David "CATO" Bell - TRA Cert 1 launch.

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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby krusty » Sat Oct 27, 2012 4:00 pm

Stewart wrote:I put the forward and aft O'rings in ass about.

Yeah, that'll do it :(

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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby CATO » Sat Oct 27, 2012 4:06 pm

IMG-20121027-00096.gif
IMG-20121027-00096.gif (132.28 KiB) Viewed 2319 times

IMG-20121027-00092.gif
IMG-20121027-00092.gif (137.05 KiB) Viewed 2319 times


Must have been my own stupid fault... I did check the o'rings but can't be 100% sure. Live and learn, just happy it didn't occur with my L1 cert flight...
"In thrust we trust"

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2020: 00,000 Ns (0% Z)
Ns 19: 14,725; 18: 14,767; 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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David "CATO" Bell - TRA Cert 1 launch.

Postby Lamp » Sat Oct 27, 2012 7:45 pm

If you go to the Aerotech website you can download an "o" ring guide that you can print out, I always have one with me at a launch. You sometimes get them in with the reloads too... ;-)
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby CATO » Sat Oct 27, 2012 7:58 pm

Cheers, sounds like a great idea. Lesson learnt, will never let this happen again.
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2020: 00,000 Ns (0% Z)
Ns 19: 14,725; 18: 14,767; 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby OverTheTop » Sat Oct 27, 2012 9:37 pm

I can see how people would get the sizes mixed up as they are quoted in quaint imperial measurements (inches) and in fractions thereof just to add to the confusion. I guess I was lucky enough to go through the metric changeover at the right age to know both systems well.

Man, am I glad we do physics in metric :!:
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Re: David

Postby Kryten » Sun Oct 28, 2012 6:38 am

Lamp wrote:If you go to the Aerotech website you can download an "o" ring guide that you can print out, I always have one with me at a launch. You sometimes get them in with the reloads too... ;-)

Sounds like a plan. We could have one of these in the Site folder.
There have obviously been a number of incidents related to this, so having a reference sheet may help prevent this sort of occurrence

My sympathies, David :cry:
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby ROCKet STAR » Sun Oct 28, 2012 7:39 am

Damn, that's unlucky David. We all either crash or toast rockets at some point in this hobby, best to just look at it as alearning opportunity. :(
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby Lamp » Sun Oct 28, 2012 7:56 am

Here is a link to the High Power "O" ring guide:
http://www.aerotech-rocketry.com/uploads/a2b872e4-4ee1-45d6-8046-c43695b64781_hp_rms_o-ring_spacer_guide.pdf

Here is a link to the Medium Power "O" ring guide:
http://www.aerotech-rocketry.com/uploads/98964ee6-9889-4fe7-9c8b-3d3fe41e766f_mr_rms_o-ring_spacer_guide.pdf

If you print these out as 100% they will be true to scale.

Not all motors contain all the O-Rings, but the parts list in the instructions will tell you which ones you should have. You can lay them out on the guide to make sure which O-Ring goes where. I have put a fair number of reloads together and I know what should go where, but I still use a guide.... :wink:
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby CATO » Sun Oct 28, 2012 8:08 am

Cheers "Lamp"...
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2020: 00,000 Ns (0% Z)
Ns 19: 14,725; 18: 14,767; 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: David

Postby krusty » Sun Oct 28, 2012 8:28 am

Lamp wrote:If you go to the Aerotech website you can download an "o" ring guide that you can print out, I always have one with me at a launch. You sometimes get them in with the reloads too... ;-)

Im with Pete on this! I printed these a while back and laminated them :) Saves them from getting covered in grease and gunk. And they do help :)

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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby vk2icj » Sun Oct 28, 2012 9:07 am

Great post with the links to the O ring charts Lamp. I haven't been in Sydney for a couple of weeks able to come out and fly with you guys but I hope to soon. Looks like I've missed some good flights out at doonside.

Chris
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby str8up » Sun Oct 28, 2012 9:24 am

Commiserations mate - as a new comer to RMS I have to thank you for posting your bad luck - it has made me aware to be Sooo careful when reloading motors. I have printed out an "O" ring guide to keep in my range box.

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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby air.command » Sun Oct 28, 2012 10:53 am

It was sad to see all the carnage the motor caused to your rocket David. Hopefully the front end of the rocket can be re-used in a rebuild.
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby kopius » Sun Oct 28, 2012 11:33 am

David and I spoke about this on the phone for a bit yesterday and it is always a shame to see someones rocket come down in a flaming heap. As I always tell people at QRS launches, if something is not assembled correctly, the flyer will end up disappointed, however for the spectators, it generally will be VERY KEWL and look SPECTACULAR!!

Now, for the people who joined the forum in the last couple of years may not have seen the following thread, however I find it interesting that some people commenting here, commented on it way back in 2009 when young (at the time) Alex assembled his O-Rings back to front. This looked unreal, however was a costly exercise indeed. Only days after, Aerotech published a new version of the O-ring chart which is certainly an invaluable tool in every rocketry toolbox.

http://ausrocketry.com/forum/viewtopic.php?f=8&t=1909&p=24893&hilit=ring+spacer+guide#p24893

A quick rule of thumb, If you have different size O-Rings, the one that fits snuggly on the nozzle is generally the one that goes there! Further to this, if a part is missing, DO NOT CONTINUE!! All parts are required if it says so.
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Re: David "CATO" Bell - TRA Cert 1 launch.

Postby cryoscum » Sun Oct 28, 2012 11:38 am

All good with the o-ring chart etc, but you could also just use a CTI motor! No o-rings, no cleaning up afterwards, no bullshit, just burning pleasure!
I've heard a rumour there is a massive CTI shipment on it's way, as we speak...
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