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Author Topic: Idiots guide to steering nozzles...  (Read 2270 times)

U-33

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Idiots guide to steering nozzles...
« on: January 24, 2017, 03:29:09 PM »

Spot of advice chaps, please..


I know naff all about steering nozzles, so I have a question for you expert types: am I correct in thinking that when using a tapered steering nozzle the narrow end is the water exit?
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Rich

K-157 Vepr. Akula-II (project 971U)
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ray123

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Re: Idiots guide to steering nozzles...
« Reply #1 on: January 24, 2017, 03:58:25 PM »

hi richard as per picture  'you did have it the right way around  O0


regards ray
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U-33

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Re: Idiots guide to steering nozzles...
« Reply #2 on: January 24, 2017, 04:00:23 PM »

Marvellous...thanks Ray, spot on.  :-))
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Rich

K-157 Vepr. Akula-II (project 971U)
---------------------------------------------------------------

~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Arissara

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Re: Idiots guide to steering nozzles...
« Reply #3 on: October 24, 2017, 03:21:42 AM »

The above post has been described very well.

tugmad

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Re: Idiots guide to steering nozzles...
« Reply #4 on: October 24, 2017, 08:04:21 AM »

Yes I agree ,BUT note that the nozzle is almost parallel internally, if it is too tapered you will get a water jet effect and possibly overload the motor, trying to compress the water flow outwards.
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boatsdelboy2

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Re: Idiots guide to steering nozzles...
« Reply #5 on: February 09, 2018, 04:49:16 PM »

Hi there
            I use a piece of 1/12inch plastic plumbing pipe and it seems to work very well.

Dave
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RST

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Re: Idiots guide to steering nozzles...
« Reply #6 on: February 10, 2018, 03:11:22 AM »

In real life they can be tapered internally or externally depending on application and follow std. aerofoil shapes.

...I'd wager what boatsdelboy2 says is pretty much OK for the majority of model boats.  I've certainly followed similar and so long as they're roughly shaped, I would doubt anyone would notice or see too much difference.

Rich
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roycv

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Re: Idiots guide to steering nozzles...
« Reply #7 on: February 10, 2018, 08:22:48 AM »

Hi I have made my own and just stay with a parallel tube.  I think the original shrouded prop was designed to reduce the wash in canals.  But the shroud does make the set up more efficient.  Then science gets involved!
Good luck anyway.
Roy
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nemesis

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Re: Idiots guide to steering nozzles...
« Reply #8 on: February 10, 2018, 05:57:52 PM »

According to fishermen who have had Korts fitted, it increases thrust (great for trawling) up to 10/11 knots, after that it is as usual. nemesis
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