AT G76-7G deployment at burnout

This weekend I had my first early deployment in about 15 years. I've probably built a dozen of these 29/40-120 motors in the last year without any issues. My son's Ventris lept off the pad and then the chute deployed right at burnout. The rocket suffered from a 2-3" zipper. The tea bag shock cord mount held up and actually prevented the zipper from being any longer that it was. I believe I built the motor per the instructions. I took a picture of the delay end of the motor before I cleaned the case. It looks like the delay liner burned up the side. I'm not sure how that would have made the ejection charge go off. Maybe I didn't have enough grease on the o-ring?

How many flights do you have on that casing? Maybe the front closure leaked due to worn threads. Since you're a L2, my guess is that it's not anything that you did...

I had the same issue last year. Unfortunately I couldn't find the packaging, but the charge fired right at burnout.

First clip here: [video=youtube;GqDspmZ5zUU]https://www.youtube.com/watch?v=GqDspmZ5zUU[/video]

Nate

I'm no expert on this but have flown a small number of the G76 Greens with good success. From your photo it looks like the is a snake like "soot trail" up the side of the delay grain insulator as if the fire managed to travel up the side. Weird?

Thanks for posting.

tmacklin said:

I'm no expert on this but have flown a small number of the G76 Greens with good success. From your photo it looks like the is a snake like "soot trail" up the side of the delay grain insulator as if the fire managed to travel up the side. Weird?

Thanks for posting.

Click to expand...

I see that too, but the delay o-ring should seal anything below it, that is what it is there for.