Welcome to the Water Rocket Forum, sponsored by The Water Rocket Achievement World Record Association.

Since our founding in 2003, we've become the largest, most sophisticated and ground breaking group supporting you, the serious water rocket flyer! Whether you are a beginner or an expert, the WRA2 has something for everyone.

A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

competition for water rocket cars.

Discussions about water rocket powered cars, sleds or boats.
User avatar
RaZias
WRA2 Member
WRA2 Member
Posts: 751
Joined: Mon Jul 14, 2008 3:16 pm

Re: competition for water rocket cars.

Post by RaZias » Wed Feb 25, 2009 10:37 am

Check this site:

posting.php?mode=reply&f=3&t=457

Its a water_rocket car around a skate with a person on it.
H2Orocket.car[1].jpg
You do not have the required permissions to view the files attached to this post.


Research and Development is the soul of WR

Andrewlee
WRA2 Member
WRA2 Member
Posts: 65
Joined: Mon Feb 23, 2009 3:33 am

Re: competition for water rocket cars.

Post by Andrewlee » Thu Feb 26, 2009 5:28 am

Now that's what I call ingenuity . Looks like fun too


"Speak softly, but carry a big stick"
-Andrew Lee

http://thruststormrockets.blogspot.com/

User avatar
Spaceman Spiff
WRA2 Member
WRA2 Member
Posts: 681
Joined: Sat Feb 24, 2007 11:06 am

Re: competition for water rocket cars.

Post by Spaceman Spiff » Thu Feb 26, 2009 1:10 pm

Andrewlee wrote:Now that's what I call ingenuity . Looks like fun too
I think there's a distance competition in the U.K. for water rocket cars. I saw it on TV a few months ago. They didn't go very far at all!


Spaceman Spiff
"What goes up, must come down"

Andrewlee
WRA2 Member
WRA2 Member
Posts: 65
Joined: Mon Feb 23, 2009 3:33 am

Re: competition for water rocket cars.

Post by Andrewlee » Thu Feb 26, 2009 3:51 pm

That's because they don't have any of us working on their side to help design and operate the vehicle. I'm sure with some more efficiently free spinning wheels, a lighter base, and some rework on the pressure vessel and nozzle, we could have them going a fair distance.


"Speak softly, but carry a big stick"
-Andrew Lee

http://thruststormrockets.blogspot.com/

User avatar
RaZias
WRA2 Member
WRA2 Member
Posts: 751
Joined: Mon Jul 14, 2008 3:16 pm

Re: competition for water rocket cars.

Post by RaZias » Sun Jul 12, 2009 9:41 am



Research and Development is the soul of WR

User avatar
thampson
Current WRA2 Dragster Speed & Distance Record Holder
Current WRA2 Dragster Speed & Distance Record Holder
Posts: 230
Joined: Wed Jul 16, 2008 8:19 am

Re: competition for water rocket cars.

Post by thampson » Mon Jul 27, 2009 10:23 am

HI guys,

Its been a while since I posted but I did see this thread so I thought I would add some content as well. We have been working on a wrocket car over the last few weeks. It started off as a science experiment with my son (fellow wrocket builder and tester) and it has evolved from there.

We started off with a school demonstration so stability and predictability was the key before speed. When we built small light cars they were unpredictable, shooting off up in the air, left, right .. you name it. We ended up with a car that would go pretty much where we wanted, but rear end stability in high thrust siutaions was an issue.

We have worked on it to get it going pretty much straight now. Our highest launch pressures are 140psi with a 2.25L bottle. We have quite a few videos on our website of the launches as well and the development we went through.

We have just this weekend put together a 2 bottle wrocket car which we will be testing this weekend to make a 4.5L wrocket car. I will have some pics up soon on this car

We have found it very interesting to see how the wrocket differs when in a horizontal position, such as

- the ability to use much more water than when launching vertical
- the way the water and air mix under acceleration
- the lack of an air pulse
- the way a fin will work at lower speeds

Also its a good development platform for testing real wrockets without crashing them, just strap them to the wrocket body and go test. Especially deployment systems.

We have found we can go out, spin, roll and smash up the wrocket car and there is no real damage done. We have been able to come home from every launch in the last 4 weeks and not had to rebuild wrockets, we could just continue to develop the car.

A category on this forum for wrocket cars would be welcome .... there is definatley as much science and development work involved in getting a wrocket car performing as there is in working on a vertical water rocket I can assure you :)

-todd-
HHWRSA


HHWRSA
Hornsby Heights Water Rocket Space Agency
http://wrocket.hampson.net.au

User avatar
Tim Chen
WRA2 Member
WRA2 Member
Posts: 871
Joined: Wed Jan 31, 2007 1:44 am

Re: competition for water rocket cars.

Post by Tim Chen » Mon Jul 27, 2009 11:31 am

I'd like to see more about water rocket cars on the forum too. I don't know many people doing this but if you think about it you don't need a huge field to launch a car from so more different people would be able to experiment with cars than with places or vertical water rockets.

Sounds like a good plan, Todd!


Tim Chen
Captain, Team Enterprise

User avatar
WRA2
Site Admin
Site Admin
Posts: 1058
Joined: Sat Dec 30, 2006 11:30 pm

Re: competition for water rocket cars.

Post by WRA2 » Mon Jul 27, 2009 3:46 pm

thampson wrote:
A category on this forum for wrocket cars would be welcome .... there is definatley as much science and development work involved in getting a wrocket car performing as there is in working on a vertical water rocket I can assure you :)

-todd-
HHWRSA
Here you go, a separate category for water rocket powered cars. I added boats too as the principles would be similar (although a boat would probably require a tiny nozzle). What might be interesting to see someone build would be a paddle boat powered by compressed air (anyone out there building one).

Welcome back Todd! :W


Lisa Walker,
:WRA2: Forum Administrator. :WRA2:
:WRA2:The Water Rocket Achievement World Record Association :WRA2:

User avatar
RaZias
WRA2 Member
WRA2 Member
Posts: 751
Joined: Mon Jul 14, 2008 3:16 pm

Re: competition for water rocket cars.

Post by RaZias » Mon Jul 27, 2009 4:21 pm

WRA2 wrote:
thampson wrote:
A category on this forum for wrocket cars would be welcome .... there is definatley as much science and development work involved in getting a wrocket car performing as there is in working on a vertical water rocket I can assure you :)

-todd-
HHWRSA
Here you go, a separate category for water rocket powered cars. I added boats too as the principles would be similar (although a boat would probably require a tiny nozzle). What might be interesting to see someone build would be a paddle boat powered by compressed air (anyone out there building one).

Welcome back Todd! :W
Since I live near the sea that has given me an interesting idea. Thanks for that !


Research and Development is the soul of WR

User avatar
thampson
Current WRA2 Dragster Speed & Distance Record Holder
Current WRA2 Dragster Speed & Distance Record Holder
Posts: 230
Joined: Wed Jul 16, 2008 8:19 am

Re: competition for water rocket cars.

Post by thampson » Mon Jul 27, 2009 8:56 pm

Lisa,

thanks for creating the new category, that was fast. :)

I will be happy to add some more content on wrocket car development to encourage work in this area in the coming weeks.

Its always great to get new ideas with people work on solving the same problems different ways.

-todd-


HHWRSA
Hornsby Heights Water Rocket Space Agency
http://wrocket.hampson.net.au

Team Water Birds
WRA2 Member
WRA2 Member
Posts: 1
Joined: Sat Aug 28, 2010 10:26 am

Re: competition for water rocket cars.

Post by Team Water Birds » Mon Sep 06, 2010 6:33 pm

We have been doing some digging into this subject and have found a couple of interesting sites.
Check out this Estes rocket car. http://myemrr.com/reviews/all/est_blurzz.shtml
It even comes with a digital speedometer for speed measurements.
http://www.estesrockets.com/assets/inst ... y_Cars.pdf

Here is the Tripoli rocket car rules.
Possibly a layout with classes like this could be figured out.
http://www.the-rocketman.com/rocketcar_rules.html

Cool stuff for sure.

-Tom



User avatar
thampson
Current WRA2 Dragster Speed & Distance Record Holder
Current WRA2 Dragster Speed & Distance Record Holder
Posts: 230
Joined: Wed Jul 16, 2008 8:19 am

Re: competition for water rocket cars.

Post by thampson » Wed Sep 08, 2010 11:24 am

Tom,

thanks for the links you posted. I did read that the Tripoli rules mandate the use of a guide wire, so does the model you posted the link to as well.

We have found that a large percentage of the engineering effort with water rocket cars is controlling them. The use of wires seems to take a lot of this away. Having said that, its a great way to quickly get a water rocket car going and once the basics of the car are operational then the wire can be removed and the other aspects of car control can then be engineered.

We started with 1 bottle, 4 wheels and a piece of plywood and have worked up to the current 3 bottle car. You can learn a lot from testing a 1 bottle car, in fact what we learnt on the one bottle car allowed us to move up to the 2 and 3 bottle cars. Its also a lot of fun try to think through the problems, engineer a solution and get out there and give it a test.

We would love to see more water rocket cars on the forum so if you do build one we would love to see the results..

cya
-todd-
HHWRSA


HHWRSA
Hornsby Heights Water Rocket Space Agency
http://wrocket.hampson.net.au

Post Reply