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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.

which track pump

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
dongfang
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Re: which track pump

Post by dongfang » Mon Oct 13, 2008 4:56 am

Hi,

Sure I know of a place in Zürich where they have the SKS Rennkompressor. But I think you might find that in any really well-assorted, semi-snobbish store for serious racing bikes. It relly seems to be very good, although certainly not cheap.

Regards
Soren



160psi
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Re: which track pump

Post by 160psi » Sun Mar 01, 2009 8:07 am

Just an update to this post - I bought the Joeblow Ace in the end and after around 6 months of use it is brilliant - it inflates fast to around 60psi using both cylinders and then progressively more slowly using either the wide or narrow cylinder independantly - this pump is great for blowing apart all of your rockets if you are not careful! It is well made and has coped with beach sand well!



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Spaceman Spiff
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Re: which track pump

Post by Spaceman Spiff » Mon Mar 02, 2009 1:12 pm

160psi wrote:Just an update to this post - I bought the Joeblow Ace in the end and after around 6 months of use it is brilliant - it inflates fast to around 60psi using both cylinders and then progressively more slowly using either the wide or narrow cylinder independantly - this pump is great for blowing apart all of your rockets if you are not careful! It is well made and has coped with beach sand well!
Thanks for the update. Can you tell me weather or not a regular person can use this pump to get to a decent high pressure? I'm no Arnold Swarzenegger and don't want to throw my back out on a pump. Is it fairly easy or do you need to use a lot of effort?


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160psi
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Re: which track pump

Post by 160psi » Thu Mar 05, 2009 6:47 pm

When you use it on the lower pressures (ie high volume) it gets to be hard work at about 60psi, then you move it to the next stage and it gets hard at about 120psi. On the third stage it is dead easy all the time, pumps just a small amount of air but at very high pressure - my six year old can pump it on this setting easily. The stroke is much longer than other pumps I have used, which also gives you less backache (I am fairly tall). Hope this helps.



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Tim Chen
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Re: which track pump

Post by Tim Chen » Fri Mar 06, 2009 1:16 pm

160psi wrote:When you use it on the lower pressures (ie high volume) it gets to be hard work at about 60psi, then you move it to the next stage and it gets hard at about 120psi. On the third stage it is dead easy all the time, pumps just a small amount of air but at very high pressure - my six year old can pump it on this setting easily. The stroke is much longer than other pumps I have used, which also gives you less backache (I am fairly tall). Hope this helps.
Hi! Can you tell me if the pump switches automatic from one mode to another or is there some kind of valve or something you need to move to make the transition from lower to higher pressure operation?


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160psi
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Re: which track pump

Post by 160psi » Sat Mar 07, 2009 5:39 am

there is a lever switch on the handle, manually operated.



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