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Posted by MikeHRC | Mar 15, 2018 @ 09:57 AM | 7,793 Views
As I mentioned in the XK K110 thread, I have bought one of Remlen's RX120 kits https://www.rcgroups.com/forums/show...postcount=4001

It arrived from the Ukraine in a week, which I was very happy with (our post can be awful), it was really well packed and looked really good, it looks very professional - more so than the donor XK K110 imho. I had already bought some parts for it (servos, tail ESC, links etc.) in anticipation.

The XK K110 uses a brushless main and a brushed tail motor - the RX120 has a brushless tail, driving a torque tube to the tail, the speed of the tail motor determines the amount of "rudder" the same as the brushed tail. I decided to start by sorting out the ESC for the tail rotor as I think that it might be the trickiest part of the build.

This is the ESC that I am using https://www.banggood.com/SUPER-CP-FB...r_warehouse=CN

It comes loaded with BLHeli, weighs 0.7g and is only about 5 ($7) - I have wired it up with a servo connector so that I can easily connect / disconnect it while setting up, the other connector takes the power in and the PWM signal. As we know the K110 usually has a brushed tail motor, but Remlen had worked out how to get a PWM feed that could be used with the BG ESC. To get the PWM input you need to solder onto one of the pins of one of the surface mounted chips - I was concerned about this but it all went smoothly, picture of modification below - I also used the secondary power connectors on the board...Continue Reading