Max thrust takeoff in a KC135R model out of Bangor (go the Maineiacs), at -10C with only 4 hrs of gas onboard.......28 degrees NU (limited due fuel boost pump uncovering) accelerating, VSI pegged off the clock (6000fpm) and after commencing a 30deg bank turn at 500' thru 180 deg we were 10000' (yep 10K) going abeam the runway. Now that is a go machine....I don't think there is a heavy in the world that can outperform the R model, it is an absolute handfull at light weights.