In this episode, Josh shows us how to program a 6 channel transmitter for differential thrust. Differential thrust is used for twin engine planes to give better yaw authority.
We programmed the Graupner MZ-12, which is a versatile and easy-to-use programmable transmitter.
To program differential thrust, you’ll need a 6 channel receiver and a 6 channel transmitter with at least four mixes.
On the GR-12L reciever Plug the left motor into channel 5 on your receiver and the right motor into channel 6. Do not plug anything into your throttle channel.
Make sure you remove your props before setting or testing and electronics!
On your transmitter, go to free mix.
Inside the free mix tab, program Mix 1 to potentiometer (throttle) for channel 5. Go down to Mix 2 and select potentiometer (throttle) for channel 6.
Set Mix 3 to rudder for channel 5, and move over one section to the right to assign the rudder to a switch. Press enter and push the desired switch to “On."
Set Mix 4 to rudder for channel 6, and move over one section to the right to assign the rudder to a switch. Press enter and push the same switch used in Mix 3 to “On.”
When you flip the switch on/off, you should see the on/off position for both Mix 3 and Mix 4 change simultaneously on the transmitter screen. If it’s backwards, reprogram it with the switch in the correct position. Both switches need to be programmed so they turn on/off simultaneously.
Go back to Mix 1 and scroll over to the verse/travel adjustment. Go to travel and change it to positive 100%. Press enter to save. This will allow channels 1 and 5 to operate under the same parameters.
Scroll down to Mix 2 and repeat the exact same process, so that channels 1, 5 and 6 are all using the same parameters and move together.
Program the travel for Mix 3 to negative 100%. If the transmitter says that the mix is off, flip the switch you program to the opposite position, and you will be able to program the travel.
Program the travel for Mix 4 to positive 100%. When you increase the throttle, 1, 5 and 6 should move in the same direction simultaneously.
5 and 6 will move opposite of each other, this is the best visualization of differential thrust.
Hook up your motors to test it out, make adjustments as necessary, and you’re ready to fly!