Homemade boat motor rating using formula?

rjrobin2002

Petty Officer 3rd Class
Joined
Feb 27, 2010
Messages
89
I found this formula and am wondering how to measure the transome on my aluminum boat. It is 3.5' at the bottum of the transom and 5.5' at the top. Which measure do I use?

(2 X L X W) -90 = rated horsepower

Where:

L=boat length
W=transom width; if the boat does not have a full transom,
the transom width is the broadest beam in the
aftermost quarter length of the boat.

The rated horsepower may be rounded up to the nearest "5".
 
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