The difference in wetted surface between proa and tri will not be 40% in light conditions but something less than that. There needs to be a reasonable immersed length of the ama to avoid wave making drag.
Then the tri has the windage of the windward ama and its beams. That is not insignificant.
The light air performance is likely to favour the tri but it would require detailed analysis to assess the difference.
Rick
On 3 Mar 2019, at 3:06 am, Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:But will the ama really add 40% when just touching the surface?
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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