mechman wrote:Hi Fred
I looked at that but the chain looks as though it runs over the axle of the middle set of wheels which would turn them in the opposite rotation assuming its 6 wheel drive unless the top run of the chain drives the middle set some how. Can't get me head round it.
I didn't look closely enough at the pic. You are quite right.
The drive sprocket must be behind the top of the centre wheel.
Would there have been room for a triple drive sprocket and another short chain, (which would be out of sight), to drive the centre wheel
It is a puzzle