Initial design : Utilise chute release in a single ejection and dual deployment setup.
Issue: Chute release is not allowed for competition and is known to fail on parachutes above 48 inches. As plan was to use on 16 ft main chute, design was abandoned.
Second design : Utilising tender descender in place of drogue chute in new configuration. (Was plan until 28/01/2020
Issue: Tender Descender might not be as reliable as we initially thought it was.
- Past reports show that parachute tends to fall out of parachute bag early.
- Parachute staying in bag relies purely on friction fit
-
Based on shock cord lengths, uncertain of main chute will come out
Proposed solution: Fall back onto double BP ejection (two ejection event, one for each chute)
Third design
: Utilise black powder in a dual separation event system, 1 drogue chute to release main (release chute), and another drogue chute at apogee.
- Accounting for the fact that main flight computer needs to remain attached to bottom half of body tube for engine connection, it will be fixed to the bottom plate
- Dual thread setup for orientation locking
- Dual bulkhead set up as shown below to allow BP charges to be separated from electronic components
- +3cm vertical space needed for Ricardo’s antenna and bulkhead above it must be metal for reflecting signal
- 48 inch parachute now being used as drogue for lower shock loading
- Wiki detailing shock loading can be found here
- Ejection cap bulkheads are epoxied into the coupler section, and electronics boards can be worked on outside then inserted
- Manufacture 2 more of our own ejection caps
(Insert image of setup)
Knowledge gained from EARS launch to utilise for recovery can be found here .
Timeline:
29/01/20
https://slideplayer.com/slide/6927249/