RC Tank Warfare community hobby forum

After brushing up on my physics, determining minimum torque for the inclines I wanted to climb, studying different motors and available gearboxes, and determining I needed 500rpm, I was surprised to find I already owned exactly what I needed. Some trusty Black+Decker drills I bought years ago seemed perfect. I ordered 2 more from ebay, both for only $30 shipped.

I needed at least 500rpm, and these output 550rpm with 65inlb of torque. This should be all I need for climbing even the steepest inclines. The stock board won't be up to handling the 10amps each needed, but I am working on my own motor controllers that will work with the 2.4ghz heng long board.

What a fantastic idea, and you get built in adjustable clutches.

I'm guessing you'll use the motor power output of the board to control a pair of power transistors.

Yes I'll be able to limit speed mechanically or at the very least prevent motor stall with the clutchs.

Yes, using some Mosfet's will let me have the same On/Off motor function like the orginal electronics. For now this is how I'm controlling it while I wait on the HL 2.4ghz stuff to arrive.

Hopefully, I can come up with a solution for a variable throttle.

I'll be following your motor controllers with great interest, I had wondered about using transistors or mosfet's to control more powerful motors with standard Heng Long electronics, but I also wanted the controllers to supply the motors with power from a separate higher voltage battery than what the Heng Long board used.

So my main battery is 12V. To run the HL board I will use a DC-DC step down converter 12V to 7.5V. They cost about $6.
Typically they are 3A - 5A max, with some going as high as 10A, so you can build in whatever level of protection by selecting one that handles your HL board without compromising it.

I started using them years ago when I wanted to wire a USB plug into the overhead light console on my 2005 Mustang so I could run a USB dash camera.

Now the motors could be directly connected to the battery, with Mosfet as the switch, and some form of current regulation to keep them around 10A max. I might utilize the drill electronics since they are already regulating the motors to the RPM I require.

Another option I will explore is using the DC-DC step down converters as current regulators for each specific motor. For example, coming off the stock 21st board is 12V to each motor, if were to install a 12V to 7.5V 5A between the motor and the board I might be able to protect the stock 21st board, but may loose a lot of speed in the process since I desire up to 10A for each motor.

Thank you again

Although I've had experience of motor speed controlling with transistors and mosfet's, from a single power source, I didn't have any other circuitry that needed a different voltage, and I was only copying from plans.

I'll look for those step down converters

My HL transmitter and receiver arrived. I began studying it to determine how I will utilize it with my 12V battery. I want to be able to throttle my motors for low speed operation and fine turning, but also have them kick in to e full 12V speed. To do so I tested the HL board to determine what I would consider my limits before it might suffer failure. It may be able to handle a lot more watts, but I stopped it when I thought I observed thermal runaway.

First Test is a Success! With exception of melting wires lol.