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Author Topic: Prop (screw) postions  (Read 1874 times)

polycell

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Prop (screw) postions
« on: November 29, 2009, 11:56:24 AM »

Is there such a think as a left hand screw and a right hand screw.
Yes I know that there is a difference the way the baldes are configured when a boat has two screws.  So the screws I have for my tug is there a right hand screw and a left hand screw or can I put them in either position?
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Shipmate60

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Re: Prop (screw) postions
« Reply #1 on: November 29, 2009, 12:01:39 PM »

The shafts are a right hand thread so ensure you use the locknut.
Yes you can change props from port to stbd.

Bob
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polycell

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Re: Prop (screw) postions
« Reply #2 on: November 29, 2009, 12:17:38 PM »

I dunno if I have made myself clear.
I hear what you say shipmate60 thanks.  So I have two screws for my tug and they have different blade configuration (OK I'm happy with that, I understand the theory) but I don't know which one to fit into which side.  Does it matter?
I think you may have answered the dummies question am I right?
Fred
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Shipmate60

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Re: Prop (screw) postions
« Reply #3 on: November 29, 2009, 01:02:46 PM »

As a rough rule of thumb for a single rudder twin prop set up the screws give a more responsive rudder if turning inwards looking from the top.
With 2 rudder twin screw it doesnt matter that much.

Bob
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daz

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Re: Prop (screw) postions
« Reply #4 on: November 29, 2009, 01:23:07 PM »

Hi Fred,
           Did you buy  left handed and right handed props.?
If so then it do's mater which side they go on.
Some people like to have the props routating inwards for forward motion. and some like to have the props routating outwards for forward motion.
But its up to you realy?
if you get them on the wrong way round you can allways switgh the polarity of the motors around.
Hope this has helped and not confused you even more.
Daz
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polycell

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Re: Prop (screw) postions
« Reply #5 on: November 29, 2009, 05:12:21 PM »

Hi Daz I bought one of each one left and one right.
Yes thats what I thought just change the polarity of the motor thanks all.
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DickyD

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Re: Prop (screw) postions
« Reply #6 on: November 29, 2009, 05:20:11 PM »

Does this help ?

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justboatonic

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Re: Prop (screw) postions
« Reply #7 on: November 29, 2009, 10:43:09 PM »

Unless you want to stick with true scale so long as you have one 'left' and one 'right' hand prop it doesnt really matter.  You just need to make sure both motors dont turn the same way as you just end up going in circles.

Generally, modern era warships with twin props have the top of the props rotating away from the ship's centre line when viewed from the rear. Tugs and the like tend to have twin props that rotate towards the ship's centre line when viewed from the rear.

A bit of waterproof threadlock helps keep the props on the shafts too.
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