I installed a stand-alone Mixer Board into my single engine Cat to provide throttle reduction on cornering. Here is a link to the Mixer used:
https://www.banggood.com/DasMikro-RC...r_warehouse=CN
It must be noted that this board has an adjustment pot, with an adjustment range of 33-100%. 33% is far too high for racing and for single engine craft. I got around this by adjusting the D/R on the rudder channel down to the 35-40% then using mechanical advantage on the rudder linkage, by using a long arm on the servo and a short arm on the rudder. This forces one to turn down the D/R, or you'll hit the mechanical hard stops. The adjustment range stated for the Mixer is for 100% signal input range. So you can "cheat" this number by not using the full range from the Transmitter. I have an effective combination working on my Cat that yields a throttle reduction on rudder command of only 4%. The last time I ran it, this seemed to work pretty good. I hooked this setup into my Digital Oscilloscope and took some pics of the actual signals in the boat. This is a very inexpensive mixer solution and appears, with the correct overall boat setup, to be capable of yielding good results. NOTE: being a single motor boat, I just used on of the outputs from the mixer. This same board will work for dual motor boats as well. I will post a schematic of this device hooked into mu boat at a later date.
The first pic is Full Throttle with NO rudder. The second pic is full throttle at full rudder. The third pic is the installation. The fourth pic is NO throttle and NO rudder.
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