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by air.command
Tue Mar 24, 2020 2:18 pm
Forum: Scratch Built
Topic: Model Rocket Survey
Replies: 5
Views: 210

Re: Model Rocket Survey

Also filled in the Survey. Good luck with the research project.
by air.command
Tue Mar 10, 2020 10:13 pm
Forum: Air Command Water Rockets
Topic: Practical Engineering Collaboration
Replies: 1
Views: 607

Practical Engineering Collaboration

We had fun over the last few weeks working on a collaboration with Grady from the awesome Practical Engineering YouTube channel. (https://www.youtube.com/user/gradyhillhouse)

My son John did the editing of our water rocket part of the video. :D

by air.command
Thu Mar 05, 2020 11:46 am
Forum: Rocketry Control Room
Topic: Australia's first ever moon bounce
Replies: 2
Views: 492

Re: Australia's first ever moon bounce

I also love the idea of his buzzer that he used to summon his wife when he needed her. That reminds me of my uncle in his 70's practicing for a flight from Europe to Oz by sitting in his easy chair for hours at a time and having Auntie bring him food, then take his tray away, bring him drinks every...
by air.command
Mon Mar 02, 2020 11:14 am
Forum: Mid/High Powered Rocketry
Topic: Derek's Level 2 Build
Replies: 44
Views: 5467

Re: Derek's Level 2 Build

Hi Derek, I've always used this formula for getting a rough estimate of descent rate. http://web.archive.org/web/20111018045919/http:/my.execpc.com/~culp/rockets/descent.html It's no longer on-line but available through the web archive. I think OpenRocket can also predict the descent rate based on p...
by air.command
Thu Jan 30, 2020 7:58 am
Forum: How's the Weather..?
Topic: I've had an interesting couple of months. (pic heavy)
Replies: 8
Views: 1655

Re: I've had an interesting couple of months. (pic heavy)

That's really cool Matthew! Thanks for sharing the details.
by air.command
Tue Jan 14, 2020 8:32 am
Forum: Kids Korner
Topic: Carbon dioxide cartridge rockets
Replies: 9
Views: 4571

Re: Carbon dioxide cartridge rockets

Very nice work Simon. Glad to see you had good fun with the water rocket. I was surprised at how well the camera survived on the rocket without a parachute. I hadn't seen these particular cameras before they look nice and compact, how much do they weigh?
by air.command
Thu Jan 09, 2020 7:44 pm
Forum: Australian Model Rocket Society
Topic: AMRS K Impulse Single Motor Altitude Record broken!
Replies: 4
Views: 1877

Re: AMRS K Impulse Single Motor Altitude Record broken!

That's an outstanding effort Warren! Congrats on the record flight.
by air.command
Fri Dec 20, 2019 11:01 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 7193

Re: Building a CF Tube

Hi Joe, Have a look here: https://www.sollercomposites.com/tow.html we have bought stuff from them before. They have quite reasonable prices. There is some fiberglass tow on that page, scroll to the bottom. It is interesting how they won't ship the high strength CF tow outside of the US.
by air.command
Mon Dec 02, 2019 1:23 pm
Forum: Mid/High Powered Rocketry
Topic: Derek's Level 2 Build
Replies: 44
Views: 5467

Re: Derek's Level 2 Build

Great update Derek! The fluro colours really stand out. I didn't realize that you had such problems with the fold in the sleeve. The carbon fiber sleeves we use have a similar fold, but we've never had an issue with it once it was wetted out and put on the mandrel. I'll have to keep your workaround ...
by air.command
Wed Nov 20, 2019 7:06 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3995

Re: Swirl injector for 4" hybird

Looking great! Will there be a seal of some sorts under the bolt head, or is the leakage around the thread insignificant?
by air.command
Tue Nov 05, 2019 6:43 pm
Forum: Mid/High Powered Rocketry
Topic: Derek's Level 2 Build
Replies: 44
Views: 5467

Re: Derek's Level 2 Build

That's an interesting design Derek. I don't think I have seen a motor mount go through the transition, but looks good! With a draggy back end like that, will you be using shear pins on the nosecone to avoid drag separation, especially if you end up adding nose weight?
by air.command
Thu Oct 31, 2019 10:36 pm
Forum: Air Command Water Rockets
Topic: Water Rocket Altitude Record
Replies: 6
Views: 3104

Re: Water Rocket Altitude Record

@SpaceManMat I believe that it's possible. I think I have read that some people have created motor files for their water rockets to simulate in OR. It would be nice to be able to just set the parameters in the program itself. I think it was one of the future plans they have listed: Planned future fe...
by air.command
Tue Oct 08, 2019 9:44 am
Forum: Air Command Water Rockets
Topic: Water Rocket Altitude Record
Replies: 6
Views: 3104

Water Rocket Altitude Record

We had the opportunity to fly our rocket at the last NSWRA's Mullaley HPR launch. Here is a video of a couple of those flights: OTArDzG2veg We're working on a follow up video that has a closer look at the data from these flights and how it compares to simulations. We're now going start focusing on b...
by air.command
Sun Oct 06, 2019 2:35 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 7193

Re: Building a CF Tube

That tube turned out really nice joeman, well done! The epoxy to resin ratio is great. If you are adding epoxy to the outside I would recommend mixing it with microballoons before applying, that way you get a lighter weight finish and easier to sand as well. Though you would need to paint it a solid...
by air.command
Tue Oct 01, 2019 1:35 pm
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 33
Views: 29514

Re: Horizon - 2 Stage Water Rocket

When good water rockets turn bad, they are turned to the dark side:


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