During the previous days of the June 2014 launch of Rocksanne I-X, the Recovery Systems team has worked continuously with the aim to check all the changes and updates made on the parachute’s expulsion and tripping system in order to resolve the problem that we had encountered during the November’s 2013 launch of R-IX.
The main purpose was to verify the materials’ (used to release the parachute) resistance. The collected data was analysed totally in the C1 experimental laboratories of Politecnico di Milano University.
Particularly the Young’s modulus was researched, the stress and elongation at break of the following types of samples: the first one, realised in kevlar, used in the configuration to realize the lines of the main parachute (main); the second, realized with tubular nylon, mainly used to build the shock cord; the last, realized in nylon tube, in the configuration of connection between the bag containing the main parachute and drogue parachute.
The results obtained, as expected, brought out the mechanical properties of the expected loads in the launch phase with a sufficient safety margin. Below you can see a table with the data obtained from the tests.
|Material||Expected load [N]||Load at break[N]||Safety factor||Young’s modulus [N/mm]||Extension at break[mm]|
|Tubular Nylon (main parachute)||2060||7222||3.51||163||40.2|
|Tubular Nylon (drogue parachute)||6278||7323||1.17||180||38.7|