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

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.

250 psi compressors review

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
User avatar
RaZias
WRA2 Member
WRA2 Member
Posts: 751
Joined: Mon Jul 14, 2008 3:16 pm

Re: 250 psi compressors review

Post by RaZias » Fri Jun 04, 2010 4:45 pm

Ok so here is some "12v compressor Anatomy"...it will explain to you why a compressor like this can go only to 180 psi...and how to teorically make more pressure than that one.
new.jpg
Foto329.jpg
You do not have the required permissions to view the files attached to this post.


Research and Development is the soul of WR

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

Re: 250 psi compressors review

Post by RaZias » Wed Jun 09, 2010 6:03 am

Here is a message from USWR about a test with a 300 psi compressor that had better results than the others:


We indeed have tested compressors, but had superior results with only one model:
the Campbell Hausfeld RP300001AV - 12 volt 300PSI inflator.
It was marked that it was made in China.

Here is the exact same model for sale on ebay:

http://cgi.ebay.com/Campbell-Hausfeld-1 ... 4a9d9a7bb0

We were able to reach 250PSI and 290PSI with two of these units before they failed. We reported on our website the test results: http://www.uswaterrockets.com/business/ ... ory_01.htm

In both cases the plastic gears were the ultimate weak point. Initially, the hose clamps would fail quite easily, perhaps as a safety blowoff, but once that was corrected they ran until the plastic gears melted. One pump ground the gears and the other one had the gears fuse together and bind up until the motor burned out.

We have a video on our website of the burning motor.

In the extended version of this same video the pressure causes the test pressure vessel we were experimenting with to fail. The video shows how far the needle travels when the pressure lets go. You can see that the pressure was 290 by how far the needle goes down.

We will try to locate the video and post it to the forum.


Research and Development is the soul of WR

User avatar
U.S. Water Rockets
WRA2 Member
WRA2 Member
Posts: 399
Joined: Tue Jan 30, 2007 8:16 pm

Re: 250 psi compressors review

Post by U.S. Water Rockets » Sun Jun 13, 2010 2:15 am

RaZias wrote:Here is a message from USWR about a test with a 300 psi compressor that had better results than the others:


We indeed have tested compressors, but had superior results with only one model:
the Campbell Hausfeld RP300001AV - 12 volt 300PSI inflator.
It was marked that it was made in China.

Here is the exact same model for sale on ebay:

http://cgi.ebay.com/Campbell-Hausfeld-1 ... 4a9d9a7bb0

We were able to reach 250PSI and 290PSI with two of these units before they failed. We reported on our website the test results: http://www.uswaterrockets.com/business/ ... ory_01.htm

In both cases the plastic gears were the ultimate weak point. Initially, the hose clamps would fail quite easily, perhaps as a safety blowoff, but once that was corrected they ran until the plastic gears melted. One pump ground the gears and the other one had the gears fuse together and bind up until the motor burned out.

We have a video on our website of the burning motor.

In the extended version of this same video the pressure causes the test pressure vessel we were experimenting with to fail. The video shows how far the needle travels when the pressure lets go. You can see that the pressure was 290 by how far the needle goes down.

We will try to locate the video and post it to the forum.

The video has been located:

[youtube][/youtube]



Post Reply