The Shuttle PEG rewrite is here:

• https://github.com/lamont-granquist/MechJeb2/releases

Due to PEG's issue with 45 degree phi clamping, I've been rewriting it with a proper trajectory optimizer.

Phase I:

• do all the existing use cases properly without bugginess, using better guidance
• bring back the old node executor functionality (that was gone in all my PEG builds) as a fail-safe
• support principia node execution without tight integration
• single optimized coast phase between booster(s) and upper stage

Phase II:

• proper launch to rendezvous planning without prelaunch
• keplerian targeting of arbitrary orbital elements, and setting them to track a target or manually entered
• launch to match LAN of target (without matching all the rest of the target's elements)
• launch now, but match LAN (maybe with porkchop plots?)
• rendezvous with offset of distance or true anomaly
• atmospheric variable ISP effects (take into account surface ISP)
• teach the optimizer about the g-limiter
• add a trivial drag model (no lift, no mach effects, acts axially opposite to thrust)?
• suborbital hops targeting altitude + inc/LAN while maximizing velocity, terminating at a stage and fully burning it
• tight integration with principia's predictions for N-body accuracy

Phase III (wishlist):

• direct ascent to moon
• direct ascent to interplanetary
• one button launch to GEO
• aerodynamics with path constraints in the optimizer
• optimized launches through Eve's atmosphere
• analytic coast phase integration
• analytic thrust integrals for first-pass rapid optimization
• better numerical jacobian which is not O(n^2) with the number of stages
• parallel threading for the integrator / jacobian calculations

Other Misc Fixes:

• support autostaging hot staged engines
• fairing deployment manager
• manual textbox for launching at a window in the future (warphelper integration with ascent API)