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Author Topic: What propshaft angle! Advice please..  (Read 4934 times)

Paul R

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What propshaft angle! Advice please..
« on: November 16, 2010, 11:06:05 PM »

Hi... I'm importing a riva style wooden model boat via ebay from vietnam, youv'e seen the ones. Its a planing hull not fitted for RC although the boat is ready to take RC conversion. What I need is some advice on installing  the propshaft. Model is 26" in length and I'm wondering what angle to install the propshaft at in relation to the bottom of the hull?? The boat is a riva aquarama.  Any other advice on rc installation would be welcome.

Thanks
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Brian Adley

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Re: What propshaft angle! Advice please..
« Reply #1 on: February 23, 2011, 11:19:27 AM »

Hi Paul,  I am not an expert, but I would say the flatter (more horizontal) the better from a thrust point of view.  In a boat such as a tug (speedboats may be different for various reasons like forcing the noze down etc) you want as much of the thrust to act horizontally as possible to get as much efficiency as possible out of the available thrust from the propeller.  This means that your motor must be as low as possible, or you must use an offset drive by gears or belt. They also have a drive called a "z-peller" I think, which is a steerable offset drive.  Hope this helps.
Brian
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Arrow5

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Re: What propshaft angle! Advice please..
« Reply #2 on: February 23, 2011, 12:08:39 PM »

Get advice on flex-drive systems from people like Astec.  This system can give a parallel to bottom of hull drive.
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Tutssy

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Re: What propshaft angle! Advice please..
« Reply #3 on: February 23, 2011, 03:24:39 PM »

Why not take a look at the Riva web site & maybe email them.  I would have thought that if anyone should know all the angles, they should.

Al
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Arrow5

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Re: What propshaft angle! Advice please..
« Reply #4 on: February 23, 2011, 05:00:24 PM »

Hmmm, do you mean Riva full size ?   Some things don`t work at model sizes as they do on full-size.
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Brian Adley

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Re: What propshaft angle! Advice please..
« Reply #5 on: February 25, 2011, 11:41:43 AM »

I believe Graupner or Robbe make Z drives.
Brian
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