Horizon - 2 Stage Water Rocket

Water Rockets NSW

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air.command
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Horizon - 2 Stage Water Rocket

Postby air.command » Fri Dec 08, 2017 2:35 pm

Howdy,

We are starting on a new project that we hope to either fly at Thunda or earlier in Mullaley if we get it done in time. Here is a bit of an intro to what it looks like.



The booster will have around 810Ns of total impulse so in the J class motor category, and the sustainer will be an H class motor equivalent. We've been working on this one for a while so have made some progress, but there is still a very long way to go. We will be making build progress videos as we go, so I will post them here as well.

We also need to build a new launcher that will be remotely controlled because we don't want to be anywhere near this thing when it is up to pressure. The two scuba tanks will be located at the pad rather than having a long hose going to the rocket.

- George
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CATO
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Re: Horizon - 2 Stage Water Rocket

Postby CATO » Sat Dec 09, 2017 6:41 am

8)
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2019: 7,898 Ns (54% M)
Ns 18: 14,767; Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: Horizon - 2 Stage Water Rocket

Postby SpaceManMat » Sat Dec 09, 2017 9:16 am

This is going to be interesting, can’t wait for the next vid.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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Re: Horizon - 2 Stage Water Rocket

Postby Digit » Mon Dec 11, 2017 10:30 pm

Awesome stuff George, looking forward to seeing this high performance build!
"There are very few personal problems that cannot be solved through a suitable application of high explosives"— Scott Adams

QRS:169
AMRS:108 (L2)

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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Tue Jan 09, 2018 8:44 am

Here is the next installment in the series. In this video we discuss the design concept behind the staging mechanism for the rocket. We also do a couple of low pressure test flights to test the concept.



In the next video we'll have a look at how we modify this design to work with the Horizon rocket and also have a look at actual flight hardware.
Crop Circles: ... just a bunch of guys looking for their rockets ....

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Re: Horizon - 2 Stage Water Rocket

Postby SpaceManMat » Tue Jan 09, 2018 6:51 pm

Nice video George, lots of great silence and that upper stage really went.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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Re: Horizon - 2 Stage Water Rocket

Postby CATO » Sun Jan 14, 2018 8:58 am

:D
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2019: 7,898 Ns (54% M)
Ns 18: 14,767; Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

air.command
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jun 22, 2018 9:23 am

It's been a while since I have updated this thread. We're continuing to make good progress on this rocket, and with Thunda less than a year away we need to push a little more. Here are parts #3 and #4 of the series. Part #5 should be out next week.



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Re: Horizon - 2 Stage Water Rocket

Postby OverTheTop » Fri Jun 22, 2018 10:47 am

Absolutely amazing as always George 8)

Not only is the rocket professionally produced, so are the videos!
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L3
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Fri Jun 22, 2018 11:16 pm

Thanks for the nice words OTT. Dad and I are having fun building this rocket together.
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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Mon Jul 16, 2018 2:50 pm

Here are the next two parts of the series.
Part 5 is about building a test stand to apply forces (up to 10kN) to different components before we subject them to compressed air.


Part 6 describes the overall launcher design and also how we made the release head that holds down the entire rocket.


There isn't a whole lot of time before Thunda, only like 40 weekends or so left.
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Re: Horizon - 2 Stage Water Rocket

Postby SpaceManMat » Tue Jul 17, 2018 8:14 pm

Great work as usual, see you at thunda.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Thu Jun 13, 2019 7:50 pm

It's been quite a while since I updated this thread so for completeness, I am including the videos of the next parts of the project including the new one we released today.

Part #7 - Details of the plumbing that goes in the air control box.


Part #8 - Making and testing test pressure chambers.


Part #9 - Prototyping the launcher electronics


Part #9b - Quick update, including the easy way to make nozzles


Part #10 - Completing the launcher electronics, and testing the whole launcher


Part #11 - The latest video on making the sustainer's pressure chamber's inner liner.


I am currently editing the next video in the series on the sustainer's deployment mechanism.
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Re: Horizon - 2 Stage Water Rocket

Postby strud » Thu Jun 13, 2019 9:25 pm

Awesome work George!

I really like how the whole family is involved :-)

You have given me some ideas for a fincan / rear module of my 4" rocket that will include a boatail. The carbon sock looks like a fantastic way to deal with tapers etc.

Which 'weight' sleeving are you using? ie 3,6,12k?

A question about post curing, do you do any?

What pressure do you intend to take these tubes up to?

How many pressure cycles do you think they will be good for?

It is also giving me some ideas for integral composite oxidiser tanks for hybrids, although a higher factor of safety and work on oxidiser compatibility would be required...

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Re: Horizon - 2 Stage Water Rocket

Postby air.command » Thu Jun 13, 2019 10:29 pm

strud wrote:Awesome work George!

I really like how the whole family is involved :-)

You have given me some ideas for a fincan / rear module of my 4" rocket that will include a boatail. The carbon sock looks like a fantastic way to deal with tapers etc.

Which 'weight' sleeving are you using? ie 3,6,12k?

A question about post curing, do you do any?

What pressure do you intend to take these tubes up to?

How many pressure cycles do you think they will be good for?

It is also giving me some ideas for integral composite oxidiser tanks for hybrids, although a higher factor of safety and work on oxidiser compatibility would be required...


Thanks Craig,

For this inner liner we are using the 2" 3K sleeves for both rockets. Then for the re-enforcing sleeve that goes over the top of this we used the same light 3K sleeve on one rocket, and a heavy 12K sleeve on the other. (this will be shown in an upcoming video) We wanted to compare the strength to weight ratios of the two on an actual air frame. The reinforcing sleeve is a single sleeve that goes all the way from the nozzle to the tip of the pressure chamber.

We don't do any post curing as we use West Systems epoxy and my understanding is there is no gain in improved properties from a post cure. Though I am considering switching to something like Araldite 3600 and then doing a post cure. I would also love to give vacuum forming a go to improve the resin/fiber ratio though I am not sure how you would get it off the mandrel. I had a really hard time removing a 1 foot test section that I just wrapped with electrical tape to try to compress the sleeve. Perhaps the liner wouldn't be vacuum formed, but the reinforcing sleeve would be.

The final target launch pressure for the reinforced rockets is 1000psi. We have done non-destructive hydro tests on the two finished airframes to 900psi. A short test chamber with the two 3K sleeves held 1250psi fine.
In an earlier test on a short test chamber with the 12K sleeve we had it up to 1500psi without bursting though it developed a leak in the endcap wall. After that test we modified how we make the endcaps and haven't had a leak since (the new process is shown in the last video above).

The number of pressure cycles is a good question. The short answer is I don't know, but I believe dozens at a minimum. Our Dark Shadow rocket which has a fiberglass inner liner and a 12K carbon sleeve has had around 8 cycles so far. (500-900psi range)
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