The cross-shape parachute

 

A 1.8m crosses form Ultra-X-type parachute from Top Flight Recovery has
been tested and found sufficient to meet SQUID’s requirements listed in
section 2, (see Figure 37). The parachute is made out of Ripstop nylon fabric,
which is the same as EuroLaunch uses to recover the REXUS rocket with. It
has a total of eight ropes, one in each corner, that are made out of reinforced
flat-braided nylon see Figure 37
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Figure 37 – The 1.8m size Ultra-X-Type Top Flight Recovery parachute.
Figure 38 – Close up on one of the corners and the parachute rope.
Coefficient of drag has been calculated, from the towing test runs with drag
measurement instruments on May 19, to be about 0.9. This gives the FFU a
final descent rate of about 6m/s (see the SQUID Towing Test report under
Appendix H – Experiment test reports).
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During the drop test conducted on August 24 the descent rate was measured
to be 5.5 m/s. This further supports the use of 0.9 as a drag coefficient for this
type of parachute (see the SQUID Drop-test Campaign Report under
Appendix H – Experiment test reports).
Top plate ejection system
This system consists of a cutter inside the eBox, a Spectra cord, a Kevlar
cord, two springs and the FFU top plate, (see Figure 39).
Before packing the parachute, the Spectra cord is guided through the cutter
and secured to the eBox by a clamp on the inside. The cord is two folded in
order to increase strength and provide a loop, just outside the eBox, where a
heat resistant, two folded, Kevlar cord loop can be connected. The two free
ends of the Kevlar cord are then guided outside, via a guide plate and a hole
in the frame to the top plate lock mechanism.

A 1.8m crosses form Ultra-X-type parachute has been tested and found sufficient to meet SQUID’s requirements. The parachute is made out of Ripstop nylon fabric, which is the same as EuroLaunch uses to recover the REXUS rocket with. It has a total of eight ropes, one in each corner, that are made out of reinforced flat-braided nylon

Coefficient of drag has been calculated, from the towing test runs with drag measurement instruments on May 19, to be about 0.9. This gives the FFU a final descent rate of about 6m/s. During the drop test conducted on August 24 the descent rate was measured to be 5.5 m/s while during the real flight of REXUS 10 the descent rate was estimated to be about 6.1m/s. This further supports the use of 0.9 as a drag coefficient for this type of parachute.