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Old 28-08-2018, 12:51   #46
Marine Service Provider

Join Date: May 2014
Location: Yucatan, Mexico
Boat: Molenmaker Dutch steel gaff-rigged ketch
Posts: 170
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Re: Running out of diesel, no wind.
What are the units in this formula? If I plug in my 100 ton boat at 75' waterline to reach 8.6 knots it says only 25HP. I've actually tried that and only got about 2 knots.

Quote:
Originally Posted by barnakiel View Post
However, you need only .25 hp per ton to get her to 1 sqrt lwl speed. Thus a 2.5 hp outboard should be fine to pull her into a lee side Pacific anchorage or a sheltered marina.
b.
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