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djridgway
Deckhand

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USA
4 Posts
Initially Posted - 07/05/2005 :  20:12:10  Show Profile
what size engine give best motoring performance?? 9.8 - is 15 hp overpowering...
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thaind
Navigator

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Canada
145 Posts
Response Posted - 07/05/2005 :  20:22:11  Show Profile
Opinion of this forum, factory manual and personal experience is that anything over 10 hp is useless. I run with my 9.9 at about 2/3 to 3/4 throttle and find that more power burns more fuel with little gain on my GPS.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 07/05/2005 :  22:07:23  Show Profile  Visit Frank Hopper's Homepage

"is 15 hp overpowering.."

Irrelevant; people will point at you and talk behind your back. (go with the 9.9)
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 07/05/2005 :  22:07:54  Show Profile  Visit Leon Sisson's Homepage
8HP is usually enough, more than 10HP is over kill. I have a Yamaha 9.9HP extra long shaft high thrust elec.start, and am very happy with it. More important than raw HP is extra long shaft and high thrust prop.

-- Leon Sisson
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SailormanCGA72
1st Mate

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77 Posts
Response Posted - 07/06/2005 :  08:35:51  Show Profile
There's a fellow here in Port Isabel, Tx that keeps his C25 in Bristol fashion, but has a 30hp o/b on it. Says he needs it to tow the kids on various floating toys. Otherwise they don't enjoy going out on the boat. I wonder that the transom hasn't fallen off. He said he also has a 15hp for normal ops.
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 07/06/2005 :  15:47:16  Show Profile  Visit JimB517's Homepage
6 or even 5 HP will do the job. Extra long shaft, thats the key. Don't agree with the need for a high thrust prop. In my opinion those are for power boats using them as kickers. I beleive a standard prop will get you better MPG (although the high thrust will reverse and stop much better).

I took off my 8 HP honda and ran around with my 3.5 HP Mercury 2 stroke and it works great in sheltered water.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 07/06/2005 :  21:27:01  Show Profile
Unfortunately, no 5s and 6s that I've heard of come with extra-long shafts. Honda and Yamaha 8s do, and are quiet, smooth, and fairly fuel-efficient, but HEAVY. Nissan's 9.8 4-stroke offers the XLS, and is lighter (by about 20 lbs. based on the claims), making it the new favorite here (keeping in mind that it's new).

The 8 hp Hondas and Yamahas have ample power, and as stated above, the high-thrust prop on both is great for stopping and backing up, but requires slightly higher RPMs at cruising speed. I cruise at about 5.5 knots at a little above half throttle with my Honda 8--more throttle increases the speed a little and decreases the gas mileage. The 9.9 Honda is the <i>same engine</i> as the 8, but a couple of boat units more expensive for a few RPMs that cannot be used to any advantage on a C-25. Anybody's 15 is just more of a waste of weight, gas, and probably purchase price.
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cmckitrick
Navigator

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USA
119 Posts
Response Posted - 07/08/2005 :  08:18:30  Show Profile
When people say extra long shaft, what size do they mean? 20" or more?
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DanM
Captain

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USA
256 Posts
Response Posted - 07/08/2005 :  08:43:13  Show Profile  Visit DanM's Homepage
Yes, Charlie. 20 inches=Long, 25 inches=XtraLong.
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matsche
Captain

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USA
280 Posts
Response Posted - 07/08/2005 :  10:09:40  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by DanM</i>
<br />Yes, Charlie. 20 inches=Long, 25 inches=XtraLong.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Except for the Nissan/Tohatsu line where the long shaft is actually 23". Not sure about the XLong.
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 07/08/2005 :  12:30:12  Show Profile
I wouldn't go with anything less than an 8 unless you sail only in sheltered water where the shorter shaft length of a 6 wouldn't be a problem.

Personally I believe a 9.9 with an extra long shaft is the way to go.

9.9's are rated 9.9 rather than 10 since some insurance companies charge less for vessels powered by less than 10 HP.
Edited by - oldsalt on 07/08/2005 12:31:07
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SJ
Navigator

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USA
198 Posts
Response Posted - 07/08/2005 :  13:51:29  Show Profile
I have a long shaft 15HP on my boat, but only because it was what was available in my price range, CHEAP! A little old man used it on sundays to go fishing...For real! And only for one season. Basiclly a brand new engine and at only $995.00 it was a steal. As for the extra HP. The boat goes 5.5 with or with out the extra 5HP. If I had my choice the 9.9 is the way to go, unless you can find a little old man in you marina...:D BTW, I'm told that the 9.9 and the 15HP Merc weigh the same....
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 07/08/2005 :  17:39:03  Show Profile
With some brands like Merc and OMC, 2 cycle 9.9s and 15s are the same engine with the 9.9 being detuned for lower revs and HP. but I don't believe that extra long shafts were available in 15HP.
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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.