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Yea, the stability seems a little off. I'll have to bust out my SMAD and SPAD (Spacecraft Mission Analysis (Propulsion) and Design) books to figure out exactly what is wrong.
If i had to guess, it would be CoP that is being miscalculated since it is more complicated to calculate and depends on how the atmosphere is modeled.
One thing I would like for them to do to make it more realistic is compute the aerodynamic forces on the vehicle and make it a parameter you have to monitor during ascent. If you end up accelerating too much in the lower parts of the atmosphere it could severely damage if not destroy your vehicle.
---------- Post added at 11:59 AM ---------- Previous post was at 11:02 AM ----------
Finished my first successful orbital mission! Didn't get too high 100.5 km with an perigee of 67 km. I think technically atmospheric drag would have de-stabilized my orbit well before I ended it at the 16 hour mark (I got to orbit then left for the night returned and was happy the little Kerbals were still in a good orbit). Did my deorbit burn using the handy orbit calculator. Landing was at 16 hours 3 minutes MET. Next thing I have to try is a precise re-entry to land them back at the Kerbal Space Center. (Or just off the coast).
My rocket was a fairly simple 3 stage tandem with solids plus the main engine being the first stage then the main engine all of the second stage. 3rd stage was a small service module fuel tank and propellant that I used to circularize my orbit and perform my deorbit burn. I still had about half of my fuel at SM sep that I could have used for orbital maneuvering during the mission so I think it was a pretty successful design.
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