The weird things was the igniter is what split the case. The propellant didn't even light.
I bet your right. Everything looked fine but that makes more sense.When you look at it, it may look like the propellant didn’t ignite, but it probably did and then snuff out immediately when the pressure inside the case dropped. It’s not unusual for propellant grains to look almost new following this kind of failure.
Thank you very much for filing a MESS Report!
I found a couple of Estes F50 motors like that on clearance at Hobby Lobby a few years ago. I never understood why Estes didn't package them with a starter. The starters Estes sold separately didn't work too good, and some were made so poorly they didn't fit thru the nozzle.
What did you use for a starter?
- and I would suggest you file a warranty claim with Estes for a replacement motor. Just click on the "Contact" button on the Estes webpage to get the email address, and send a note about what happened with a picture of the motor.
Andrew, to my understanding, the answer to your question is two-fold:
1. Yes, you can over-pressurize a motor by using too big of an igniter.
2. Rear ignition (end-burning) motors are very different from head-ignition motors.
In a typical APCP motor, the igniter goes all the way up into the core. When the propellant lights, there is no place for the exhaust to go but down and out through the nozzle. If the nozzle is blocked in any way, or if the speed of the burn is more significant inside the core than the nozzle can handle, you will get a cato.
In an Estes BP motor, the propellant is lit from the aft end and burns forward. Thus, you cannot over-pressurize an end-burning motor with too big of an igniter because the igniter is not inside the core, and the exhaust is not coming down from the top of the motor out through the nozzle.
Someone please correct me if I'm wrong. Thanks.
Estes C5 and B8 motors need blue igniter plugs. Tape, cotton, or a small piece of wadding should hold the standard Estes igniter in place. Remember, the igniter must touch the propellant. Black powder is the easiest of the propellants used in hobby rocketry motors to ignite. A Firstfire Jr. would be overkill for a C5.Whoa, that motor looks beat up!
Just a quick question for the experts, can you over pressurize a motor by using too big of an igniter?
I have some OLD Estes C5-3 motors, and I can't seem to ignite them with the Estes small motor igniters, what would happen if I tried a Firstfire Jr. igniter in it?