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Expected Cruising Speed?

2K views 16 replies 12 participants last post by  travlin-easy 
#1 ·
I am a novice, both to sailing and to these forums. I have a Hanse 400 (2011) with a Volvo Penta 40-hp engine. I'm wondering what you would expect the average cruising speed to be at about 2200 rpms in average seas? Thanks so much for your help!
 
#5 ·
Have you not taken possession yet?? Chuckles is right, you'll have to see how your prop/engine combination works out for you, but certainly I'd think you could do 6.5+ knots under power unless big chop/headwinds are at play..
 
#6 ·
I'd hesitate to put a speed on a specific RPM - but - 40 foot modern boat with a 40 hp engine should be able to make hull speed or near it.
My 20k pound (light load) 38 foot Irwin can eventually get there with it's 44hp, in flat water and a 16 inch max prop 3 blade set to 15 pitch (according to previous owner, I've not seen it, water's too murky).
 
#7 ·
True... and the Hanse has a pretty long waterline so 7 or better is likely.
 
#9 ·
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."
 
#12 ·
True

The review posted showed 7.5 at 2500 rpm.

Other factors include

prop
bottom
towing
etc..
 
#17 ·
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 :cool:
 
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