Full Scale Patriot PAC-1 Missile

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CATO
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Re: Full Scale Patriot PAC-1 Missile

Postby CATO » Mon May 15, 2017 3:37 pm

OverTheTop wrote:
I might have to enlist Krusty's assistance with High Volume Gaseous Ejection (just made that up) as per the V2...


The airbags worked really well (ok, they went off anyway!). The chutes were actually already deployed when the bags went off. We had velcroed the top of the chutes to the other airframe bulkhead and the separation velocity (caused by Troy's 20bar and 30bar deployment pistons) did the rest. Airbags were a "plan B".

Thanks for sharing.. Velcro to the base of the upper components 8) , what a good idea!
OverTheTop wrote:
Sounds like you need "man rated" chutes too :)

I have them already "C9 - 28 Foot" http://aeroconsystems.com/cart/all-parachutes/21-ft-to-28-ft-man-rated-parachutes/, but thanks for the heads up.
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 00,000 Ns (00.00% A)
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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Re: Full Scale Patriot PAC-1 Missile

Postby SpaceManMat » Mon May 15, 2017 5:59 pm

OverTheTop wrote:
I might have to enlist Krusty's assistance with High Volume Gaseous Ejection (just made that up) as per the V2...


The airbags worked really well (ok, they went off anyway!). The chutes were actually already deployed when the bags went off. We had velcroed the top of the chutes to the other airframe bulkhead and the separation velocity (caused by Troy's 20bar and 30bar deployment pistons) did the rest. Airbags were a "plan B".

Sounds like you need "man rated" chutes too :)


Pretty sure those Pistons gave you an extra 50 feet on the nose cone.
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: Full Scale Patriot PAC-1 Missile

Postby OverTheTop » Mon May 15, 2017 6:15 pm

Pretty sure those Pistons gave you an extra 50 feet on the nose cone.

Yep. Sure did. With an apogee of 624' we needed all the help we could get :)
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Re: Full Scale Patriot PAC-1 Missile

Postby TRFfan2 » Tue May 16, 2017 12:00 am

Nice!

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Re: Full Scale Patriot PAC-1 Missile

Postby CATO » Sat May 20, 2017 3:58 pm

Vacuum pump set up has been completed... :D

VP_1_sm.jpg
VP_1_sm.jpg (99.53 KiB) Viewed 323 times

VP_2_sm.JPG
VP_2_sm.JPG (102.92 KiB) Viewed 323 times
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 00,000 Ns (00.00% A)
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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Re: Full Scale Patriot PAC-1 Missile

Postby CATO » Mon Jun 19, 2017 10:32 pm

Fin layup has been completed as per the cryoacum method https://forum.ausrocketry.com//viewtopic.php?f=10&t=4392&start=76, weights are between 620g ~ 630g, thickness is 11.8mm, they need to finished off *they are rough at present) then baked, completed images to follow.

Fin_11.jpg
Fin_11.jpg (105.78 KiB) Viewed 159 times

Fin_12.jpg
Fin_12.jpg (121.48 KiB) Viewed 159 times

Fin_10.jpg
Fin_10.jpg (106.43 KiB) Viewed 159 times
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 00,000 Ns (00.00% A)
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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Re: Full Scale Patriot PAC-1 Missile

Postby SpaceManMat » Tue Jun 20, 2017 8:22 am

Looks very nice, starting to come together now.
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: Full Scale Patriot PAC-1 Missile

Postby Viking » Tue Jun 20, 2017 2:34 pm

Lookin' good!
Hard to get a sense of scale on those fins, they must be huge?
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Re: Full Scale Patriot PAC-1 Missile

Postby drew » Tue Jun 20, 2017 5:07 pm

Viking wrote:Lookin' good!
Hard to get a sense of scale on those fins, they must be huge?


I'd go as far as to describe them as YYYYYUUUUUUUGGGGGGGGEEEEEEEE.

Excellent work CATO.
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Re: Full Scale Patriot PAC-1 Missile

Postby SpaceManMat » Tue Jun 20, 2017 7:45 pm

drew wrote:
Viking wrote:Lookin' good!
Hard to get a sense of scale on those fins, they must be huge?


I'd go as far as to describe them as YYYYYUUUUUUUGGGGGGGGEEEEEEEE.

Excellent work CATO.


No beer bottle, how can we possibly tell?
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: Full Scale Patriot PAC-1 Missile

Postby OverTheTop » Tue Jun 20, 2017 7:46 pm

Keg for scale? :D
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Re: Full Scale Patriot PAC-1 Missile

Postby Digit » Tue Jun 20, 2017 7:48 pm

It's very unlike you Dave not to have a rum and coke in there for scale :lol:
QRS:169
AMRS:108 (L1)

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Re: Full Scale Patriot PAC-1 Missile

Postby CATO » Tue Jun 20, 2017 9:42 pm

Hi guys, thanks for your comments, they are not really that "yuge" (root 480mm, tip 180mm, base 260 + 31mm tab) as I'm trying to keep it true to scale. The surface area per side of an installed fin = 0.086 sqm (8 x 0.086 = 0.688sqm). I was going to use larger fins, but once I ran the sims the achievable alt didn't change much, just need a little nose weight :wink:

Fin_13sm.jpg
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Patriot_PAC1_Specs.jpg
Patriot_PAC1_Specs.jpg (76.63 KiB) Viewed 117 times
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 00,000 Ns (00.00% A)
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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Re: Full Scale Patriot PAC-1 Missile

Postby Viking » Wed Jun 21, 2017 3:21 pm

CATO wrote:... The first (internal) layer of FG has been laid down for the NC, this comprised of 24 gores of 295 gsm FG with a 4/5 overlap (inspiration once again coming from Cryosum and his Sledge Hammer build http://forum.ausrocketry.com/viewtopic.php?f=10&t=3163&start=48) providing @ 2mm think internal layer.

Nose_Cone_Layer.jpg


Dave, apologies for taking you back briefly but I'm trying to understand how the above layering works so I can do the same.
Did you lay all the glass gores down dry (held by tape or something) and then wet it all out together, or was each gore done individually, ie: lay gore, wet it out, rotate a bit, lay the next, and so on working your way around?
It's getting those last gores under the first if it's done the latter way (working around) that's got me confused, if you know what I mean?

I'm also a bit worried about the lot peeling off the plug under it's own weight as I'm rotating the work, did you see any tendency for this to happen or is there enough "stickyness" (for lack of a better word) in the epoxy to hold it all together against gravity?
Simon
WARS #24 / AMRS #54 L1

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Re: Full Scale Patriot PAC-1 Missile

Postby CATO » Wed Jun 21, 2017 10:02 pm

Viking wrote:Did you lay all the glass gores down dry (held by tape or something) and then wet it all out together, or was each gore done individually


Each gore was done individually, the core was made from foam, I marked the foam in 24 equal sections (numbered 1 ~ 24), each gore will cover 5 sections.
Gore #1 - This gore covered sections 1 ~ 5, I applied epoxy only to section 5, then applied the F/C, I then used drawing pins to secure the FG in section 1 only.
Gore #2 - This gore covered sections 2 ~ 6, I applied epoxy to section 5 & 6 then applied the F/C, I then used drawing pins to secure the FG in section 2 only.
Gore #3 - This gore covered sections 3 ~ 7, I applied epoxy to section 5, 6 & 7 then applied the F/C, I then used drawing pins to secure the FG in section 3 only.
Gore #4 - This gore covered sections 4 ~ 8, I applied epoxy to section 5, 6, 7 & 8 then applied the F/C, I then used drawing pins to secure the FG in section 4 only.
Gore #5 - This gore covered sections 5 ~ 9, I applied epoxy to section 5, 6, 7, 8 & 9 then applied the F/C.

Gores #6 to #20 follow a similar pattern as gore # 5

Doing the above means that there is no epoxy thus far in sections 1 ~ 4. When you get to the last four gores, they will go under the existing gores just by removing the drawing pins as required.

Gore #21 - This gore covered sections 21, 22, 23, 24 & 1, remove drawing pins from section 1, apply epoxy to sections 21, 22, 23, 24 & 1, then applied the F/C
Gore #22 - This gore covered sections 22, 23, 24, 1 & 2, remove drawing pins from section 2, apply epoxy to sections 22, 23, 24, 1 & 2, then applied the F/C
Gore #23 - This gore covered sections 23, 24, 1, 2 & 3, remove drawing pins from section 3, apply epoxy to sections 23, 24, 1, 2 & 3, then applied the F/C
Gore #24 - This gore covered sections 24, 1, 2, 3 & 4, remove drawing pins from section 4, apply epoxy to sections 24, 1, 2, 3 & 4, then applied the F/C


The stickyness of the epoxy will hold the FG (the ones with epoxy applied to all five sections) to the core (well it didn't on the Full Scale Patriot), but the FG without the epoxy (or partial epoxy) needs to be secured else they will pull the epoxied layers of the core.

Hope this helps. good luck...
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 00,000 Ns (00.00% A)
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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