Your theoretical hull speed should be 7.3 knots. Not unusual to exceed it in the right conditions, particularly if you can surf.
Formula is 1.34 x square root of WL in feet. Theoretical hull speed asses a displacement (mon-planing) hull will create a trough with a crest at the bow and at the stern. The assumption is the boat will not escape this trough. This the theoretical speed is the speed of a wave with a crest to crest wavelength equal to the boat's waterline. Some of the older designs have a raised stern counter. Thus the requirement to heel the boat to get the counter in the water to stretch the waterline and thus the speed. Dennis C. Touché 35-1 #83 Mandeville, LA Sent from my iPhone On May 19, 2013, at 2:47 PM, David Knecht <davidakne...@gmail.com> wrote: > I had my "new" C&C 34+ out for a first sail this week on a blustery day. I > am not sure what it was blowing (my wind instrument is awaiting delivery of a > pod) but I would guess in the 15 knot area. We had up main and 100% genoa > and were doing 7.5 knots steady peaking near 8 knots on a close reach. This > is alot faster than my 34 would do under these conditions (note smile on face > of skipper), so I put the hull through a hull speed calculator based on the > 29.75 foot LWL listed in the specs. It was calculated at 7 knots. The GPS > and speedo agreed that I was going faster than this, so now I am curious as > to what hull speed actually would be expected. Thanks- Dave > > David Knecht > Aries > 1990 C&C 34+ > New London, CT > > <pastedGraphic.tiff> > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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