Estes MaxTrax info

I have a couple Max Trax rockets with the digital altimeter on it from
Estes but I don't have any instructions for them. I was wondering if
anyone knew where to get them or knew how to operate the altitude
avionics on it. I've launched it 4 times and I guess I accidentally had
it right the first time, but never since then have I been able to get an
altitude reading. Any info on the physics and electronics inside these
neat discontinued suckers will be greatly appreciated.

- Thanks

"Ian" <(E-Mail Removed)> wrote in message
news:4a8cc94c$0$23745$(E-Mail Removed) ...
>I have a couple Max Trax rockets with the digital altimeter on it from
>Estes but I don't have any instructions for them. I was wondering if anyone
>knew where to get them or knew how to operate the altitude avionics on it.
>I've launched it 4 times and I guess I accidentally had it right the first
>time, but never since then have I been able to get an altitude reading. Any
>info on the physics and electronics inside these neat discontinued suckers
>will be greatly appreciated.
>
> - Thanks

Have a look here - is this it?

http://estes.aptinet.com/images/maxtrax.pdf