My first build.

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jase
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Re: My first build.

Postby jase » Thu Mar 10, 2016 3:18 pm

Hey, nice result 8)

Re: the itch - go to your local medical supplies store and pick up a box of gloves, tongue depressors, syringes, disposable surgical gowns and forearm protectors...

...thank me later :lol:
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Digit
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Re: My first build.

Postby Digit » Fri Mar 11, 2016 7:21 pm

Well I had a few test runs painting an old toilet roll until I was confident top coating and now my first rocket is finished, ready for Sunday! :mrgreen:

Seeing as it will be the first thing I will be launching into orbit with QRS, I have decided to call her Laika, In memory of the famous dog.

Thanks to all for the assistance with my first build, I am looking forward to my first launch!

Image

Image

Image
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vance2loud
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Re: My first build.

Postby vance2loud » Fri Mar 11, 2016 7:23 pm

Love the paint, what colour and type is it?
Great job on your first rocket, most of mine still don't look that good
TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
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Digit
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Re: My first build.

Postby Digit » Fri Mar 11, 2016 7:49 pm

Thanks Vance,

It is Dulux Duramax Diamond Finish.
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Re: My first build.

Postby Viking » Fri Mar 11, 2016 7:51 pm

That looks great! Nice work.
I have an unused can of that here for another project, can't wait to use it.
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Re: My first build.

Postby kopius » Sat Mar 12, 2016 12:30 am

Looks great, looking forward to seeing it rip skywards in Sunday!!


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Re: My first build.

Postby CATO » Sat Mar 12, 2016 7:18 am

kopius wrote:Looks great, looking forward to seeing it rip skywards in Sunday!!

+1 An awesome first build....
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2017: 5,973 Ns (13.14% M)
Ns 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
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Digit
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Re: My first build.

Postby Digit » Sat Mar 12, 2016 11:16 am

Does this recovery rigging look correct?
Image

Also here is the finished mosquito, open rocket predicts an altitude of 68m :lol: This will give me two alternate recovery methods for the beginners program.
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kopius
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Re: My first build.

Postby kopius » Sat Mar 12, 2016 3:52 pm

Looks fine, however I would ditch that clip in the middle of the swivels. The chance of it bending and coming loose is very high.


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Re: My first build.

Postby Digit » Sun Mar 13, 2016 3:26 pm

A great first launch day with QRS today, got to put some faces to names and see some great rockets.My 'Laika' had 3 successful launches and recoveries, and I let the pocket rocket rip once, giving me 4 launches for the day.

On all three Laika launches I experienced severe weather cocking, to the point where my delay charges were deploying approx. 1/3 of the distance between apogee and spudding in (this ended up destroying my parachute on third launch, but rocket was recovered safely and undamaged using it as a streamer). Can any more experienced folk tell me if this is something I should have been able to see in open rocket and select shorter delay motors? I was pretty confident entering measurements and calculating CP in the program but didn't know too much about the flight simulation data side of things.

As for the little fella, I seem to have manufactured a teleportation device! On 'liftoff' it simply vanished from the launch pad and reappeared 100m away nose down in the soil. I didn't see it go up, I didn't see it come down. :lol:

Image
Laika and myself before her maiden flight on a B6-4.

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Boy was I glad to see this, I was really worried about my first recovery after watching it arc over.

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Ready for the second launch on a C6-5.

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Ready for her third and final launch on a C6-5, just before a torrential downpour. This is the launch that ripped 4 of the 6 shroud lines out of the 'chute.

Image
The mighty mosquito. That tiny yellow dot on the second pad from left on bank A; believe it or not; is a rocket!

Image
Spotted after about 15 minutes of strolling around, I seriously did not expect to find this.
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SpaceManMat
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Re: My first build.

Postby SpaceManMat » Sun Mar 13, 2016 4:53 pm

Nice, 4 flights is a great start 8)

Ok with stability, I didn't read your whole post, did you produce a simulation of the rocket?
If so did you actually weigh the finish rocket with the motor in and check its CG?

If so please share any files you have and we will go from there.
QRS: 124
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Re: My first build.

Postby Lister » Sun Mar 13, 2016 6:59 pm

Well done. Its great fun isn't it :)

In open rocket you can change the motors to ones with longer/shorter delays and open rocket should give you an accurate estimate of time to apogee which you can use to select the right delay for a particular size motor.

as for the parachute I personally don't like plastic parachutes because they have a tendency to fail especially if the delay is a bit off.. you can get cheap ripstop nylon chutes from ausrocketry or you can do what alot of us do and buy the ripstop from spotlight or emmakites.com and make them yourself ;) or I can make a small nuke chute for you :)

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Digit
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Re: My first build.

Postby Digit » Sun Mar 13, 2016 7:59 pm

open rocket file.
mfr.zip
(52.75 KiB) Downloaded 11 times
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Re: My first build.

Postby SpaceManMat » Sun Mar 13, 2016 8:52 pm

Digit,

Ok here is the stability with a B motor

Image

And C

Image

Off the pad both have big stability issues. I didn't see the flight but the first thing I would want to know is how well does the model actually match the real thing? Did you measure it and confirm the length, diameter and fins are all the correct sizes. Is the weight correct and is the CG correct? You can find the CG by placing it on your finger and then finding the point at which it changes from tipping one way to tipping the other. I also saw slow liftoff speeds so the simulation is definitely on the heavy side.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

vance2loud
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Re: My first build.

Postby vance2loud » Sun Mar 13, 2016 9:08 pm

Looking at your sim it appears that there is excess weight in the fins.
When I built aircraft years ago with dope I use to mix it into a paste with some baby powder if I was using it as a sealer, it helps it to fill voids and reduces the amount needed (It also sanded easier).
If the weights in your sim are correct I would guess that the balsa soaked up a lot of dope when you were sealing it.
As everyone else has said check your CoG against what the sim says and we can work from there.
Also looking at the stability graphs that SpaceManMat posted it might help if you can find a longer rod to allow for a higher speed as you leave the pad.
TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
- Thomas Alva Edison


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