February 25, 2011 Leave a comment
After the successful launch of Rexus 10 we still have a lot of things to do. There is a lot of data stored on the FFU which will have to be analyzed in order to fully understand how the system has behaved and recover the scientific data gathered by the experiment. This data is stored in the memory inside the e-box and has not yet been extracted as the FFU was wet after landing in the snow, and as water and electronics dont like each other we decided to leave it drying.
But probably you have already seen the video we posted yesterday. The images are impressive, but the main objective of mounting the camera was to film the FFU in order to be able to check how the spheres were deployed. Unfortunately the experiment module was coning (it had a quite high precession angle) and the FFU was lost from the field of view of the camera after a few seconds. However, if one analyzes the movie carefully can extract some useful information. On the pictures you can see some snapshots taken from the camera shortly after ejection, when the FFU was still in the field of view. Of one checks the pictures from 2 to 7 can see the doors of the SCALE systems popping out gradually (all four of them) which means that the SCALE systems were in fact working, as the doors can only be released if the motor of the wire boom systems are working.
The FFU also appears later on in the video. It was however very far from the experiment module and details can hardly be identified. One can see it in the last pictures, on the bottom half of the photos close to the edge of the ejection spring (dont get confused by the brilliant thing appearing on the top of the photos, which is the nose cone of the rocket). We were unlucky enough to have the sun very close to the area on which the FFU was flying, so on the photos it usually appears as a shiny thing close to the spring. There is however a very interesting photo. If one checks the very last picture, one can see the FFU body very close to the edge of the spring and what seems to be two of the spheres close to it.
We do know that at least two of the spheres were deployed, as when we recovered the FFU two of the cables had been damaged during reentry, probably because the motors driving the wire boom systems could not overcome the centrifugal force during retraction and stalled, leaving the spheres on the free airstream, which ripped them off the cable. We will not know surely how they worked until we really process the data, specially from the sensor wheels on the SCALE systems and of the gyros and accelerometers of the FFU, but so far so good.