Author Topic: New Project - Contra rotating Propeller Drive  (Read 13722 times)

Brian

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New Project - Contra rotating Propeller Drive
« on: October 25, 2011, 23:36:34 PM »
Hi,
Test


Brian
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Brian

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New Project - Contra rotating Propeller Drive
« Reply #1 on: October 25, 2011, 23:39:55 PM »
Some more;




Brian
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Brian

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« Reply #2 on: October 25, 2011, 23:43:21 PM »
Still more;



I will post some more in the morning with some detail about the model and drive system.

Brian
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GliderIreland - Ireland RC Forum - Flying Model forum in Ireland

New Project - Contra rotating Propeller Drive
« Reply #2 on: October 25, 2011, 23:43:21 PM »

Brian

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New Project - Contra rotating Propeller Drive
« Reply #3 on: October 26, 2011, 09:42:28 AM »
Hi;
A few more pic's;



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Brian

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« Reply #4 on: October 26, 2011, 09:59:42 AM »
Hi,
The last few for now anyway;





This was designed and built as a GP model.
I converted it to EP.
I cut the battery hatch out and repainted it having cut back the front to remove the right thrust and to increase the spinner size from 75mm to 82mm.
The Contra drive is made in the USA by a guy called Brenner Sharp.
See ; http://www.rcuniverse.com/forum/m_9833118/mpage_1/key_/tm.htm
We made contact with him in Sept 2010 and got CTU's in Mar 2011.
I have flown with it all this season and I am really enjoying my flying fight now thanks tho this.

Brian
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Happy Days

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« Reply #5 on: October 26, 2011, 10:16:19 AM »
Well the model looks very attractive Brian. :clap:  I know you Old Boys have to fly the slower Biplanes as your reaction times slow! :lol:

But I do hate it when people use jargon, don’t you?

So what is a CTU????? :!:

And……
How is the contra rotating made to happen? It’s all very well saying it happens, but HOW. :?:
Let’s see some pictures of the contra prop workings please. :D

(I hate it when people only tell you half the story :evil: ).

Guess I’m just a grumpy old man,….Well no, just a grumpy man actually, you can forget the ’old.’ :roll:

Keith
Try not to run out of airspeed, altitude and ideas....... all at the same time.

Brian

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« Reply #6 on: October 26, 2011, 11:09:16 AM »
Hi Keith,
There I was thinking I was dealing with some 'tech heads' , ah well.
CTU ;customer test unit !.
As for the other more substantial question, you are correct you are a grumpy old ???? and hasty too.
This is very complex to explain so I put in a link to Brenner's RCU thread where it is all laid out so even you can understand it.

Thanks for all the help with the photos.

Brian
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« Reply #7 on: October 27, 2011, 08:18:25 AM »
Jeezzzzz Brian! it takes forever to wade through all those other postings. :evil:
 So to save anyone else from having to read all the irrelevant ramblings from that forum, here are the salient features of the contra rotating props system that is powering your model.  :wink:

A single inrunner motor


A "SEE THROUGH" diagram

And one more image


There, aren't I good to you!
(At this point you're supposed to say "Yes Keith." ):roll:

K.
Try not to run out of airspeed, altitude and ideas....... all at the same time.

Brian

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« Reply #8 on: October 27, 2011, 09:13:02 AM »
''Yes Keith'',
Thank you.
I must find how to do that.

Brian
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erwan

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« Reply #9 on: October 27, 2011, 10:52:22 AM »
Great :D

Which sound as this EP ??
La mouche qui pète ..

Brian

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« Reply #10 on: October 27, 2011, 11:33:14 AM »
Hi,
If your question is, 'is this electric power'
Yes it is ,the motor is a Steve Neu F3A which is similar to a Hacker C5013XL but a bit more powerful.

Brian
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jumbo

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« Reply #11 on: September 18, 2014, 09:44:14 AM »
So I am guessing this stops rotation due to torque when prop hanging?