Three Motors in a boat. (The boat, PT61, is quite heavy for a PT boat, actually an ex-PT boat. My model reflects the mid-war modification to add two 40mm Bofors, and twelve more 50 caliber BMGs, plus armor plating.)
Here how I wired my 47 inch (1/20 scale) PT boat:
The outer motors has its one battery. The outer motors run proportional control through the two ESCs. The center motor is controlled by a servo activated switch which turns the motor off and on from its own battery. No ESC so it is forward high speed only.
โ๏ธReasoning:
Backing this boat using two motors (or even just one) is sufficient. Don't need the center motor for this.
โ๏ธOperation:
Many model boat operators accelerate their boats too fast. Just push the throttle and the boat (especially the smaller ones) just jump out of the water. Even a PT boat will not go to a high speed in a few boat lengths. So I gradually push the two throttles up (not too slow, but to simulate good acceleration) then when up to speed flip the switch for the center motor to kick in. Same with backing down.
โ๏ธThree batteries?
As I use two standard hobby batteries, two fit better than one large battery and distribute the weight evenly. This way I can keep my run time up by maxing out the battery current (mAh). The 4.8V battery runs the receiver. This battery lasts a while so if one of the other two "motor" batteries runs down the receiver keeps working and I can get back to port using to good battery.
Runs great, "step on board" - here is a video:
https://youtu.be/WETa_834Ce8?si=tDLeNjWvZYQAUATF |
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