Something small and fast

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drew
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Something small and fast

Postby drew » Sun Mar 18, 2018 10:43 am

The AMRS I impulse motor altitude record is still on the table so to speak. At WWW2018 I plan on having a crack at remedying that. I'm currently building a 29mm minimum diameter rocket for this purpose. It's a pretty standard MD build for me. Airframe and fins are carbon fibre and made by me. The Nose Cone is commercially sourced, a Performance Rocketry 29mm VK fiberglass NC. Design is single break, dual deploy with a cable cutter used for chute deployment. I'm still not certain on the size of the chute I'll use but it'll be somewhere between 9-15" (Top Flight thin mill chute). Deployment and tracking will be handled by a TeleMini v3.0 housed in the nose cone.

The fin design is purposefully conservative. I want to ensure stability in flight and leave some space if someone else wants to come along and best me. Even with that though the vehicle will do alright, I expect to reach at least 10k' on a CTI I243. Below is a rough sim I'm put together. Should be fun!

Image
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

drew
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Re: Something small and fast

Postby drew » Sun Mar 18, 2018 6:26 pm

Here's where I'm at so far.

Image
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

drew
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Re: Something small and fast

Postby drew » Sun Mar 18, 2018 11:50 pm

Image

Image

That's better. Sorry for the stuff up with the images earlier.
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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SpaceManMat
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Re: Something small and fast

Postby SpaceManMat » Mon Mar 19, 2018 12:19 am

Looks pretty good. All the best with your record flight, need more of these types of flights I belevie.

I’m particularly interested in how you do your cable cutter. I’m yet to DD with a single break.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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kopius
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Re: Something small and fast

Postby kopius » Mon Mar 19, 2018 6:55 am

Nice Drew... there is talk of a similar rocket in QLD, so it would be awesome for you to smash out a super high flight to give the east coast something to aim for ;-)


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drew
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Re: Something small and fast

Postby drew » Mon Mar 19, 2018 11:42 am

SpaceManMat wrote:Looks pretty good. All the best with your record flight, need more of these types of flights I belevie.

I’m particularly interested in how you do your cable cutter. I’m yet to DD with a single break.


Cheers bud, much appreciated. I also think we should have more record attempt flights in the AMRS, I reckon the Records Committee needs something to do!

With regards to the cable cutter, here's what I'm using.

http://aeroconsystems.com/cart/launch-recovery/cable-cutter-by-archetype-rocketry/

I've been using them for years now, from 38mm to 75mm MD flights (including my M2250 flight at THUNDA in 2015). I've yet to use one on a 29mm flight but it obviously fits fine. I reckon I'll most likely use a 15" chute with it.
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

drew
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Re: Something small and fast

Postby drew » Mon Mar 19, 2018 11:44 am

kopius wrote:Nice Drew... there is talk of a similar rocket in QLD, so it would be awesome for you to smash out a super high flight to give the east coast something to aim for ;-)


Great news! I hope this kicks off a bit of a competition!
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

drew
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Posts: 808
Joined: Sat Aug 01, 2009 10:20 pm
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Re: Something small and fast

Postby drew » Mon Mar 19, 2018 1:51 pm

kopius wrote:Nice Drew... there is talk of a similar rocket in QLD, so it would be awesome for you to smash out a super high flight to give the east coast something to aim for ;-)


Giving this a little more thought why don't y'all bring that bird along for WWW2018!?!?! I doubt we'd be able to drag (we only have one tower launcher currently) but assuming both are successful we could have an QLD vs the West shoot out for the I Impulse motor altitude record! Just a thought...
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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SpaceManMat
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Re: Something small and fast

Postby SpaceManMat » Mon Mar 19, 2018 5:17 pm

Yeah looked at them before but have heard reports of issues keeping the chute wrapped. Would be nice is Blake stoked them :wink:

Just found out westmar is in April, might get some competition sooner than you think. The I’ve got a little bird that’s been waiting for over a year to fly, work and weather has not been cooperative...

drew wrote:
SpaceManMat wrote:Looks pretty good. All the best with your record flight, need more of these types of flights I belevie.

I’m particularly interested in how you do your cable cutter. I’m yet to DD with a single break.


Cheers bud, much appreciated. I also think we should have more record attempt flights in the AMRS, I reckon the Records Committee needs something to do!

With regards to the cable cutter, here's what I'm using.

http://aeroconsystems.com/cart/launch-recovery/cable-cutter-by-archetype-rocketry/

I've been using them for years now, from 38mm to 75mm MD flights (including my M2250 flight at THUNDA in 2015). I've yet to use one on a 29mm flight but it obviously fits fine. I reckon I'll most likely use a 15" chute with it.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

drew
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Posts: 808
Joined: Sat Aug 01, 2009 10:20 pm
Location: Perth

Re: Something small and fast

Postby drew » Mon Mar 19, 2018 5:45 pm

SpaceManMat wrote:Yeah looked at them before but have heard reports of issues keeping the chute wrapped. Would be nice is Blake stoked them :wink:

I'd prefer if he made his own. From my understanding the product I use appeared on the market within weeks of Charles Ogino (Carolina Composite Rocketry) answering a large amount of questions regarding his cable cutter setup from the producer/vendor of archetype. As for issues with the chute staying wrapped, That's user error imo. I've used them in heaps of flights from 38mm to 75mm MD birds. I've only had one not cut the zip tie but that was due to an error on my behalf.

SpaceManMat wrote:Just found out westmar is in April, might get some competition sooner than you think. The I’ve got a little bird that’s been waiting for over a year to fly, work and weather has not been cooperative...


Fingers crossed you get your bird in the air! What are your sims looking like? :D
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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Viking
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Re: Something small and fast

Postby Viking » Tue Mar 20, 2018 2:01 pm

Sounds good, still can't see the photo's though. (Home/Work/Mobile)
Looking forward to watching this one rip!
Simon
WARS #24 / AMRS #54 L1

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OverTheTop
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Re: Something small and fast

Postby OverTheTop » Tue Mar 20, 2018 2:18 pm

I can't see any images either. There was a simulation drawing I think earlier on, but now it is not displayed.
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drew
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Re: Something small and fast

Postby drew » Tue Mar 20, 2018 3:28 pm

Strange. TBH I'm not sure if the fault lies with the forum or Google. Here's a couple links to the photos on Google, hopefully they won't have any issues.

https://photos.app.goo.gl/pvTMdlnBd93BFJ1F3

https://photos.app.goo.gl/EtTjm2UDnqkrPOIA3
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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OverTheTop
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Re: Something small and fast

Postby OverTheTop » Tue Mar 20, 2018 3:42 pm

Links work :wink:
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Viking
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Re: Something small and fast

Postby Viking » Tue Mar 20, 2018 4:53 pm

drew wrote:Strange. TBH I'm not sure if the fault lies with the forum or Google. ....

Ah, yeah it's Google. I tried embedding Google photo's a while back(edit: for WWW2017) and it drove me nuts, I gave up and opened an Imgur account, easy peesy.
I learned soon after that you need to use an embed code generator for Google Photo's. I never tried it (because... Imgur) but here's the link:
https://ctrlq.org/google/photos/?_ga=2. ... 1521528446
Simon
WARS #24 / AMRS #54 L1


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