Study Hall:

Alan Wheeler · 20-08-2007, 00:27

Seeing as this question comes up often in many related topics, here are some formulae to enable you to work out the Hull speed of your displacement vessel.

Please Note: This is the theoretical speed. It does not take into account certain variables. Rule of thumb would say that you will not reach theoretical hull speed in normal circumstances.

S = 1.34 x (square root of waterline length in feet )

Hull speed = 1.24 * LWL^1.433 / Disp.^.311

Hull speed (Vk)=[square root (LWL in ft x 0.3034)] x 2.5

**GordMay** · 20-08-2008, 01:41

Propeller Clearance Dimensions
Goto:
http://www.cruisersforum.com/gallery...p?i=4649&c=500

20-08-2007, 00:27	#1
Alan Wheeler Registered User Join Date: Dec 2003 Location: Marlborough Sounds. New Zealand Boat: Hartley Tahitian 45ft. Leisure Lady Posts: 8,025 Images: 102	Study Hall: Seeing as this question comes up often in many related topics, here are some formulae to enable you to work out the Hull speed of your displacement vessel. Please Note: This is the theoretical speed. It does not take into account certain variables. Rule of thumb would say that you will not reach theoretical hull speed in normal circumstances. S = 1.34 x (square root of waterline length in feet ) *Hull speed = 1.24 LWL^1.433 / Disp.^.311 Hull speed (Vk)=[square root (LWL in ft x 0.3034)] x 2.5** __________________ Wheels For God so loved the world..........He didn't send a committee.

20-08-2008, 01:41	#2
GordMay Administrator Site Administrator Join Date: Mar 2003 Location: Thunder Bay, Ontario - 48-29N x 89-20W Boat: C.L.O.D. (Cruiser Living On Dirt) Posts: 8,819 Images: 217	Propeller Clearance Dimensions Goto: http://www.cruisersforum.com/gallery...p?i=4649&c=500 Attached Thumbnails __________________ Gord May ~~_/)_~~ (Gord & Maggie - "Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?"

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