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I preparation for the Orbiter Rocket Racing League, I felt it necessary to begin honing my technique for this particular flight (KSC -> ASC). I'm happy to report that after a number of tries, I successfully made the flight. Though, I have to say, Altea is not going to be happy... three of their new XR2s are now at the bottom of the ocean in pieces.
Take Off
Take off was from KSC using one of the Skin scenarios with the XR2. At loaded my payload bay with some main engine fuel and unloaded the other two slots. I then punched the throttle, rotated shortly after Vr, and immediately came to heading with Ascension. After lining up, I cranked back on the stick in order to get some altitude under me.
ScramAfter achieving Mach 3 and 40-50KM, I opened up the SCRAM doors and punched the throttle there. Why so early? Turns out you won't use the entirety of the fuel as it is. Might as well burn it.
Cruise
I managed to get into a suborbital trajectory at 80 KM with a speed of 6.8 KM/s. I opened the payload bay doors, dumped my fuel container (now empty), and opened the radiator for a bit. I also dumped the rest of my SCRAM fuel, deciding that the wieght reduction would help more with reentry.
Reentry #1
Things began to heat up here and I managed to reduce my speed to about 5 KM/s. At this point I was really getting pretty close to ASC, so it was about time. I was sitting at 60 deg AOA for most of the re-entry, primarily because I found I was getting too hot and the only way to counter that was to punch the throttle and reduce descent rate. It worked out, however, and I survived. Not without a few of the temperature readings going red for a few seconds, however...
Reentry #2
After coasting a bit, I began to reenter again. By the end I had my speed down to about 3 KM/s or so. Somewhere in the middle of this re-entry I had to pull the same nose-up trick and hit the throttle to save myself. I didn't quite manage it and took a fair amount of structural damage on the port wing, including the aileron (this actually failed and went gimpy on me). Limping now, I managed to line up with the runway some distance off.
Final Approach and Landing
Bouncing around with my broken wing made things a bit harder, but ultimately I managed to keep my speed up around Mach 2 and my altitude around 5 Km for the remainder of the flight. As soon as I got into range with the ILS, I let the throttle out and began descent. Landing was a bit difficult, as I didn't have a left aileron to assist in bank, but I stilled touched down slightly left of the center line and headed mostly straight. Airbrakes were out of the question, as the left brake would not deploy. I did scoot off the runway at the end, but I put that down to my vessel's steering and not my piloting.
Ulimately, I made the run in 2190 seconds. How does that compare to anyone else's run? Also, does anyone see any way I can improve my flights?
I found the biggest challenge was keeping speed as high as possible (hence flying above the atmosphere for most of the trip) while also taking into consideration the immense thermal issues you see in the XR2 on this kind of flight. It's all about energy management.
Ultimately a great flight that really challenges you to go fast (but not too fast). I'm looking forward to working on getting that time down!
Take Off
Take off was from KSC using one of the Skin scenarios with the XR2. At loaded my payload bay with some main engine fuel and unloaded the other two slots. I then punched the throttle, rotated shortly after Vr, and immediately came to heading with Ascension. After lining up, I cranked back on the stick in order to get some altitude under me.
ScramAfter achieving Mach 3 and 40-50KM, I opened up the SCRAM doors and punched the throttle there. Why so early? Turns out you won't use the entirety of the fuel as it is. Might as well burn it.
Cruise
I managed to get into a suborbital trajectory at 80 KM with a speed of 6.8 KM/s. I opened the payload bay doors, dumped my fuel container (now empty), and opened the radiator for a bit. I also dumped the rest of my SCRAM fuel, deciding that the wieght reduction would help more with reentry.
Reentry #1
Things began to heat up here and I managed to reduce my speed to about 5 KM/s. At this point I was really getting pretty close to ASC, so it was about time. I was sitting at 60 deg AOA for most of the re-entry, primarily because I found I was getting too hot and the only way to counter that was to punch the throttle and reduce descent rate. It worked out, however, and I survived. Not without a few of the temperature readings going red for a few seconds, however...
Reentry #2
After coasting a bit, I began to reenter again. By the end I had my speed down to about 3 KM/s or so. Somewhere in the middle of this re-entry I had to pull the same nose-up trick and hit the throttle to save myself. I didn't quite manage it and took a fair amount of structural damage on the port wing, including the aileron (this actually failed and went gimpy on me). Limping now, I managed to line up with the runway some distance off.
Final Approach and Landing
Bouncing around with my broken wing made things a bit harder, but ultimately I managed to keep my speed up around Mach 2 and my altitude around 5 Km for the remainder of the flight. As soon as I got into range with the ILS, I let the throttle out and began descent. Landing was a bit difficult, as I didn't have a left aileron to assist in bank, but I stilled touched down slightly left of the center line and headed mostly straight. Airbrakes were out of the question, as the left brake would not deploy. I did scoot off the runway at the end, but I put that down to my vessel's steering and not my piloting.
Ulimately, I made the run in 2190 seconds. How does that compare to anyone else's run? Also, does anyone see any way I can improve my flights?
I found the biggest challenge was keeping speed as high as possible (hence flying above the atmosphere for most of the trip) while also taking into consideration the immense thermal issues you see in the XR2 on this kind of flight. It's all about energy management.
Ultimately a great flight that really challenges you to go fast (but not too fast). I'm looking forward to working on getting that time down!