Dual booster for Sunday 15May

Rocketry that will literally wet the appetite

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kitestring
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Dual booster for Sunday 15May

Postby kitestring » Fri May 13, 2016 3:36 pm

Been a while since i did any rocketry, but this is a project I have been wanting to try for a while.
No testing done at all, just lots of hoping and closing my eyes on the day....
Just short of 7ft tall. Not expecting much height but hope to get boosters to drop off around 80ft and main stage to continue onwards.
Main stage has 9mm nozzle and will be pressurised to around 90psi only. Boosters will be hand pumped (any volunteers?) to around 60psi and have 20mm nozzles. Have tested a smaller version of this in the local park with some success. There are no metal components, just plastic and bamboo skewers with some reinforcing glass wraps. Payload includes camera, and launchpad altimeter for chute deployment.
Weather forecast is wonderful and looking forward to watching lots of great launches.
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air.command
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Re: Dual booster for Sunday 15May

Postby air.command » Fri May 13, 2016 3:58 pm

Looks really awesome Jeremy! Is the rocket held down only by the main stage, and the boosters are free to move off their nozzle seats? Best of luck with the flight, it's always rewarding when everything works especially with these more complex rockets. I'm looking forward to the flight report :D

- George
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kitestring
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Re: Dual booster for Sunday 15May

Postby kitestring » Fri May 13, 2016 4:06 pm

air.command wrote:Looks really awesome Jeremy! Is the rocket held down only by the main stage, and the boosters are free to move off their nozzle seats? Best of luck with the flight, it's always rewarding when everything works especially with these more complex rockets. I'm looking forward to the flight report :D

- George

Gday George, yep just held down by main stage. Bit nervous as has been a long build but I have to try it sometime.

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cryoscum
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Re: Dual booster for Sunday 15May

Postby cryoscum » Fri May 13, 2016 6:36 pm

Looking really nifty, please post pics of the flight! :D
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Total impulse for 2016: 32,458 Ns (thus far)
Total impulse for 2015: 84,231 Ns
Total impulse for 2014: 40,757 Ns
Total impulse for 2013: 62,927 Ns

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Re: Dual booster for Sunday 15May

Postby CATO » Fri May 13, 2016 7:05 pm

Hi Jeremy,

Nice, good luck with the flight...
"In thrust we trust"

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Impulse:
2017: 5,973 Ns (13.14% M)
Ns 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: 1.14M

kitestring
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Re: Dual booster for Sunday 15May

Postby kitestring » Sat May 14, 2016 6:13 am

Thanks all, will post results, vid and pics

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Re: Dual booster for Sunday 15May

Postby kitestring » Mon May 16, 2016 12:42 pm

Had two attempts to fly the rocket on a perfect weather day. Unfortunately had a couple of issues. a leaking seal, then a leak on the launch pad and a faulty deployment sytem. There's a lot that can go wrong with this set up, so I'm not surprised. Anyway, its back on the bench for some tweaking and hopefully a launch in the next couple of months. Thanks to Jeff for the assistance. It's impossible to launch this alone.

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kopius
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Re: Dual booster for Sunday 15May

Postby kopius » Mon May 16, 2016 1:20 pm

For what its worth, it looked impressive sitting on the pad. All the best in fine tuning it and I look forward to seeing it fly soon :-)
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cryoscum
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Re: Dual booster for Sunday 15May

Postby cryoscum » Mon May 16, 2016 6:56 pm

Hi Jeremy

These things do happen unfortunately... You'll get it right and I'm sure it'll do the trick very nicely.
I had one of those moments at Red Glare in 2013. A rocket I had left with Mike P was to be flown on a 75mm motor and I got him to install 2 ravens for me as we were short on time (I had taken my own ravens back with me to Aus several months earlier). He installed them and I prepped the night before in my Holiday Inn room not far from the launch site. I thought I had better check the setup first and just put some e-matches on the outputs, not having anything else to test with, and powered up the AV-bay. The one raven promptly fired its e-matches on the damn carpet! Smoke all over and the damn windows are fixed! No real damage though, but it would have been bad if the sprinklers had triggered! Turns out the one raven was Blake's, a unit that had spent months in a swamp in Wisconsin before it was found and Mike promptly installed it for me! With buddies like that!?!

Flew the rocket the next day with the good raven and all went well. Clearly Mike's not getting any booze from us at WWW in June!

It's not that you had a failure, because we all have them, but how you get through it gracefully without skipping a beat :)

Cheers
N
AMRS L3 | NAR L3 | QRS 089 | MDRA 224
AMRS Technical Advisory Group

Total impulse for 2016: 32,458 Ns (thus far)
Total impulse for 2015: 84,231 Ns
Total impulse for 2014: 40,757 Ns
Total impulse for 2013: 62,927 Ns

air.command
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Re: Dual booster for Sunday 15May

Postby air.command » Mon May 16, 2016 9:25 pm

Sorry to hear the flight attempt didn't quite go according to plan, but it sounds like you've identified what needs to be fixed for the next attempt. If it all worked the first time rocketry wouldn't be so much fun. ... just ask Elon. Best of luck for the next launch.
Crop Circles: ... just a bunch of guys looking for their rockets ....

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Re: Dual booster for Sunday 15May

Postby Scoop1261 » Mon May 16, 2016 10:04 pm

cryoscum wrote:
It's not that you had a failure, because we all have them, but how you get through it gracefully without skipping a beat :)



As Neil McGilvray would say ........ "Everybody gets to have a turn in the Barrel!"
Why Limit Yourself?

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Impulse: A Whole Lot ..So much I've lost count!

kitestring
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Re: Dual booster for Sunday 15May

Postby kitestring » Tue May 17, 2016 9:31 am

Thanks all, very funny story on the ravens..
Enjoyed the day out regardless. Catch u all next time round


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