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Propellers help

Old 09-19-2007, 03:06 PM
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cowana
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Default Propellers help

I am wondeing about propellers - 'right hand' and 'left hand' are confusing me.

I usually order right hand propellers - that, when seen from the rear spin anticlockwise to blow water.

However, I recently ordered some left hand ones, and recieved the same - when see from the back, they go anticlockwise.

Is this incorrect? Should I send them back?

Andrew
Old 09-19-2007, 03:26 PM
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mfr02
 
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Default RE: Propellers help

I take it that they (the LH ones) also push the water in the same direction as the RH ones when rotating the same way? If so, then you have been sent RH props.
Old 09-19-2007, 03:29 PM
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cowana
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Default RE: Propellers help

I think that I may have been sent LH ones before when I ordered.
Old 09-19-2007, 03:51 PM
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cowana
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Default RE: Propellers help

If I wanted to buy new props, what would I want?

I think that the prop I already had was left hand (annoyingly). Looking at this site, where they sell plastic props, [link=http://www.westbourne-model.co.uk/propellor.asp]props[/link], I can't see any PLASTIC cheap right handed ones.

I can only see hydrospeed ones (not great for a model scale boat), 3 bladed ones, and LH ones.

Thinking about it, my 13 turn motor has higher torque than I wanted so mayby a 3 bladed prop would be good on an 80cm boat powered by a 12V 7aH battery (heavy).

For a direct drive off a 700 13 turn 12V motor, what diameter 3 blade prop would you recommend?

Options:
30mm
35mm
40mm
45mm
50mm
55mm
60mm

What do you think I should buy? I don't really want to buy more than 2 props (one LH and one RH), so I want to make a descision. The motor can is 44mm diameter - there is 1 motor for each prop.

The boat will be powered by a 12v 7aH battery, and the motors will be watercooled.

Andrew
Old 09-19-2007, 04:25 PM
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rye
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Default RE: Propellers help

hi
you can ask this guy he help me out with the props for my 5' pt boat i got a left and right prop but what i did was put the right on the left and the left on the right as your facing the rear of the boat so they turn into each other the boat performs better and turns better to rye
http://www.abcprops.com/mainpages/contact.html

http://www.rcuniverse.com/forum/m_61..._2/key_/tm.htm
Old 09-20-2007, 02:52 AM
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cowana
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Default RE: Propellers help

Any ideas?
Old 09-20-2007, 04:46 AM
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mfr02
 
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Default RE: Propellers help

Buying props in the UK you have to be careful - we regard the rotation looking from the stern forward. The continentals look down the shaft from the motor, so props originating in Europe may well use that logic.
Find a reputable dealer who knows about te type of boat you are making, in UK Westbourne and A Model World spring to mind.
Old 09-20-2007, 03:33 PM
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cowana
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Default RE: Propellers help

I have decided I will buy the plastic props from westbourne models - I can buy 1 LH 3 blade prop and 1 RH 3 blade prop, so it doesn't matter which is which.

However, I would need to get the right size:
30mm
35mm
40mm...
...60mm
Old 09-21-2007, 06:18 AM
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mfr02
 
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Default RE: Propellers help

You mention a 13 turn motor. I assume that this is intended for high revs. I would certainly not consider anything of larger diameter than the motor can with direct drive, and would think in terms of smaller to allow the motor to rev up easily. What does the kit manufacturer recommend? A chat with the staff at Westboure may be helpful in making a best choice.
Another rule of thumb that I picked up was that the number of blades on the prop should be less than the number of poles in the motor.
Old 09-21-2007, 07:40 AM
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cowana
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Default RE: Propellers help


ORIGINAL: mfr02

A chat with the staff at Westboure may be helpful in making a best choice.
Done. They have cancelled my order for a Robbe 700/13, added two Eco 600s and added two three bladed props.

Andrew
Old 09-21-2007, 09:35 AM
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Default RE: Propellers help

Happy sailing!

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