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Author Topic: Prop rotation with 3 props  (Read 3171 times)

jaymac

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Prop rotation with 3 props
« on: August 30, 2012, 06:50:08 pm »
 basic idea with 2 props they  contra rotate  to   reduce  torque  steering  but what if there are 3 props .Am looking at a model  the guy says all props turn in same direction  is tis ok   bear in mind I'm  pretty clueless %)
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NFMike

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Re: Prop rotation with 3 props
« Reply #1 on: August 30, 2012, 07:13:35 pm »
I Googled a couple of pics - Titanic and a 'sub chaser'. Both appear to have the outers contra-rotating with upper blades moving outboard and centre same as starboard.
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Martin (Admin)

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Re: Prop rotation with 3 props
« Reply #2 on: August 30, 2012, 07:38:30 pm »
Titanic

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Martin (Admin)

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Re: Prop rotation with 3 props
« Reply #3 on: August 30, 2012, 07:53:03 pm »
Bismarck

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NFMike

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Re: Prop rotation with 3 props
« Reply #4 on: August 31, 2012, 06:11:14 pm »
Quote from: Mike on August 30, 2012, 07:13:35 pm
... and centre same as starboard.

... but of course Bismarck would have been left hand drive.
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jaymac

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Re: Prop rotation with 3 props
« Reply #5 on: August 31, 2012, 06:41:36 pm »
Quote from: Mike on August 31, 2012, 06:11:14 pm
... but of course Bismarck would have been left hand drive.

 Ha! and the Titanic would have been   better off if they had been fitted  the other end


Any road thanks but dont answer my query as to   what if al turning the same direction
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Umi_Ryuzuki

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Re: Prop rotation with 3 props
« Reply #6 on: August 31, 2012, 07:08:54 pm »
If all props turn the same direction, the you should have an ELCO PT BOAT...

 %)  %%

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Bryan Young

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Re: Prop rotation with 3 props
« Reply #7 on: August 31, 2012, 08:53:52 pm »
For what it's worth....a couple of years or so ago a member of TMBC had this problem.
Being a model (rather than the real thingy) I advised him to rig the centre prop so that it just free-wheeled. He tried this and the model behaved much better. BY.
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Notes from a simple seaman

jaymac

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Re: Prop rotation with 3 props
« Reply #8 on: August 31, 2012, 10:59:23 pm »
Its the Graupner Wiesel  if that helps
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Umi_Ryuzuki

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Re: Prop rotation with 3 props
« Reply #9 on: September 01, 2012, 01:18:15 am »
Actually it probably doesn't matter.
If the motors and ESC don't overheat, the boat should run fine.
It might turn one direction better than the other, but it is what it is.

 :-))
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jaymac

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Re: Prop rotation with 3 props
« Reply #10 on: September 01, 2012, 09:26:01 am »
Thanks Umi  I just wanted to know it would not be totaly useless. After all at least 2 have to go the same direction
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