AT G78-7G failure to ignite, questions.

[DizWolf]

During a recent launch I had a G78 fail to ignite. Both times the ignitors fired. Right after the second failure, I swapped out the motor for another G78, and it took off just fine.

First fire jr:

result: no launch.

Copperhead:

result: no launch.

swapped motors:

Result: launch.

Not sure what's up...or if the motor is useable. I'm new to composites, so I don't know if I'm missing something here. My plan is to shove a rod inside and scratch it up, but wanted to check here first. Thanks for looking.



the whole sequence: https://www.flickr.com/photos/31757945@N05/sets/72157627948227966/with/6268087494/

 

[Pantherjon]

That might do the trick(the roughing up of the grain)..Greens ARE notoriously hard to light sometimes..Surprised the Firstfire didn't light it:eyepop:

I would go ahead and file a MESS report through NAR and drop an e-mail to Aerotech about your problem..Who knows AT MAY send you a new motor!

 

[n3tjm]

First fires are decent igniters, but sometimes you need something hotter. Barium Nitrate absorbs moisture out of the air quite quickly; that will make the motor harder to light. Look around to see if anyone has any magnelite or quickburst igniters you can use.

 

[troj]

It's a green, that's not uncommon, especially as they age.

-Kevin