It was explained to me by an very experienced sailor that depending on boat design the reason the stern drops is the bow begins to ride up on the bow wave. It was very obvious to me when I used a Honda 9.9 on my Ericson 23’.. at 5KTS it rand true but beyond 5KTS the outboard mount started pushing water and the faster I went up to 7KTS it covered the engine mount. So as he told me, slow down - if sailors really wanted to motor fast they own power boats.. made sense to me. So now i try to get all my speed on my C&C 26’ with my sails.
Dan On Sunday, January 11, 2015 at 2:12 PM, Gary Nylander via CnC-List wrote: > Join the club. We (and Curtis comments later) have a boat with a flat > transom. Thus, we can notice the squat more than those with boats with > extended sterns and reverse transoms. Mine (30-1) splatters diesel crud all > over the bottom half of the transom as I am motoring at any speed at all. I > used to put a hose on the exhaust, but that looked so bad that I decided I > should just wash off the crud after a vigorous motor. > > Comments below on hull speed are relevant. > > I cruised on a friends motorsailor - at 7 knots (big motor) the boat was > pretty level, at 8, the bow came up a foot and the stern dropped a foot, at > 9, more of the same. Think about a power boat coming up on plane...... > > Physics rules. > > Gary > > ----- Original Message ----- > From: "Joe at Zialater via CnC-List" <cnc-list@cnc-list.com > (mailto:cnc-list@cnc-list.com)> > To: <cnc-list@cnc-list.com (mailto:cnc-list@cnc-list.com)> > Sent: Sunday, January 11, 2015 12:13 PM > Subject: Stus-List The stern squats at high speed > > > > Hi Tom - I notice the same thing on my 30-1 - as I increase revs the stern > > squats. I have a two blade fixed prop on an Atomic 4. I sometimes adjust > > the throttle by looking over the stern rather than the speedo - kinda > > handy. > > At high revs my exhaust is completely underwater while it is a few inches > > above water at rest. > > > > I don't know if it is really a problem or just a matter of physics - my > > power boat does the same thing, albeit more drastically. > > > > Joe Boyle > > Zia, 1975 30-1 > > Annapolis > > > > Message: 5 > > Date: Sun, 11 Jan 2015 11:54:00 -0500 > > From: TOM VINCENT <tvince...@msn.com (mailto:tvince...@msn.com)> > > To: C&C Forum <cnc-list@cnc-list.com (mailto:cnc-list@cnc-list.com)> > > Subject: Stus-List The stern squats at high speed > > Message-ID: <bay168-w12245ac078651d15ee5bd5eed...@phx.gbl > > (mailto:bay168-w12245ac078651d15ee5bd5eed...@phx.gbl)> > > Content-Type: text/plain; charset="iso-8859-1" > > > > I was wondering if anyone else has the same problem that I have with my > > 36' > > that has the 3 cylinder Yanmar 30 HP. While motoring if I increase the > > speed > > the stern starts squatting the faster I go. I top out at 6.5 knots of > > speed > > and the stern is way down. I have a martec 18'' folding prop and I do not > > know the pitch. > > > > Tom Vincent > > Frolic II 1979 36' C&C > > > > > > > > > > _______________________________________________ > > This List is provided by the C&C Photo Album. > > > > Please donate to the C&C Photo Album to keep this list free for all > > subscribers. > > > > Email address: > > CnC-List@cnc-list.com (mailto:CnC-List@cnc-list.com) > > To change your list preferences, including unsubscribing -- go bottom of > > page at: > > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > > > > > _______________________________________________ > This List is provided by the C&C Photo Album. > > Please donate to the C&C Photo Album to keep this list free for all > subscribers. > > Email address: > CnC-List@cnc-list.com (mailto:CnC-List@cnc-list.com) > To change your list preferences, including unsubscribing -- go bottom of page > at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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