Possible BBB 2016 project

[Julian]

This looks like fun.  A vacuum cannon ....



http://www.thingiverse.com/thing:959221

https://vimeo.com/135655056

We'd need it bigger, much bigger.

I have a small vacuum pump (if it still works) or Frankinpump can pull about 27" Hg on my venturi.

[Head Womble]

Is a clear tube and vacuum pump a good idea at the BBB, just the what knighty would do with it.

[oakwoodtv]

I have two fridge vacuum pumps / compressors and a LPG tank that will hold a vacuum
is that any good for a start.

Also ten air bags in stock waiting for ideas can have over fifty for the next BBB.     

[Julian]

I have two fridge vacuum pumps / compressors and a LPG tank that will hold a vacuum
is that any good for a start.

Also ten air bags in stock waiting for ideas can have over fifty for the next BBB.   

Sounds like a great start!

Anyone any ideas on the physics involved ... I'm guessing the limiting factor is the vacuum which can be pulled, but a longer tube would store a larger (or is it lesser) vacuum and power the projectile over a greater distance.

The projectile could be a sealed fit in the tube and contain a NRV to let the vacuum to the front.

[oakwoodtv]

How about a 12 foot scaffold pipe. 

[Keef]

I've got a big vacuum pump in the garage somewhere from a machine we broke up at work.

I'll try and find it and get some specs next time I'm in there.

[GedsJeep]

i got a sort of reverse one of them already....


https://www.youtube.com/watch?v=LZ-PSGjg3dk

uses the same membrane type to cause the explosion/amplify the effect.

although a builders concrete bag is the same.

i can fire the rocket about 150 foot straight up.....

[knighty]

even better.... we can all print a bunch of the little rocket thingies, then shoot them at a target, best shot wins ?

Is a clear tube and vacuum pump a good idea at the BBB, just the what knighty would do with it.

even better idea, we have a vote then someone (womble) wakes up inside this...

EBAY LINK (not rude.... but don't look if your kids can see the screen)

[greasemonkey]

even better idea, we have a vote then someone (womble) wakes up inside this...

EBAY LINK (not rude.... but don't look if your kids can see the screen)

Please tell me that is not a real thing.......

[kamaangir]

You sick perv Alan!!

In anticipation of the next years BBB funbag explosions, I bought an arduino atmeg yesterday, loads of IO's on it so we could rig it up and do somesort of choreographed routine! 50 is good.... But more would be better. I will get scrounging. 

[Dickjotec]

i got a sort of reverse one of them already....


https://www.youtube.com/watch?v=LZ-PSGjg3dk

uses the same membrane type to cause the explosion/amplify the effect.

although a builders concrete bag is the same.

i can fire the rocket about 150 foot straight up.....

I have a similar on to that but it is better! Charge up a cylinder then fire it with a button. Used to use it with the kids to shoot at other teachers. Went down very well. Very easy to make if anyone is interested. Kids design and make the rockets to get as accurate as possible.

[knighty]

Please tell me that is not a real thing.......

I have no idea, found it when i was searching for a gimp mask on ebay so I could send someone the link as a joke :-o