Launching AT rockets w/o AT launch controller

I'm getting back into rocketry after many years ago launching a bunch of littlish rockets. I've been launching some Estes kits and rockets
built from Estes parts in on D's, and want to get into the mid powered E/F/G range. I'm checking out the kits from Aerotech and really like what I see.
Anyway, I'm on a bit of a budget (I've got another rather expensive hobby already) and am going over what I've going to need. Right now, I've got a suitable launch pad, I know what I'm going to have to get in the motor department. However, I'm rather hesitant to drop about $50US on AT's "official" launch controller. I've a standard Estes 6V one, however.
Now perhaps I'm just undereducated in the workings of model rocket engine ignition, but it seems easy enough to make an external battery pack to deliver the 12V potential through my Estes controller. Perhaps this I might break the controller's light bulb by doing this, but outside of that, this seems to me like it should work.
Am I completely (or partially) wrong in this conjecture? Is there a special characteristic that the "official" 12V launcher might have that could not be reproduced using a modified Estes 6V controller? Or, am I better off just putting another shift in and plopping the cash down for the "real" controller?
Thanks for any input.
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Brian W wrote:

There's nothing magic about the Aerotech controller - many people have upgraded "model rocket" controllers for higher voltage... as you note, the light bulb voltage may need to be changed (and it's probably a good idea to replace a light bulb type continuity check setup with a low current LED+resistor circuit)... you may need longer wire out to the pad for the greater recommended "safe distance" for firing the larger motors, but you can buy a lot of 16/2 gage SPT-2 (heavy duty zip-cord or 'speaker' wire) for the price you're seeing for the Aerotech system.
-dave w
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On 11 Jul 2004 20:00:32 -0700, snipped-for-privacy@umn.edu (Brian W) wrote:
<snip>

It's easier to use your estes controller to energise a 6v relay to connect a separate 12v battery to your Aerotech igniter.
--
Darren J Longhorn http://www.geocities.com/darrenlonghorn /
NSRG #005 http://www.northstarrocketry.org.uk /
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