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 Engine Size (HP) for a New C-250?		  New Topic  Topic Locked
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 04/22/2008 :  12:01:35  Show Profile  Visit Arlyn Stewart's Homepage
Adding just a bit to what Dave is saying, very often exceeding the rpms needed to obtain hull speed will see the boat slow a couple of tenths evidently due to increased drag when the prop is not able to index forward for a clean bite of water because the hull speed is limiting forward speed.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/22/2008 :  14:48:52  Show Profile
Arlyn,

On my boat, the loss of speed when using excessive rpm's is a lot higher than a couple of tenth's. When I'm approaching the higher rpm's, the boat tries to go over the bow wave, lifting the bow, while the stern squats. This starts slowing the boat down significantly.

It's exactly like when driving a planing powerboat. From a dead stop to a certain speed, the powerboat acts like a displacement hull and glides along nice and level. As you start giving it more throttle, the boat tries to get over its bow wave which lifts the bow in the air until you give it even more throttle to get it up and over.
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MartinJW
Navigator

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USA
241 Posts
Response Posted - 04/23/2008 :  21:05:44  Show Profile
THANKS to everyone for all the great advice, comments, and recommendations.

I'm going to go ahead and buy the 25hp Gamefisher with the 15" shaft. Should be perfect. :-)

Seriously, it's the 9.9hp Honda with the 25" shaft, electric start, and power tilt. I would have been happy to buy the 8hp (and save $300), but I couldn't get the 25" shaft AND electric start AND power tilt in the 8hp. (My wife has a bad back, so we really need the electric start and power tilt in case of an emergency.)

Thanks again,
Martin
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.