Planes > F3A

New Project - Contra rotating Propeller Drive

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Happy Days:
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

Brian:
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

Happy Days:
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.

Brian:
''Yes Keith'',
Thank you.
I must find how to do that.

Brian

erwan:
Great :D

Which sound as this EP ??

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