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by air.command
Fri Aug 09, 2019 9:04 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 35
Views: 2647

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

Thanks for posting Drew ... that is some anomaly.
by air.command
Tue Aug 06, 2019 3:36 pm
Forum: Scratch Built
Topic: L3 Cert - 1/2 scale Patriot
Replies: 339
Views: 61284

Re: L3 Cert - 1/2 scale Patriot

+1 8)
by air.command
Mon Jul 22, 2019 8:27 am
Forum: How to's
Topic: Building a CF Tube
Replies: 33
Views: 2079

Re: Building a CF Tube

by air.command
Sat Jul 20, 2019 5:22 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 33
Views: 2079

Re: Building a CF Tube

by air.command
Fri Jul 19, 2019 11:51 am
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 25
Views: 26476

Re: Horizon - 2 Stage Water Rocket

The PLA+ that I have I don't like. It seems to have quite poor adhesion to the bed, and even inter-layer adhesion didn't seem that good. Now perhaps I need to change some settings on the printer, but so far I am not impressed. I don't remember the manufacturer, I would have to check tonight. I did a...
by air.command
Fri Jul 19, 2019 8:36 am
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 25
Views: 26476

Re: Horizon - 2 Stage Water Rocket

The quality of your 3d prints look superb George. What printer and filament are you using? Did you do lots of finishing work? We are using the Maker Gear M2 ( https://www.makergear.com/products/m2 ) We bought it because it had good print quality reviews ( https://www.3dhubs.com/3d-printers/makergea...
by air.command
Thu Jul 18, 2019 9:15 am
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 25
Views: 26476

Re: Horizon - 2 Stage Water Rocket

Here is a video that describes the parachute deployment mechanism for the sustainer. The internal structure is mostly 3D printed. We tried 3D printing the nosecone outer shell as well, but found that the fiberglass is a lot stronger and lighter. The whole thing is designed to handle accelerations of...
by air.command
Fri Jul 05, 2019 6:47 pm
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

Looking like good progress there strud. When I once made up a wooden plug that was too small, I just wrapped one layer of light fiberglass on it to make it a little wider. That way it gave a nice even layer thickness all around. Then I just filled and sanded it to a smooth finish. I also gave it a c...
by air.command
Wed Jul 03, 2019 9:08 pm
Forum: Rocketry Control Room
Topic: Orion Launch Abort
Replies: 3
Views: 188

Orion Launch Abort

Found a good picture of the launch abort tower sitting above the Orion spacecraft. It's much bigger than I thought.

Image
Image from spaceflightnow.com.
by air.command
Tue Jun 25, 2019 8:44 pm
Forum: News & Events
Topic: SpaceX details its plans for landing 3 Falcon Heavy boosters
Replies: 63
Views: 7569

Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

It will be quite interesting to see what happened. The plume at first looked like it was centered on the ship, but then you see it powering away from the ship with legs deployed. I wonder if one of the engines stopped, I believe it was a three engine landing.
by air.command
Tue Jun 25, 2019 6:14 pm
Forum: News & Events
Topic: USYD Rocketry Team Win 10k' Challenge at IREC
Replies: 13
Views: 525

Re: USYD Rocketry Team Win 10k' Challenge at IREC

That's awesome news. Congratulations to the whole team. What a remarkable result. :shock:
by air.command
Mon Jun 24, 2019 2:22 pm
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

Looking good! What do you fill and seal your wood plug with? What will you use as a final top coat on the plug before using any release agents?
by air.command
Wed Jun 19, 2019 8:10 pm
Forum: I could use that
Topic: Carbon pricing etc
Replies: 12
Views: 547

Re: Carbon pricing etc

Thanks Drew, that's good to know. Will definitely order narrower cloth to reduce shipping costs next time.
by air.command
Fri Jun 14, 2019 3:42 pm
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 25
Views: 26476

Re: Horizon - 2 Stage Water Rocket

Hi George, Maybe to assist with mandrel removal, you can make up some flush or internal caps for the PVC mandrel, put some fittings in them and run a low (say 2 bar?) pressure on the tube during curing (with a vacuum sleeve/heat shrink etc) on the outer. Then after initial cure, drop the pressure f...

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