Date: Thu Oct 29 12:09:18 2009 ** **Back to Contents ** ------------------------------------------------------------------------ **

Author: Wayne Easterling

Subject: Re: Vacuum Bazooka and clear PVC

Post:

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Hi Cliff,

Very nice setup! What was used for the collar that the
vacuum line threads into? It looks to be ABS that you needed to machine
some.

Wayne

=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of cbettis@unlserve.unl.edu
Sent: Thursday, October 29, 2009 8:33 AM
To: tap-l
Subject: [tap-l] Vacuum Bazooka and clear PVC

=20


I wanted to let you all know that McMaster-Carr is now selling the clear
PVC pipe in 8 foot lengths so you can make a bazooka with just a single
length of it. Here is a picture of my implementaion:

https://physicslearning2.colorado.edu/image/displayimage.php?album=3D4&po=
s
=3D1=20

This is the vacuum valve:

https://physicslearning2.colorado.edu/image/displayimage.php?album=3D4&po=
s
=3D2

This is the arrow point I use to puncture the tape:

https://physicslearning2.colorado.edu/image/displayimage.php?album=3D4&po=
s
=3D0

This the container I use for safe storage of the arrow point:

https://physicslearning2.colorado.edu/image/displayimage.php?album=3D4&po=
s
=3D3

Using photogates, I measured the ping pong ball's exit velocity. With
just a puff of breath propelling it, it was 6 m/s; using the vacuum pump
and the pressure of the inrushing atmosphere when the tape is punctured,
it was 300 m/s.

Cliff


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**

**Hi = Cliff,**

** = Very nice setup! What was used for the collar that the
vacuum line = threads into? It looks to be ABS that you needed to
machine = some.**

**Wayne******

** **

**
------------------------------------------------------------------------
**

***From:* tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
*On Behalf Of = *cbettis@unlserve.unl.edu
*Sent:* Thursday, October = 29, 2009 8:33 AM
*To:* tap-l
*Subject:* [tap-l] Vacuum = Bazooka and clear PVC**

** **

**
I wanted to let you all know that McMaster-Carr is now selling the clear
= PVC pipe in 8 foot lengths so you can make a bazooka with just a
single = length of it. Here is a picture of my implementaion:

https://physicslearning2.colorado.edu/image/displayimag=
e.php?album=3D4&pos=3D1
<3D"https://physicslearning2.colorado.edu/image/displayimage.php?albu=> **

**This is the vacuum valve:**

**https://physicslearning2.colorado.edu/image/displayima=
ge.php?album=3D4&pos=3D2
<3D"https://physicslearning2.colorado.edu/image/displayimage.php?albu=>**

**This is the arrow point I use to puncture the tape:**

**https://physicslearning2.colorado.edu/image/displayima=
ge.php?album=3D4&pos=3D0
<3D"https://physicslearning2.colorado.edu/image/displayimage.php?albu=>**

**This the container I use for safe storage of the arrow = point:**

**https://physicslearning2.colorado.edu/image/displayima=
ge.php?album=3D4&pos=3D3
<3D"https://physicslearning2.colorado.edu/image/displayimage.php?albu=>**

**Using photogates, I measured the ping pong ball's exit velocity. With
just a = puff of breath propelling it, it was 6 m/s; using the vacuum
pump and the = pressure of the inrushing atmosphere when the tape is
punctured, it was 300 = m/s.**

**Cliff**



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From tap-l-owner@lists.ncsu.edu Thu Oct 29 12:09:18 2009
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