R/C Tank Combat

Tank #T040

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A flat assembly jig was needed to ensure correct alignment during the splicing operation. I used the partially completed track as a jig to build it.

The belt splice spans five track links.
 

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These are glued and nailed and then clamped overnight.

First test fitting of a completed track. Unlike a friction drive TTS this version has the "droop" along the top just like the real thing. Besides looking cool, the droop serves a purpose. It provides extra track length so the suspension can cycle over obstacles.
 

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This close-up of the outer cleats shows how I beveled the outer edges. It was done on the table saw after the track was assembled. This little detail allows easer neutral turning.

This removable block allows easer removal of a track. Once removed the front axle can slide back about an inch. The rubber piece offers impact protection.
 

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Here are all the major components of the turret assembly in place. This pic also gives a good view of the trigger actuator. The black device along the top is an automotive door lock actuator. When activated it pushes the attached slider to the left, which causes the cam to press the trigger down.

The marker pivots on what was once the front handle assembly of the Sheridan XTS marker. The handle was machined down to fit into a standard bicycle handlebar bearing set. The bearing set was epoxied into the wooden mounting block.

The Sheridan XTS is a single tube blow back design that offers a really compact installation. Unfortunately the XTS is no longer in production. This one was found at a surplus outfit.

 

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The other side of the marker mount. The machined handle passes through the bearing block and a round plywood disk is attached to it. Butted up against the plywood disk is a small aluminum drum that is attached to the elevate servo. A piece of 60-pound test fishing line is strung around these two items in a figure eight fashion. The fishing line is wrapped around the two screws locking it in place. When the servo rotates clockwise the fishing line pulls the marker down, counter-clockwise the marker points up. The aluminum bracket screwed to the turret base has a small bearing attached to it. The bearing fits inside the aluminum drum and keeps the drum and servo shaft from flexing. The spring is counter balancing the marker.

This device is bolted to the turret base and a standard pin-valved CO2 bottle screws into it. Once the bottle is seated the aluminum knob is screwed down to open the bottles pin valve. Backing this valve off closes the CO2 bottle and bleeds down the CO2 line going to the marker. A very handy device.
 

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