German donteibution to Thunda 2015, Project SunSeeker

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mgaertne
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German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Thu Jan 01, 2015 1:15 am

Happy new year to all and may the time fly until march!
I'd like to introduce my little project for the Thunda Down Under event.
It is called SunSeeker.
General data:
4" minimal diameter all carbon airframe
CTI Pro98 6xl motor
Weight on pad: about 30 kg
Altitude: around 8500 m
Speed: 670 m/s
Accel.: 198 m/s2
The parts are shown here:
einzelteile.jpg
einzelteile.jpg (72.61 KiB) Viewed 2079 times

The fin can is an all aluminium fin can just to be sure that I do not have a missing fin during flight...
The rocksim picture is
sunseeker1.png
sunseeker1.png (4.83 KiB) Viewed 2079 times

What's not in the pictures are some bulkheads and allthreads. Also, the electronics sleds are missing here...
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Thu Jan 01, 2015 1:22 am

The building process is quite easy. A center ring with two 6mm holes is epoxied into the payload tube, that's the largest one in the picture.
This ring is the upper mounting point for the individual rocket parts.
The motor retention (the red cylinder with the eyelet) is glued into one of the two smaller tubes. Also with two 6mm holes.
In order to glue the retainer in, I driled a hole in the tube just above the position where the retainer will be seated. This hole is used to pour epoxy on the retainer surface while turning and pushing it into place. This ensures that the whole retainer surface is used as glueing space...
The lower part of the rocket consisting out of the fin can and the other of the shorter tubes slides over the motor. The motor retention tube is screwed onto the motor, holding these three parts together.
Two M5 allthreads are running from the retention up to the payload tibe and fixes this one onto the motor. This leaves the nose cone as the single detachable part. Thats were the parachutes will be deployed.
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Thu Jan 01, 2015 1:31 am

The electronics will be two separate computers. One, the telemega, is sitting in the nose cone because this part in fiber glass and not carbon. Helps with the telemetry signal.
This computer fires the apogee event. As ejection charge a peregrine CO2 System is used.
The second computer, an Altimax G2, is situated in the coupler tube between the payload tube and the motor retention tube.
This one fires a backup Peregrine system and controls the deployment of the main chute.
The main chute is controled by a tether system. When is is released the drogue will pull out two deployment bags with parachutes in it before separating the nose cone from the body.
The rocket should then land in two parts.
Yes, the main event is not controlled with redundancy, but I recon if that fails, the rocket wil land a bit harder then expected but should still survive (being carbon and alu).
Since the distance between the coupler and the upper payload ring is quite large and would create a too big payload section, a pml pertinax coupler is used as an e-bay extension. This coupler is filled with a pressure tube (25mm body tube wrapped in 4 layers of 200g/m2 fiber glass), two alu tubes for guiding the allthread and one tube for guiding the tether ignitor wires down to the Altimax.
verlaengerung1.jpg
verlaengerung1.jpg (76.74 KiB) Viewed 2077 times

The pml coupler will also accomodate about 2 Kg of lead to reach the perfect calculated mass.
Some more pictures to follow...
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby Lamp » Thu Jan 01, 2015 8:38 am

G'day and welcome to the forum.
This looks like a very cool project and I will look forward to watching it fly! :D
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby SpaceManMat » Thu Jan 01, 2015 9:41 am

welcome to the forums Mathias

An interesting rocket your building. I take it you built the fin can?
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby vk2icj » Thu Jan 01, 2015 1:18 pm

looking forward to this build
73 de vk2icj ..

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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby cryoscum » Thu Jan 01, 2015 4:52 pm

Looking like a cool project, Matthias! I'm also doing a minimum diameter O3400 at Thunda (along with 2 other flights), so it will be good to catch up there.
Is the fincan one of those Frank de Brouwer was selling some years ago?

Cheers
Nic
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Total impulse for 2015: 84,231 Ns
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Fri Jan 02, 2015 8:33 pm

Just saw my title, seems that preheating for new year was a bit too much already. two major typos in one word...

Anyway. as it has been asked. The fin can is indeed from Frank de Brewer. My whole workbench is about the size of the desk with the australian map behind it. So making anything out of metal is more or less out of the question. I'd rather outsource that :-)

The airframe is based on a moongoose kit but that's about it.
Right ow I have to finalize some computer forensic works (court starts again on the 9th) so my next progress will be a bit delayed.
But there's not too much to be done:
1. Add the appropriate weight to the PML coupler and glue the coupler shut.
2. Build the recovery harness (tubular nylon, rated 15KN)
3. Build the electronic sledges
4. Make a recovery test (8 g or 12 g CO2)
5. finanlize the checklist (currently 21 pages including motor assembly)

Cheers

Mathias
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Wed Jan 07, 2015 9:19 pm

While the Epoxy for the last 250g of lead is curing I attach my bulk-head design here.
Bulkhead.png
Bulkhead.png (46.62 KiB) Viewed 1982 times

Yes, I know, as an engineer I should have done that in mm instead of civil engineering cm. But I just couldn't figure out (or was too lazy to look) how to change that measurement in LibreOffice.
The goal is to attach the peregrine CO2-system inside the E-Bay. The gas will flow though the large hole (18mm). The peregrine system is positioned there with four 3mm screws.
The groove around the peregrine hole is the centering tool to attach the extender tube (the glassed 25 mm tube). This one is needed to extend the gas tube through the PML-coupler with the lead weight. That said, there is a second of these bulkheads on the other side of the PML coupler. A third (without some of the holes) is the nose cone bulkhead.
The other holes are for the M5 allthreads that hold the whole rocket together and one is for the extension of the ignitor wire that will ignite the tether system.

So, I'm nearly finished. The remaining tasks are the e-bay sledges for the two computers (Altimax G2 and Telemega), the first one will get a generous 1600mAH 2S LiPo, good for about 1 week of operation and the latter will have the original battery plus a good pyro battery. This one should run a day or so.

BTW: Does somebody bring a good antenna (mast mounted) for the telemega? If not I must buy one...
I will have a hand held 5 element yagi for the secondary tracking but I feel safer to have a fixed antenna with a good gain as well.

Mathias
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby OverTheTop » Fri Jan 09, 2015 1:00 pm

I will be bringing my 434MHz patch antenna:
viewtopic.php?f=32&t=4770

It is only tripod mounted, and you might want to wait till I test it on the range before using :)
FYI the connection it has is SMA-RP like this to interface to:
sku_55723_2.jpg
sku_55723_2.jpg (25.81 KiB) Viewed 1960 times


You are welcome to use it if I am not using it at the time.
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Sat Jan 10, 2015 1:04 am

Hi,
that sounds good (I saw your thread, I'm impressed)...
I think we could find some arrangement since I will do ONE flight only during the whole event...
In case: I do have a TeleBT and an USB-Dongle for the Altus-Line available then...

Cheers

Mathias

OverTheTop wrote:I will be bringing my 434MHz patch antenna:
viewtopic.php?f=32&t=4770

It is only tripod mounted, and you might want to wait till I test it on the range before using :)
FYI the connection it has is SMA-RP like this to interface to:
sku_55723_2.jpg


You are welcome to use it if I am not using it at the time.
Prefect prefecture #123, TRA # 10915, L3, VP of AG-Modellraketen e.V./Germany
Becoming older is mandatory, growing up is optional

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Re: German contribution to Thunda 2015, Project SunSeeker

Postby mgaertne » Sat Jan 10, 2015 1:11 am

Back to topic,
after about three hours of configuring and reconfiguring the recovery system, I found that one of the chutes is slightly too large for my 4" tube. It will come out but with considerable effort, too much for my little drogue. I just ordered a new, smammer chute.
In the mean time I built the first computer sledge. This one will go into the lower e-bay and will house the Altimax G2 with a good 1600mAH LiPo.
It is about 200mm long and 90mm wide.
Computer-Altimax.jpg
Computer-Altimax.jpg (58.92 KiB) Viewed 1941 times

The computer, shown lower left corner, will acutally be mounted on the other side of the sledge. A good screw-type terminal will connect the individual power- and igniter lines with the computer. In the middle of the sledge is the screw-type on/off Switch.
Some cable ties (not done yet) will hold everything in place that is not bolted. The battery is locked in place by the two aluminium U-frames, sideways will have two cable ties.
The other sledge, the one for the telemega will essentially look quite similar.
Mathias
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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby mgaertne » Sun Jan 11, 2015 8:31 pm

And finally,
the whole thing assembled...
Full-Rocket.jpg
Full-Rocket.jpg (78.69 KiB) Viewed 1913 times


Mathias
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Becoming older is mandatory, growing up is optional

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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby SpaceManMat » Sun Jan 11, 2015 8:36 pm

Looks like you mean business. Nice work
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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Re: German donteibution to Thunda 2015, Project SunSeeker

Postby october sky » Sun Jan 11, 2015 9:03 pm

Looking great Mathias ! 8)
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