CTI G150BS failure

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Lister
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CTI G150BS failure

Postby Lister » Tue Apr 26, 2016 12:08 pm

Yesterday I tried to test the dual deployment setup with my replacement RRC3. I left the 13second delay untouched as I was using the RRC3 for deployment and a cable cutter, so the motor ejection charge was just as a backup.

It was very sluggish leaving the pad and about 50ft in the air the payload section separated and flame shot out the top of the airframe and the rocket fell back down. No damage to the rocket besides a blackened airframe, the motor case is fine and the nomex protected the chute. Looking at the motor in the daylight today it looks like its either burnt through the delay and blown a hole in the charge holder as the motor was still burning when it happened or its shot the entire delay grain through the charge holder. But the hole doesnt look large enough for the whole delay grain to fit through, and the hole looks perfectly round like its been drilled. As you can see in the photo there is still alot of propellant left in the case that hasnt burnt, maybe it extinguished itself when it blew through?

So apart from a wasted G150 I havent really lost anything, but im now worried about launching the other G150 that I have as I dont want to have the same thing happen. I have probably launched 6 of the G150's and this is the first failure I have had of a CTI motor so im just wondering if I have been lucky to not have one go before this or if I was just very unlucky? And what should I do with the other G150?
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SpaceManMat
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Re: CTI G150BS failure

Postby SpaceManMat » Tue Apr 26, 2016 12:35 pm

Make sure you file a MESS report. I've not heard of that particualar failure but I dont have 24mm CTI either.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

Lister
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Re: CTI G150BS failure

Postby Lister » Tue Apr 26, 2016 1:36 pm

I have just lodged a MESS report for it. Some of the Yanks are saying they have seen similar things with AT motors and the 38mm & 54mm CTI but its a head scratcher.

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Viking
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Re: CTI G150BS failure

Postby Viking » Tue Apr 26, 2016 1:39 pm

Wow.
Did all your G150's have the same dates on them or is this one an odd-one-out?

I also had a CATO on Sunday. An AT G64W. The forward closure got spat out before it even left the rail.
Will post a vid soon.
Simon
WARS #24 / AMRS #54 L2

Lister
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Re: CTI G150BS failure

Postby Lister » Tue Apr 26, 2016 10:15 pm

Date is Dec 23 2010. I have had a few with that date before and not had ANY problems. the other G150 I have here is also the same date. I think these are the last of the old batch but there could be more?

If I can find some free editing software I will upload the video of it.. had the sjcam sitting next to the pad and it caught it all.. looks pretty cool :evil:


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