible on the first 1 to 2m of a HP hull if it is gliding along but the bow wedge of the hull usually transitions to parallel sides around the 2m mark. The reduced pressure at the transition will likely induce turbulent flow under the best of conditions.
On 23/10/2016, at 11:12 PM, "Björn bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au> wrote:
Is the flow turbulent 2m from ends because of things like leeway, or would they also be turbulent while motoring in a calm seas tate?
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Posted by: Rick W <rickwill@bigpond.net.au>
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