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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

engine weight

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jtbarrett
1st Mate

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USA
60 Posts

Initially Posted - 01/07/2006 : 13:51:38

Currently I am looking at a outboard that is 96 pounds in weight. I am wondering what the recommended weight, as to not drag the stern through the water would be for our boats.

Thanks..

Jonathan T Barrett
'82 sk sr #3047
ypyc.org

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 01/07/2006 : 15:05:54

What you need to look at is the total weight aft. I would put the # at 600lbs when I really notice. The engine will always be back there and there is not much you can do about it.so now you have #500 of crew weight to play with before the stern on mine squats. This is just a stab at it. I can certainly tell the differance between 2 and 3 adults in the cockpit. If you find the stern down too much, it is time to move some "ballast" forward. The batteries could be relocated under the v-berth for instance to get the bow down.

It is easy to figure out using the weight x arm =moment formula. The center of flotation on the 25
is around 2 feet behind the mast. If the 100lb engine is 14 feet behind this it exerts 1400ftlbs of force torwards the aft. Now take the batteries(140lbs) and and move them 10 feet forward and you have gone the other way by 1400 ft lbs.

This is a long geeky answer to your question. No, it is not too heavy.

Tom.

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ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 01/07/2006 : 15:27:58

A 95lb outboard should not be a concern unless you're going hard-core racing.

As you've probably found out if you've been engine shopping, most modern 4 strokes of appropriate horsepower and shaft length (8hp+ and 23"+ shaft) will weigh in around 120 lbs. A notable exception among them is the Nissan which is under 100 lbs.

The C25 is a big enough boat to handle these engines without sitting off her lines so no extra ballast forward is needed. However, many of us have added backing and or facing plates in the engine mount area to prevent transom flex in rough conditions.

Over on the C250 side, a lot of owners are adding considerable amounts of ballast in the forepeak to get their boats to trim out properly. (Probably not due so much to engine weight as to hull form issues).

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jwilliams
Captain

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USA
357 Posts

Response Posted - 01/07/2006 : 19:11:50

On Hey Jude I have moved everything to the forward locker (under the V berth) that is not necessary quick, i.e. spare clothes, tarps, covers, bed boards. I have stopped carrying more than 5 gal of extra fuel in the port aft locker (used to carry 10).

With no one aboard she sits slightly lower forward than aft, using the bottom paint stripes as a guide. With two in the cockpit she is just about even keel.

Can't really tell the dif, tho.

Jim Williams
Hey Jude C25fk 2958
SF Bay

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jtbarrett
1st Mate

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USA
60 Posts

Response Posted - 01/09/2006 : 15:59:02

Thanks for the info everyone. Once again a very useful site.

Jonathan T. Barrett
'82 sk sr #3047
ypyc.org

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dblitz
Navigator

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240 Posts

Response Posted - 01/10/2006 : 20:10:53

Continuing with the questions of balance, I was thinking whether, when you pump the waste tank it is better to empty the water tank or whether an empty waste tank means that the boat will handle differently with the weight of water in the water tank. Also, will diesel in the fuel tank (slightly to port) under the vberth correctly balance the inboard diesel?

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 01/10/2006 : 21:01:31

You will find that every boat balances differently. There are so many variables including the layup of the boat itself. I had to swap my engine from the port to starboard side to get things evened up.

Tom.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 01/10/2006 : 21:26:24

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by atgep
 I had to swap my engine from the port to starboard side to get things evened up.
<hr height="1" noshade id="quote"></blockquote id="quote">

On an '88? Some P.O. must've swapped it to port.

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 01/10/2006 : 21:52:07

That is the way it came from the dealer/factory. The Eng to port and the ladder to stbd.

GO figure. The boat was commissioned before the internet.....

Tom.

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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.