Going Gas Powered

Well, here goes. Taking the tank apart, pulling the electric motors, and swapping in a gas engine with a idler engaged pulley style transmission.  I’m tired of the 1hp from the electric motors, and not being able to have the tank really drive anywhere fun. Will probably go with a 3 to 6 hp engine in the back, and transmission in the front.

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Here’s the basic plan for the transmission.  The motor spins 2 shafts in opposite directions.  Each has a pully on each side, which can be engaged with an idler, giving the 4 options:  Left Forward, Left Reverse, Right Forward, Right Reverse.
TransmissionPlan

To turn the 2 shafts in opposite directions, the current plan is to have the chain wrap around a sprocket on each shaft, and an idler to give the proper clearance.
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The other option is to drive one shaft with the motor, and have it drive the other shaft in reverse via cogs/gears.  But I’m leaning toward the chain method.