Re: [Phys-l] outdoor experiments

[chuck britton <cvbritton@mac.com>]

This months AJP has an article comparing theory and high speed video 
of the 2 liter bottle water rocket. The measured launch g's are 
considerably higher than predicted (with simplistic equations-of 
course).

They stick with a 50% fill ratio. I'm not convinced that 50% is optimum.
I prefer a release mechanism that allows for reproducible pressures as well.


At 2:35 PM -0700 3/14/10, Marc \"Zeke\" Kossover wrote:
> Water and air rockets are very nice.
>
> This Water Rocket launcher from Pitsco is very reliable and pretty 
> tough. They sell cheaper models though. Figuring out the optimum 
> amount of water is pretty cool and it isn't terribly hard to use a 
> rocket site to measure how high the rocket went. High speed 
> photography is also pretty cool for measuring speeds along the 
> flight.
>
> <http://shop.pitsco.com/store/detail.aspx?CategoryID=145&by=9&c=1&retest=1&bhcp=1&ID=1179>