Well the much awaited contest is this Saturday 6/18/11 and after more than a dozen test models and design tweaks I think I'm ready. The piston is working as it should (thanks Micromeister) after several false starts. Simulations show altitudes in the 560s and durations in the mid 30s but actual tests have had times in the low to mid 50s. I haven't been able to break through that 60 second barrier but I am satisfied with the performance that I have been able to acheive. Now all I need is the right launch conditions and the rest is in the hands of fate.
Any last minute contest tips and pointers would be appreciated. Winds are forcast to be 10-20 and temps between 101 and 105 at the feild.
I'd like to say thank you to everyone who has offered advice to this point.