Horizon - 2 Stage Water Rocket

Water Rockets NSW

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CATO
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Re: Horizon - 2 Stage Water Rocket

Postby CATO » Fri Jun 14, 2019 10:01 am

Hi George,

You need to put some chlorine in your pool mate.... :-)
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3


strud
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Re: Horizon - 2 Stage Water Rocket

Postby strud » Fri Jun 14, 2019 12:36 pm

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 from the mandrel then pull a vacuum (or maybe it's not required) to give you the reduction in diameter to assist with withdrawal.

Alternatively you could let the whole thing sit in the sun to cure (PVC expanded from increased temp) then remove from mandrel first thing in the morning or put in an cool room (AC) before removal.

Aquaman33
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Re: Horizon - 2 Stage Water Rocket

Postby Aquaman33 » Fri Jun 14, 2019 3:09 pm

Another great video George.

A wonderful resource for anyone that has some sleeves on order! :D

air.command
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jun 14, 2019 3:42 pm

Crop Circles: ... just a bunch of guys looking for their rockets ....

strud
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Re: Horizon - 2 Stage Water Rocket

Postby strud » Fri Jun 14, 2019 6:38 pm

Usually these epoxies will cure at room temp to some degree or maybe you need to ensure they get to say 40degC to have enough stiffness to be self supporting. At those temps you could still leave it on the mandrel ie after pulling it off and removing the glad bake etc

How would you heat that tube length?

air.command
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jun 14, 2019 7:05 pm

Crop Circles: ... just a bunch of guys looking for their rockets ....

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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Thu Jul 18, 2019 9:15 am

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 100G+.

Crop Circles: ... just a bunch of guys looking for their rockets ....

Aquaman33
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Re: Horizon - 2 Stage Water Rocket

Postby Aquaman33 » Fri Jul 19, 2019 8:15 am

The quality of your 3d prints look superb George.

What printer and filament are you using?

Did you do lots of finishing work?

air.command
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jul 19, 2019 8:36 am

Crop Circles: ... just a bunch of guys looking for their rockets ....

Aquaman33
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Re: Horizon - 2 Stage Water Rocket

Postby Aquaman33 » Fri Jul 19, 2019 11:45 am


air.command
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jul 19, 2019 11:51 am

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 few test prints with it, but haven't used it since.
Crop Circles: ... just a bunch of guys looking for their rockets ....


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