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Old 03-02-2016, 08:20   #31
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Re: Question about speed...

Yes, but the difference is that this one will put to shame many sailboats in what regards sailing.

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Old 03-02-2016, 08:42   #32
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Re: Question about speed...

Kinda wonder about the practicality of transferring the required power into forward thrust with screws. Would probably require significantly different power transfer, wouldn't it? I'm not familiar with what the 20,000 pound planing boats use for power transfer?

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Old 03-02-2016, 09:00   #33
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Re: Question about speed...

In effect the op is saying I know nothing about sailing but am concerned that it might get too windy and a large motor might get me home quick before I get into trouble.
By quick he means at over 15 k/hr.
Most monohulls of that size will max out at about 7 k/hr, not always in the direction you want to go. They won't go faster under increased power for the reasons others have given. Fuel costs would rise exponentially. Further sea state would limit speed to around 7 knots, or the boat would break up.
There are better means of avoiding trouble. Namely choosing area and weather forecasting.
There are also means of handling adverse weather namely by reefing, and other ways and threads on handling storms.
The prospect of bad conditions can be scary however part of learning to sail, is to acquire confidence and competence in handling this and avoiding it.
It is those 3 aspects I suggest you focus on, in initially small steps, before you get carried away with plans.
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Old 03-02-2016, 13:00   #34
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Re: Question about speed...

Originally Posted by SimonV View Post
Hey 40'cruisingcat, what would happen if you strapped 2 200hp outboards on the back of your cat. Curious ?

Sent from my GT-N7105T using Cruisers Sailing Forum mobile app
You'd think it would go faster than it does with 2 x 20hp! (Assuming the necessary reinforcing was done)

A similar boat had a single 60hp outboard on it. Top speed motoring was about 12 knots, where ours is about 9.5.

200hp outboards are seriously heavy. Buoyancy would be all wrong. Maybe if they were centre mounted...

But just how fast it might go with 2 x 200 hp... really no idea. The law of diminishing returns would certainly play it's part.
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Old 10-02-2016, 20:49   #35
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Re: Question about speed...

This is a ridiculous question. If you really are that serious about speed to avoid weather than the base choice of a 33' sailboat is your problem, not the propulsion system. Buy a twin screw, dual engined, powerboat that consumes 50 gallons/hour of fuel.

As a theoretical exercise, you can certainly attach the engine from a Boeing 757 to the roof of a 67 Chevrolet. The definition of "working" is debatable, however, as you'd likely end up winning a Darwin Award as the base vehicle was never designed for that propulsion.

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