i was a tanker the army, in the 80's, and this is just too cool! i was on a m60a3. i can't afford one of those, but this, mebbe. what did you use for the tracks? i was thinking about something like this using torsion arm axles to make a modified christy suspension.
The tracks are industrial chain with a 5" pitch and a plate 8" by 4" was welded over each link using an angle iron bracket on each side.The gears are sheet metal spaced 5/8" apart, cut to match the chain.
It has a datsun 1800 engine, gearbox and diff.We are having teething prblems with one track at present but should be fully running in 2 weeks.Instead of a bren gun we are fitting a full size model 50cal browning.
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I'm sure he'd be excited to see your work.
http://www.youtube.com/user/Gizmo4t
Looks like it will be great fun driving around the neighborhood... at least BEFORE you attach the full size machine gun.
There ya go.
Oh, please post a full step-by-step!!