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Old Jun 12, 2012, 07:26 PM
Samurai KIIAAAAAAA
Screw's Avatar
Loganville, Ga.
Joined Dec 2006
307 Posts
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Twin Engine Rudder Mixing

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The question is how to program. I am wanting to set up a twin engine (electric) so that the engines throttle up normally together, but when givin left or right aileron, the appropriate engine loses power proportioned to the amount of aileron input I give it.

Any help wopuld be appriciated.

Just FYI, I am setting up a twin pusher configuation like a blimp. I want to use the motors as a rudder, but on my Aileron stick. I'm using a JR 9503 radio, 2 small electric motors 2208-17, 2 ESC (only 1 has a BEC).

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Old Jun 12, 2012, 07:30 PM
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pda4you's Avatar
USA, TX, Trophy Club
Joined May 2002
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Sorry re-read... Not sure on the JR
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Old Jun 13, 2012, 04:39 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,176 Posts
Try these threads -

Differential Thrust Set-up Help

Differential throttle-steering on an elec. twin

This one may save some reading -

The Twins: multi purpose cargo plane - and scroll down to post #116
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Old Jun 13, 2012, 08:10 AM
miniture aircraft pilot
rcshirt's Avatar
United States, FL, Tampa
Joined Oct 2007
1,334 Posts
oh your in for a fun time. most esc for aircraft are one direction 0- 100%.
so since you sticks center one will wan tot be at 50 all the time.
if it is a blimb.. i would get two small car/boat esc that go forward and reverse. now center stick can be 0 and you could drive it similar to a tank and mix the the ail chanell to the throttles.
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Old Jun 13, 2012, 08:21 AM
2^p - 1
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United States, MO, Springfield
Joined Feb 2003
1,327 Posts
Eflightray's links should help. What you're talking about is differential thrust, and you'll need a v-tail mixer. I have it on a couple of my twins and like it.
SAFETY ALERT! Be sure to setup with props removed!
Also, mine are coupled to the rudder. I'm not sure it would be wise to couple it to ailerons.
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Last edited by signflyer; Jun 13, 2012 at 08:27 AM.
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Old Jun 13, 2012, 09:25 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,176 Posts
Quote:
Originally Posted by rcshirt View Post
oh your in for a fun time. most esc for aircraft are one direction 0- 100%.
so since you sticks center one will wan tot be at 50 all the time.
if it is a blimb.. i would get two small car/boat esc that go forward and reverse. now center stick can be 0 and you could drive it similar to a tank and mix the the ail chanell to the throttles.
I don't think he actually wants to reverse one side, (I hope ), just add differential thrust. I have it on my Sunderland, (avatar), for better water steering mixed with rudder, works a treat.

Many very cheap toy twin planes only have the one RC channel, and steer using differential thrust, climb and descend using full and low power.
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Old Jun 13, 2012, 10:52 AM
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Chicago, IL
Joined Dec 2006
5,136 Posts
Here's how to do it on a Spektrum DX7, which should be similar to JR:

http://www.rcgroups.com/forums/showp...0&postcount=64

P.S. - most mix the differential on the Rudder rather than the Aileron, since it affects the yaw more than roll-axis.
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Old Jun 13, 2012, 04:24 PM
Samurai KIIAAAAAAA
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Loganville, Ga.
Joined Dec 2006
307 Posts
Screw in

Thanks guys for the help, I'll read up on those post. No I am not using counterotating props, and yes I'm wanting to use the motors to steer left and right. Because I don't have a wing there are no ailerons, but I would like to steer with that stick rather than the rudder stick.

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