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----- Original Message -----
From: "John Guy" <john-at-tankcommand.org>
Sent: Tuesday, December 09, 2003 5:46 PM
Subject: RE: Question
> Hello folks,
> Just a quick entry from a guy who mostly sits on the side lines wishing
> he had time to build one of these fantastic models!!!
> With regards to the front / rear sprocket debate, rear sprockets have a
> couple of major advantages.
> Firstly, rather than bringing the gearbox to the driver, meaning
> obtrusive drive shafts running the length of the tank, engineers
> discovered easier ways of taking the control inputs TO the gearbox, this
> put all of the drive train in one area of the tank, the design of ever
> smaller engines making this easier during WW2. the panzer 4 had the rear
> idler were it was (protruding from the rear of the chassis) because of
> the front sprocket, not vice versa.
> Also, and this is just an educated (badly!!!) guess on my part, when you
> consider how the track behaves when the vehicle is moving forwards, ie
> oscillating up and down as it returns forward over the return rollers,
> on a front sprocket tank the track is very unstable when it gets to the
> Compare this to the rear sprocket tank, and on all but the roughest
> terrain, the track is "presented" to the sprocket at a much more
> consistent angle, and a much more consistent tension, meaning more
> efficient engagement with the sprocket.
> Also, a tank track is a "pulling" drive train, not a pusher, so for
> maximum efficiency, the "pull" needs to be as close to the surface it is
> trying to move over as possible, and again the rear sprocket, when used
> for forward motion, achieves this much more directly.
> For any of you guys still awake after my mini - novel, keep up the
> fantastic work, I really will get around to building something someday,
> but www.tankcommand.org keeps me busy.
> Theres a thought, does having 15 1/16th scale tanks equal 1 1/6th scale
> (England, Rugby World Champions 2003)
> (DAMN proud!!!!!)
> -----Original Message-----
> From: tanks-admin-at-rctankcombat.com [mailto:tanks-admin-at-rctankcombat.com]
> On Behalf Of Frank Pittelli
> Sent: 09 December 2003 14:58
> To: tanks-at-rctankcombat.com
> Subject: Re: Question
> Jaakko Kukkohovi wrote:
> > I thought of making the tank rear drive. Is there any advantages or
> > disadvantages for having rear or front drive?
> Having built front-drive myself and seen the rear-drive used in the
> Russian tanks, I would give the advantage to rear-drive. In the Russian
> tanks, for example, it is easier to fit the drive assembly into the rear
> section, and I think that is true for most tanks. On some tanks,
> however, like the Panzer IV, the rear axle doesn't actually go through
> the hull, so it would be difficult to drive that axle. The Tiger
> doesn't have that problem, so you can drive it from the rear if you want
> without too much trouble.
> As far as actual battlefield performance, there doesn't seem to be any
> difference one way or the other.
> Frank P.