Seeing the Launch getting cancelled with shifting blue skies did not make us very confident when we woke up early in the morning and realized it was snowing. But the winds were calm the only problem was the bad sight that could affect the recovery of the rocket. The major part of the team came to the radar hill a few minutes before 5.30 am (the rest had to stay at the ground station).
Not too convincing weather |
At 5.30 there was a planned hold for 15 min in the countdown to await the launch window and examine the weather conditions.
Fortunately we could see the haze decreased and the weather got clearer simultaneously as the winds remained calm – we began to hope. At 5.45 the announced that the countdown could be resumed and now we know that only critical weather changes could stop the countdown.
The upcoming 15 minutes were very exciting and nervous:
T - 10m Experiment power is switched on.
T - 8m SOLAR is armed and ready for launch
T - 2m We confirm our readiness for flight
T - 0 Lift off!
T - 8m SOLAR is armed and ready for launch
T - 2m We confirm our readiness for flight
T - 0 Lift off!
So the launch did happen and can be seen here:
At this
moment the Esrange crew had done their job and the quality of our still had to
be proven:
T + 90s
Soldering starts
T + 600s End of flight.
T + 600s End of flight.
So far so
good, the soldering had been performed. But how about the pressure in our
chambers? To call the flight successful we had to get vacuum in the vacuum
chamber and not lose too much pressure in our pressurized chamber. Regarding
the pressurized chamber we hoped for a pressure drop less than 20% ideally
below 10%. The results were visualized directly in our ground station:
SOLAR Ground Station - revealing the first flight results |
As seen in
the pressure graphs the experiment performed really well. The pressure dropped immediately
in the vacuum chamber and in the pressurized chamber the pressure did not drop
but INCREASED (due to the increased temperature during the soldering).
The (so far)
very successful flight was celebrated with a champagne breakfast while the
recovery mission started. We still had one concern; had all samples been
melted?
After
roughly 2.5 hours the helicopter landed on Esrange again carrying the rockets payload.
Due to a
main parachute failure and a landing in 35 m/s the nosecone of the rocket was a
bit demolished as seen in the picture, but fortunately all experiments had survived
the flight.
The REXUS 13 payload immediately after the recovery |
"I think you belong to Gryffindor Team SOLAR"
The rocket
was disassembled and we could soon start our own disassembly. We opened the chambers
one by one and found the following results beneath the hats:
Results for pressurized chamber - looking good! |
Results for vacuum chamber - looking good! |
As you can
see all samples melted as planned and a successful flight was a fact. You can
also see how the samples looks like before and after flight here
During the
evening we had dinner and a hilarious launch party, which can be summarized
with one picture: