Posted by JRP on 04/26/17 - 1:36 PM
#18
BDBinMD wrote:
Actually, according to Title 33 Code of Federal Regulations subpart 183.53, if such things as a swim platform or engine bracket contribute to the buoyancy of the boat, it shall be included in the overall length to determine max hp.
That's the max allowable hp formula. It's not the formula the designer/builder uses to determine appropriate hp rating for a hull. It only sets a cap on what is permitted.
For instance, using that formula my boat would have a max HP rating of 175. But the designer calculated the appropriate max rating at 150 HP. So the designer's calculations will be different, and will be based not just on the length and beam of the boat, but other design elements as well.
Adding a WD may change the CFR calculation for max allowable HP, but it still doesn't explain why the boat would need so much more HP than a non-WD, or 267% more HP than an Outrage 19! (That's assuming Marko's figure of 400 hp on later 22's is correct.)