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Author Topic: propulsion question  (Read 1461 times)

tigertiger

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propulsion question
« on: August 02, 2008, 05:36:35 pm »

I am about to buid a couple of sail working boats and am considering auxilary power. It would be used for recovery mainly, if the wind drops.
I would like to use one motor and prop only.

How big a motor?
How large a prop?
What diameter shaft?

Boat 1
about 1.7m long, beam 500mm. Weight about 15kg.

Boat 2
1m x 300 x 10kg

Your thoughts will be much appreciated.
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Shipmate60

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Re: propulsion question
« Reply #1 on: August 02, 2008, 05:48:33 pm »

TT,
Would you use the motor to turn her into wind or just in case the wind drops?

Bob
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tigertiger

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Re: propulsion question
« Reply #2 on: August 02, 2008, 05:57:31 pm »

TT,
Would you use the motor to turn her into wind or just in case the wind drops?

Bob

Probably just when the wind drops.
If there is a problem turning into wind, it is usually when wind is very light. If I get into trouble in stronger winds I usually wear.

But what are the options in both instances?
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Shipmate60

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Re: propulsion question
« Reply #3 on: August 02, 2008, 07:20:00 pm »

TT,
For rescue, a 380 motor on 7.2 volts and a 3 blade rivabo prop.
No speed controller required just a 10 amp microswitch.

To turn her into the wind a 540 size motor on a 45 mm prop.

Bob
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tigertiger

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Re: propulsion question
« Reply #4 on: August 02, 2008, 07:40:56 pm »

cheers
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