I really think you should get out more.   How about a long straight rowing eight   compared to a short 8' rowing dinghy.   I could draw a side on diagram but this is really pedantic.   Really the point how different the HP behaves - it stays really level.   Which is obviously nicer motion. More efficient too maybe.   I don't know if that is actually what "moment of inertia" means but if I want to join the Science debating society I will.    Doug --- On Thu, 9/6/11, Mike Crawford <mcrawf@nuomo.com> wrote: From: Mike Crawford <mcrawf@nuomo.com> Subject: [harryproa] Re: Moment of inertia To: harryproa@yahoogroups.com.au Date: Thursday, 9 June, 2011, 23:48     I'd imagine the long-winded explanation of the same comment would be that, since harryproas are such lightweight vessels compared to their long waterlines, with much of the weight in the center, that they pitch a heck of a lot less than most other craft.  Having the waterline of an Open 40 cat, but half the weight, has got to help pitching due to inertia.           - Mike Peter Southwood wrote:   That would be a major technical breakthrough, as all other known surface vessels without active pitch stabilisation will pitch to some extent. Do you have evidence to support this claim? Cheers, Peter ----- Original Message ----- From: Doug Haines To: harryproa@yahoogroups.com.au Sent: Thursday, June 09, 2011 10:00 AM Subject: Re: [harryproa] Re: Moment of inertia   have any of you guys been on a harryproa? they don't PITCH!

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