Page History

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• Heavier (two separation systems vs one) and takes up more space
• No reliance on TDs
• Don't have to worry about main tangling while drogue is deployed
• How do we signal the dual deploy? (Wires don't swivel very easily, want to avoid having wires extend between deployment stages)
  • Load bearing avionics bay? Put the avionics bay in between the two deployment mechanisms?
  • Not all flight computers are created equal: put smol computers in the nose of each stage that are just there to actuate the first deployment

Parachutes: 

• Parachute Sizing

• Sustainer (estimated weight: 15.8 lbs)

• 1 drogue: 18 inch diameter (approx 1.16 oz 18, 6.4 in^3 packing volume)

   

• 1  main: 48 inch diameterdiameter (approx 7.5 oz, 41.5 in^3 packing volume) 

• Booster (estimated weight: 103 lbs)

• 1 drogue: 36 inch diameter (approx 3.3 oz, 18 in^3 packing volume)

• 1 main: 96 inch diameter (approx 25 oz, 139.5 in^3 packing volume)

• Goal terminal velocity: 30 ft/sec, main parachute Cd: 2.2

• Research on parachute manufacturers:

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Deployment Bags/Cloth:  

• Deployment

• Multistage recovery system

• Think about the snatch load - reduce snatch load by keeping it in a deployment bag or shell

• Should have two sections - a section for the canopy and a section for the lines - to reduce tangling

• Individual lines stored in individual sleeves to prevent tangling

• ****want lines first deployment

• Could put the lines in a bag and put the canopy inside a sleeve which is stored in a protective flap

• Material - fire-resistant Nomex (to shield parachute from heat of expulsion charge)

• Drogue shell?

• parachute liner as replacement?(Fruity chutes sells them lol)

• simplified parachute bag; good for CO2 deployment?

Lines: 

• Research into line materials:

• Currently technora; will co2 have any effect on the lines?

• Lines Diagram:

• Phoenix: https://wikis-mit-edu.ezproxyberklee.flo.org/confluence/download/attachments/147325224/Phoenix%20Lines%20Diagram%20Printout.pdf?version=1&modificationDate=1596563231000&api=v2 

• Line Sizing Resources
  • Hermes Webbing Line Sizing: Hermes Webbing Lengths

• • https://wiki.rit.edu/pages/viewpage.action?pageId=229713880
  • https://richsrockets.wordpress.com/2015/10/02/shock-cords/

Soft Goods Testing:

• What we want to test:

• Deployment and inflation behaviour of the parachute.

• Stability of the parachute throughout the entire flight envelope.

• Opening load of the parachute.

• Tensile Testing Procedure: https://docs.google.com/document/d/1-n-A-MbSnujLylDCPT35ef-At09ltjjxZ-DWiKTpzdI/edit

Soft Goods Failure Modes:

• Webbing failure modes: Hermes Webbing Failure
• LINE TANGLING!!!!
• TD failures
  • e-match shorting
  • wet black powder or TD isn't pressure sealed so black powder can't combust

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