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 Topic Review (Newest First)
 06-12-2013 10:21 PM travlin-easy Re: Expected Cruising Speed? All those formulas make assumptions, ie..., clean bottom, perfect prop, dead calm conditions, etc..., most of which never seem to exist. I suspect that 7 would be very optimistic, and 6 would be somewhat more realistic under perfect conditions. Put some crud on the bottom, a couple barnacles on the prop, and 5 is about it. Just sayin, Gary 06-12-2013 09:56 PM lowtide Re: Expected Cruising Speed? Quote: Originally Posted by jackdale View Post In theory sqrt39.3*1.34 = 8.4 knots The waterline is 35' 5" (35.4), so; sqrt 35.4 * 1.34 = 7.97 Just like the review says..... ' 06-12-2013 06:17 PM bobperry Re: Expected Cruising Speed? 8.4 knots is a bit optimistic at that rpm IMHO . 06-12-2013 06:13 PM Bene505 Re: Expected Cruising Speed? Quote: Originally Posted by wooling View Post But not with 2200 rpm...... ;-) The last bit of power makes the smallest difference. So 2200 rpm ought to be reasonably close to the 2500 rpm number. Regards, Brad 06-12-2013 06:03 PM jimrafford Re: Expected Cruising Speed? We have a cs 40 w/ a 43hp volvo. About 19000lb disp. We cruise at a little over 7 and see 8.5 wot. Jim 06-12-2013 05:13 PM jackdale Re: Expected Cruising Speed? Quote: Originally Posted by wooling View Post But not with 2200 rpm...... ;-) True The review posted showed 7.5 at 2500 rpm. Other factors include prop bottom towing etc.. 06-12-2013 05:08 PM wooling Re: Expected Cruising Speed? But not with 2200 rpm...... ;-) 06-12-2013 04:15 PM jackdale Re: Expected Cruising Speed? Quote: Originally Posted by tommays View Post I do 6 knots no problem with the A4 Cal 29 with a 24' WLW I would sure hope a modern 40' could hit 8 knots easy cruise speed with a 39´4˝ something WLW In theory sqrt39.3*1.34 = 8.4 knots 06-12-2013 01:03 PM Seaduction Re: Expected Cruising Speed? From the boat review of the Hanse 40 with Volvo Penta 40hp I linked to earlier: "Once the sails were stashed-the boat is equipped with an excellent lazy-jack system for corralling the main-we conducted trials under power and saw speeds of 7.5 knots at 2,500 rpm and about 8 knots when ramped up to 3,000 rpm. The boat backed down with authority and without vibration." 06-12-2013 01:01 PM tommays Re: Expected Cruising Speed? I do 6 knots no problem with the A4 Cal 29 with a 24' WLW I would sure hope a modern 40' could hit 8 knots easy cruise speed with a 39´4˝ something WLW This thread has more than 10 replies. Click here to review the whole thread.

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