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 | Ignition is very fast, and normal time from zero to full chamberpressure and thrust is typical 0.01-0.04 seconds. |
| The igniter itself is a dangerous device that must be handeled with properly care. |
| Different mixes of the propellant and motors give different needs of the igniter. |
| "Hangfire" sometimes happens. It is not fully understood why it happens, but hangfire is a unplanned delayed ignition. At a hangfire the igniter blow but is unable to fully ignite the motor, and for a couple of seconds the motor burn very very little and give no actual thrust. And after a few seconds (Up to 20 sec) it suddenly ignite with full power and act as normal. |
| Some propellantmixtures require that a burstingdiaphragm is inserted in the nozzle. This device burst when the pressure in the chamber has reached the minumum pressure needed for stable burning. Mostly used in low-percentage oxidizers mixtures (typical 60-65% AP). |
| The club developed a method to measure the actual characteristics of the diaphragm. |
Copyright (c) Raketgruppen IRA/UT 2004.
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