[Phys-L] Re: Vacuum Cannon Question

[sampere <sampere@PHYSICS.SYR.EDU>]

Another good question for tap-l and another reason you should subscribe.
You need to buy 40 mm ping ping balls, they also come in 38 mm (don't
get those). You can get 'em at: http://www.totaltabletennis.com/  I
order from them because they are very close by.

Sam

Matt Coia wrote:

> I have been using the regular ol' 2" 3M #371 packing tape in my trials
> this past week.  I have to double it up to prevent "blow-ins" but I still
> get a pretty good seal...sometimes too well.  My current problem is the
> ping-pong balls I'm using...they're crap....dollar store...kinda smooshy.
> I managed a pretty decent dent in a can today but nothing close to
> splitting it open like Dick Peterson's does.
>
> Any other input would be greatly appreciated.
>
> Matt Coia
> undergrad gadget person
> Buffalo State College