gcanroc
Custom title
Last November I fail to achieve my Level 1 cert when my PML Spitfire went ballistic into the ground after launching on a Aerotech H283ST motor with a non deployment of the nose cone and parachute. Through the winter and through much of the COVID lock-down, I constructed a ebay which contains a Eggfinder Quantum. For me to salvage the rocket, I had to cut off 7" from the top of the body tube where it was split by the nose cone when it "arrowed" into the soft ground. This leaves me 29" of body tube to have the PML piston, shock cord, ebay coupler and parachute packed together. There will be only about 1-2 inches from the top of the shock cord above the parachute to the bp charge well when it is all put together. My goal is to have a redundant deployment system of the motor deployment firing and/or the ebay firing for my Level 1 cert.
Questions:
1) Is there a recommended clearance between the BP charge well and the packed shock cord/parachute.
2) Do you only use a "plugged" motor when using a ebay duel deployment BP system?
3) Should the motor ejection charge fire first and fail, is there a possibility of the ebay charge dissipating through the rocket because the motor is not plugged if I were to eliminate the piston. Would the packed parachute be enough of a blockage to contain the pressure build-up.
To make more room I can eliminate the piston. I'm anxious for our flying season to start. Thx for the input in advance.
Geoff
Questions:
1) Is there a recommended clearance between the BP charge well and the packed shock cord/parachute.
2) Do you only use a "plugged" motor when using a ebay duel deployment BP system?
3) Should the motor ejection charge fire first and fail, is there a possibility of the ebay charge dissipating through the rocket because the motor is not plugged if I were to eliminate the piston. Would the packed parachute be enough of a blockage to contain the pressure build-up.
To make more room I can eliminate the piston. I'm anxious for our flying season to start. Thx for the input in advance.
Geoff
Last edited: