Model Boat Mayhem
Mess Deck: General Section => Beginners start here...! => Topic started by: ttony47 on December 09, 2016, 02:23:22 pm
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RH or LH how do you determin which to use when you purchase a prop help so many questions when you start to build for the first time
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Most people go with a RH prop for a single prop. To be different (actually I made a mistake) I bought a LH prop for my first boat. I don't think it makes any difference for a single prop. I've had no problems anyway.
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RH props tend to tighten themselves onto the shaft in normal forward mode (which is good) - LH are always trying to loosen themselves.
If you're not confident with your locktite or locking nut, you may become stranded in the middle of the lake when the prop drops off.
Most times, you are only hitting reverse to stop at the water's edge - so if it falls off then it's not too much of a problem.
That's why I always go RH for singles.
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Sorry Plastic, you have it reversed. A LH prop is self-tightening going ahead. Imagine holding the prop just behind the end of the shaft. Start the motor very slow ahead (it is turning CCW/LH as seen from astern) and bring prop up to the shaft. It will screw itself up the shaft.
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Sorry Plastic, you have it reversed. A LH prop is self-tightening going ahead. Imagine holding the prop just behind the end of the shaft. Start the motor very slow ahead (it is turning CCW/LH as seen from astern) and bring prop up to the shaft. It will screw itself up the shaft.
Yes, you're right - I've been doing it wrong then :o(
Feel Stoopid. %)
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Which just goes to show that it doesn't really matter as long as it is done up tight enough in the first place!
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that all depends on which direction your left hand or right hand prop turns, I have seen both directions called either left hand or right hand depending on where you are in the world, and whether viewed from the front or rear, etc.
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That's why I specified looking at the prop from stern to bow. I do live in The Colonies where we use that convention. :-))
I did manage to lose a left hand prop one time. Going in reverse the prop hit a rock and unscrewed itself, despite having a tight locknut behind it. This was in less than a foot of water, and an hour's searching never found it. It was a Prop Shop prop, too, so not cheap to replace.
Ttony, back to your original question: LH or RH makes little difference going ahead, but if you are going to be reversing often, as in navigation or towing events, you want to consider "prop walk." That's the phenomenom that makes the stern kick to one side when the motor is in reverse. A LH prop (viewed from the stern) will tend to kick the stern to starboard, making docking on the starboard side easier.
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For metal to metal locking... Bondloc - Studlock, far better than threadlock, especially on parts where there will be vibrations (ie: props) this stuff will do the trick!
https://www.tool-net.co.uk/p-400778/bondloc-b27010.html?gclid=CjwKEAiAj7TCBRCp2Z22ue-zrj4SJACG7SBEDS85t2nSJVuUMGfWGHtS9yT5oJKxMfkKCagFf9iRahoCT5zw_wcB
(https://www.tool-net.co.uk/data/tools/b/o/BondlocBONB27010.jpg)