PVC: 27mm OD, 23mm ID, 110mm in length.
First Plug: 20mm of bentonite clay with a 3mm core.
Propellant: 50mm of propellant #1 (2x 2.5cm grains, 1st grain with a 3mm hollow core).
Delay: 5mm of delay #7.
Middle Plug: 20mm of bentonite clay with 3mm core.
Ejection: 10mm of ejection #1.
Last Plug: 5mm of bentonite clay.
Changes Made:
- Increased the amount of propellant to 50mm.
- Changed propellant type using cast moulds.
- Changed back to 5mm of delay #7.
- Core burning method.
Results:
The propellant ignited successfully, however the grain method produced too much thrust causing the first plug to explode. I believe it was the propellant that shot out of the motor and knocked the camera off its perch.
Although the propellant shot out of the motor, the delay ignited successfully and continued burning to the ejection which also ignited successfully. Unfortunately, there is no video footage to support this fact. It may be a good idea to increase the size of the nozzle next time or ignite the motor from the end and not the core.
