My second build.

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CATO
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Re: My second build.

Postby CATO » Tue Apr 05, 2016 8:53 pm

SpaceManMat wrote:That's a pretty nice look rocket, think you've done pretty darn good.


Awesome.... Looks great....
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AMRS 21 L3

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

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OverTheTop
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Re: My second build.

Postby OverTheTop » Wed Apr 06, 2016 7:34 am

Congrats on a nice build again. You have now entered the world of building with composites (paper and balsa) :!:

A lot of people don't think about composites other than the mainstream fiberglass and carbon fiber. There are many other choices that can be used along the way, especially in low and mid-power.
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ogivemeahome
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Re: My second build.

Postby ogivemeahome » Mon Apr 11, 2016 6:14 pm

Digit wrote:... had them all aligned whilst gluing them ...

If you're using PVA, it tends to shrink as it dries. All it takes is slightly more adhesive on one fillet or different drying rates. Epoxy is your best bet here as there is minimal (if any) shrinkage.

I used superglue to coat some fins a while ago (being careful to apply to the same side on each one). The fins "curled" slightly ( - cambered fins!) - it should give the rocket some spin (have to launch it one day :? ).

Nice paint scheme! :)
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Digit
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Re: My second build.

Postby Digit » Mon Apr 11, 2016 8:19 pm

Thanks for the advice ogivemeahome. I will try some thin epoxy next time I laminate fins.

Well I'm pleased to announce Stage Fright had two successful flights! flying almost vertically and staging beautifully on Estes D12-0 & D12-5's.

The booster tumbled well and landed about 20' from the pad undamaged each time. Ejection was right at apogee and my 18" chute carried the sustainer about a kilometer away in the 'breeze', so for the second flight I cut a 2.5" spill hole in the chute and I'd hazard a guess it went close to a kilometer and a half this time, then about another 500 meters along the ground with me literally running after it :lol: (Thank you very much Nic for spotting me and giving me a ride back on the rocket bike 8) )

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Lister
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Re: My second build.

Postby Lister » Mon Apr 11, 2016 10:34 pm

Well done on your two stage, glad you had some good flights.. did you use the 12" chute at all?

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Digit
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Re: My second build.

Postby Digit » Tue Apr 12, 2016 3:06 pm

No, only took the one rocket.
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cryoscum
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Re: My second build.

Postby cryoscum » Tue Apr 12, 2016 8:56 pm

Good job, mate! Keep it going towards bigger and better things :)
AMRS L3 | NAR L3 | QRS 089 | MDRA 224
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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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jase
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Re: My second build.

Postby jase » Tue Apr 12, 2016 9:12 pm

You're off to a fantastic start with a great bunch of guys there!

If it is a tad windy, and you're worried about 'the long walk' ditch the chutes and attach a streamer.

Old mate has a good selection to choose from http://ausrocketry.com.au/recovery/streamers.html
Me and my rockets run on Moonshine.

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Re: My second build.

Postby camacd » Tue Apr 12, 2016 10:09 pm

Thats pretty fine craftsmanship there digit. Where did you get the fin jig?

I've gone for fibreglass fins instead of balsa. a 1mm thick sheet is fine for smaller rockets like yours. It cuts with tin snips and is very forgiving.

As the rockets get more powerful and faster, the fins need to get thicker to prevent flutter, but I have run 1mm fins on an E motor. I threw a fin on the first flight, then I beefed up the fillets and that rocket has flown about 10 times since then and is holding together really well.

Cam
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Digit
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Re: My second build.

Postby Digit » Tue Apr 12, 2016 10:23 pm

Thanks lads. Cam the jigs and tube marking guides are from Qualman Rocketry http://www.qualmanrocketry.com this is first build I've used them on and so far so good.
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