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because the XR-2 has such a powerful engine compared to a regular jet, I get up to V-1 and then throttle down to about 20%, take off, and retract at about 50 meters. Then I turn to my correct heading at a low (low for xr-2), speed to avoid wing stress, pitch up a little and kick the throttle. I climb at about 40-50 degrees to about 15km and begin leveling out and collecting speed for SCRAMs.
I use a slightly different method, mainly because the XR-2's wings don't generate very efficient lift at low speed.
At V1 I rotate to ~15°, raise the gear ASAP, and continue to rotate to ~50° while banking towards the launch heading. I sometimes get a gear warning just as the gear finishes retracting. If I have the joystick connected, I throttle down to 80% at V1.
Getting to higher altitude quickly is important because the main engines aren't as efficient in thicker air. You can save a fair amount of fuel if you can go ballistic on the correct heading as soon as possible.
I don't like to fly at large negative AoA, so I lower the thrust a bit to help level off at SCRAM altitude. You can even use bank to level out. Large negative Gs would be very uncomfortable for the crew/passengers.