Launch Day 11th August

New South Wales Rocketry Association

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Kryten
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Launch Day 11th August

Postby Kryten » Tue Aug 13, 2013 10:44 am

We've had some great weather recently, and today was no exception. Dead calm at first, only developing to light NW winds by late morning.
A warm welcome to our newest members.
38 launches on the full range of motors from 1/2A to H certainly kept the crowd entertained
"Pub, ah yes. A meeting place where people attempt to achieve advanced states of mental incompetence by the repeated consumption of fermented vegetable drinks" (“Timeslides”)

BerowraRocketBoy
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Re: Launch Day 11th August

Postby BerowraRocketBoy » Tue Aug 13, 2013 11:22 am

H for horrible.
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MPR cert: Grey Dot on an F52-8T

Level 1 cert: Ok... so maybe I was a little optimistic putting this in. But if I do do it, then it'll be something fast.

air.command
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Re: Launch Day 11th August

Postby air.command » Tue Aug 13, 2013 12:20 pm

The green rocket had a bit of a wild ride off the pad as well. Reviewing the video it looked like something had partially blocked the nozzle just as it left the guide rail. The flame looked good up to that point, but as it just left the guide rail the flame went sideways and continued to look split in flight. I believe it was an H238 (but would need to check)

- George
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Crop Circles: ... just a bunch of guys looking for their rockets ....

Kryten
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Location: Sydney

Re: Launch Day 11th August

Postby Kryten » Tue Aug 13, 2013 3:09 pm

Yep - that was Spencer's "G-Force" on a H238.
It'd probably be worth his while reporting this to Aerotech, with these supporting pics.
Interestingly, I seem to remember him having a similar phenomenon occur some time ago (different motor)
"Pub, ah yes. A meeting place where people attempt to achieve advanced states of mental incompetence by the repeated consumption of fermented vegetable drinks" (“Timeslides”)

october sky
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Re: Launch Day 11th August

Postby october sky » Wed Aug 14, 2013 2:34 pm

Well, that sure looks different...clearly a split flame and as George suggested maybe partly blocked nozzle....just weird that it happened second or two later on.... :shock:

Otherwise it sounded like a great day...and lot of launches also ! 8)
QRS Inc. NO: 003

Life Member

TRA #11616 L3

vk2icj
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Re: Launch Day 11th August

Postby vk2icj » Wed Aug 14, 2013 4:15 pm

I wasn't there unfortunately as work had to come first :evil:

I have seen flights and after pics in the past of similar flights.

Was the motor case inspected after the flight? Is there any possibility that there was a leak around the aft closure? It really looks like the aft Oring wasn't seated properly or the closure tight enough and allowed another exit route for the gas. The last photo there shows the second stream of vented gas appearing to come from the side of the motor end not the centre

Cheers

Chris
73 de vk2icj ..

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rocket_troy
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Re: Launch Day 11th August

Postby rocket_troy » Wed Aug 14, 2013 4:51 pm

I have seen a similar thing happen in the past with a loose o'ring partially blocking the throat (although not an Aerotech motor).

TP
ERG #02


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