L2 Post-Flight Analyses

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Revision as of 03:15, 23 March 2016 by Rwong (talk | contribs) (→‎Rocket Specs: added description of rocket set up)
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Cardinal II

Flight Summary

Date of Flight Feb. 6, 2016
Launch Location LUNAR
L2 Certification Attempt? Yes
Launcher Ian Gomez
Recovery Status Recovered


Rocket Specs

Manufacturer Giant Leap Rocketry Firestorm 54
Length
Weight
Motor
On-Board Avionics Featherweight Raven 3
Payload 18" drogue, 36" main parachutes

Analysis

The data from the Raven can be found on the Google Drive here

JARVIS I

Flight Summary

Date of Flight Feb. 20, 2016
Launch Location TCC
L2 Certification Attempt? Yes
Launcher Rebecca Wong
Recovery Status Recovered, minimal damage to airframe

Rocket Specs

Manufacturer Giant Leap Rocketry Firestorm 54
Length 69"
Weight 5.1 lbs
Motor Aerotech J425
On-Board Avionics Featherweight Raven 3
Payload 18" drogue, 36" main parachutes

The rocket was configured with the drogue chute located in the aft airframe and the forward chute located in the forward airframe with the aft airframe friction fitted onto the avionics bay. The Raven was programmed to fire a charge for the drogue chute at apogee (barometric), a redundant charge at apogee + 2.5 seconds -- the time determined by OpenRocket that the rocket would have fallen 100 feet -- the main charge at 600 ft, and a redundant charge at 500 ft. Each charge well contained 1.5 g of Pyrodex.

Analysis

JARVIS I marked the 2nd attempted rocket flight with on-board electronics for the 2015-2016 year. Flight takeoff was nominal, however, at apogee, the drogue parachute did not deploy, nor did the main chute deploy at any lower altitude. Upon recovery, it was determined that the nose cone was ejected, which helped to increase drag substantially so the rocket did not lawn dart but fell laterally instead. The Raven was operational even after recovery, and the data retrieved from the altimeter concurred with the physical evidence that all ejection chargers successfully fired. The most reasonable hypothesis for the parachute ejection failure was that the size of the ejection charges was simply undersized.

The data from the Raven can be found on the Google Drive here