Thread: Project PHOENIX
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  #233  
Old 25-02-09, 14:03
Snowy Snowy is offline
Steve
 
Join Date: Sep 2007
Location: Brisbane, Oz
Posts: 113
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A block that size would have enough room for an esky and a go-go dancer

Having spent many, many hours investigating and calculating Weasel track geometry involving track pitch, sprocket tooth contact PCDs and whatnot, my five cents worth is, a full track-laying vehicle is not quite the same problem as a half-track laying vehicle.

To start with the correct calculations for a halftrack tyre versus halftrack sprocket, the circumference of the tyre must be known (obviously) but the sprocket diameter must be taken not at the PCD of the tooth / grouser contact point but at the outer (road) surface of the track face. That's because that amount of road distance passes around the sprocket every revolution, which of course must be ratioed to the tyre cirumference via diff or other gearing. I don't know what this distance is for carrier track but I would estimate 1/2 to 1 inch increase in radius perhaps, from the contact point to the road surface point. But I'm sure you guys already knew this

Steve.
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