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Old 11-04-2016, 19:07   #16
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Re: Aux power for the Multihull crowd.

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Originally Posted by KJThomas View Post


My experience with sleds is they are more trouble than they are worth. A tapered wave deflector mount and a long or extra long shaft makes for a nice simple set up.


Can you explain a bit further a tapered wave deflector mount? Curious if you might have a picture available?

Aussie.....Jason Gerard (I think I got the name right) on the trimaran Spirit has rigged a motor mount. Made from an old section of aluminum spar set up on a pivot. Maybe similar to that?

Tx.
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Old 11-04-2016, 19:15   #17
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Re: Aux power for the Multihull crowd.

This is the set up on Spirit. Formula 40 refit to cruise. Nice simple idea made of salvaged material it seems.......

On line there is great video of this boat and her travels.
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Old 11-04-2016, 19:15   #18
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Re: Aux power for the Multihull crowd.

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Can you explain a bit further a tapered wave deflector mount? Curious if you might have a picture available?

Aussie.....Jason Gerard (I think I got the name right) on the trimaran Spirit has rigged a motor mount. Made from an old section of aluminum spar set up on a pivot. Maybe similar to that?

Tx.
No. It is just a section like the bottom half of a torpedo cut off at the back end with a mounting block across. Attached to the bottom of the bridge deck with a hole big enough to fit the outboard through the bridge deck.
Just like a dinghy transom mount.
The outboard is tilted as per normal to clear the water when not in use.
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Old 11-04-2016, 19:18   #19
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Re: Aux power for the Multihull crowd.

I've seen the setup called a nacelle.
No moving parts apart from the outboard's own tilt mechanism.
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Old 11-04-2016, 19:22   #20
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Re: Aux power for the Multihull crowd.



Not my boat but similar.
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Old 11-04-2016, 19:26   #21
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Re: Aux power for the Multihull crowd.

I would think the motor there would be too prone to getting flooded in rough weather. Google catamaran outboard nacelles.
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Old 11-04-2016, 19:29   #22
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Re: Aux power for the Multihull crowd.

outboards in nacelles [Archive] - Boat Design Forums
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Old 11-04-2016, 20:20   #23
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Re: Aux power for the Multihull crowd.

Has the thought, of an electric powered jet drive. Negligible drag, trunk system like a center board, with a sliding closure.??? More thrust, second electric motor via chain drive.??? 🙄


Still surrounded by anchors.
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Old 12-04-2016, 05:23   #24
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Re: Aux power for the Multihull crowd.

Nacelle........... got it. I will take a look at that.

Thanks.
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Old 12-04-2016, 06:33   #25
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Re: Aux power for the Multihull crowd.

Any input about the pros/cons of carrying large quantities of gasoline on board? Do you have gas tanks inside the hull, or store your fuel outside the boat confines? I like outboards for cost, accessibility, availability of parts, etc. but note that probably 3/4ths of the issues I have with various gasoline engines in my boating life (outboards, hookah, water maker, Honda generator) involve gummy residue in carbs and VST pumps etc. I'm also way paranoid about fires on boats. I have no qualms about filling our 140 gallon diesel tanks and storing it for long term. I suppose diesel outboards would be too odd.
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Old 12-04-2016, 11:18   #26
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Re: Aux power for the Multihull crowd.

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Any input about the pros/cons of carrying large quantities of gasoline on board? Do you have gas tanks inside the hull, or store your fuel outside the boat confines? I like outboards for cost, accessibility, availability of parts, etc. but note that probably 3/4ths of the issues I have with various gasoline engines in my boating life (outboards, hookah, water maker, Honda generator) involve gummy residue in carbs and VST pumps etc. I'm also way paranoid about fires on boats. I have no qualms about filling our 140 gallon diesel tanks and storing it for long term. I suppose diesel outboards would be too odd.
No........ IMHO storing gasoline down below is a bad idea.

Most all of us carry gas. Some more than others. I carry gasoline in 5 gallon carry jugs. They mount above deck at the lifeline/chainplate area.

I also carry two small fuel tanks for the motor. They are in separate lockers above deck with a teak lid. Makes a nice seat and conceals the tanks. All are above deck and well drained and ventilated.

I do not find a need to carry much. Max is usually about 17 gallons. Although I could bump that up to 27 if necessary.
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Old 12-04-2016, 15:14   #27
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Re: Aux power for the Multihull crowd.

You just have to arrange the storage differently. Our fuel tanks and spare fuel are carried in self draining lockers which are above the waterline, and close to the motors. Any fuel leaks will drain immediately overboard. The fuel hose runs are very short.


Haven't had the problem with aging fuel, even though our "reserve" tanks often go more than 6 months before I remember to use them up.
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