Well, I've been experimenting with this and have got a drive that'll do 25G with about 95% reliability, however she is far more restrictive than the others I see here. Anything more than 4 command seats, 4 RTGs and a small cone adapter on the front cause 100% failure, cant be launched in-atmo and she screws up the launch vehicle requiring any crew to be brought up separately. Interesting actually requires 3 of the 4 legs to break to work, anything else causes horrible spins or just one 400m/s pulse. Interesting bit of information, putting on physics warp doesn't actually change the rate the speed numbers go up. Therefore 4x warp actually reduces acceleration 4 times, although the G indicator acts like the acceleration has gone up 4 times. Under real time the imbalance caused by the 3 broken legs means she can't quite hold a heading, setting 3 or 4 times warp allows it to, meaning she's actually easier to steer under physics warp. Here she is on the way to Eeloo, still inside Duna's orbit, with Eeloo one and a half days away. 30 odd minutes were wasted trying to get crew on her, but Jeb accidentally fired the de-orbit engines before transfer. Makes you realise how fast the speed of light is, after 1 hour of thrusting it still hasn't reached 0.003C.