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DX7 Spektrum yaw control setup

Old 01-27-2008, 09:55 AM
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timotsc
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Default DX7 Spektrum yaw control setup

I'm new to the DX7 and wanting help to setup what may be an unusual configuration, well something I can't figure out anyway.

The aircraft is a P38 so has 2 brushless speed controllers/motors, 2 lipo batteries, AR6200 receiver and controlled by ailerons, elevator & throttle.
The 2 speed controllers are connected together with a Y lead so I can only power both motors together. What I was hoping to achieve is yaw control using motor differential.
Is it possible to set the DX7 up so a motor will slow down/speed up relative to each other, controlled by transmitter rudder input but also the throttle stick work for both motors as per normal? (and still retrain aileron and elevator controls as well) I guess this is much like the cheap park flyers that have no moveable control surfaces relying on the twin engines for height and differential for yaw control.

I'm currently flying a mini Slinger using the radio gear from a Esky Lama 4 heli and figure I could use this radio much the same way if I wanted to go with 2 motors. The Lama has 2 contra rotating props which the speed of both are altered using the rudder stick so I figure this could also be configured in a twin engine fixed wing aircraft as well to, in effect have yaw control. (but not this P38 as the inbuilt speed controllers would handle the power I need)
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Old 01-27-2008, 04:31 PM
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Pinecone
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Yes, you have to do some mixes to get it to work.

Over and RCG there is info on teh exact mixes you need to set up.
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Old 01-28-2008, 10:02 AM
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timotsc
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Default DX7 Spektrum yaw control setup

I'm not sure what you mean by RCG. Can you supply a link?

Originally Posted by Pinecone View Post
Yes, you have to do some mixes to get it to work.

Over and RCG there is info on teh exact mixes you need to set up.
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Old 01-28-2008, 02:00 PM
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RCGroups.com

When I am over there, I will do a search for it.
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Old 02-01-2008, 12:09 AM
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Pinecone
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Feb 2008 issue of Model Aviation tells how to do this. Page 89.

You have to set up 3 mixes.

One throttle in the throttle slot (1 on JR/Spektrum), the other in Ch 6. Mix 1 (master) to 6 (slave ) at 100%. Mix rudder (master) to each 1 and 6 at about 30% with opposite signs (+30% 4 -> 1 and -30% 4 -> 6). If the wrong side speeds up (yaws wrong way) reverse the sign of the two rudder to throttle mixes or swap the connectors.
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Old 02-02-2008, 10:54 AM
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timotsc
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Thanks Pinecone - I'll try that out.
BTW this is a pic of the aircraft in Qn purchased from WattsupRC


Originally Posted by Pinecone View Post
Feb 2008 issue of Model Aviation tells how to do this. Page 89.

You have to set up 3 mixes.

One throttle in the throttle slot (1 on JR/Spektrum), the other in Ch 6. Mix 1 (master) to 6 (slave ) at 100%. Mix rudder (master) to each 1 and 6 at about 30% with opposite signs (+30% 4 -> 1 and -30% 4 -> 6). If the wrong side speeds up (yaws wrong way) reverse the sign of the two rudder to throttle mixes or swap the connectors.
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