Date: Fri Mar 13 12:50:38 2009 Back to Contents ------------------------------------------------------------------------

Author: Richard Heckathorn

Subject: Re: Ruben's tube and propane

Post:

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Greetings,

=20

I use the small cylinders (1 lb) propane when I do
not have natural gas. I have had no problems. As
stated earlier, I need to constantly monitor the
flame and adjust the pressure as necessary. The
holes in my pipe are 1/16 inch in diameter and one
inch apart. If I had to do it over, I would space
them closer together as when some are blown out,
they do not relight on their own. Would also make
the holes smaller in diameter. I also have two gas
inputs. They are 1.5 ft from each end of a 6 ft
long, 4 inch diameter tube. (I would also make it
10 feet long.)

=20

=20

Only one concern. The first time I used propane,
put the tube in the car to bring it home, a smell
of gas developed in the car. Then I remembered,
propane is denser than air. It had remained in the
tube. Placing it at an angle so the gas would exit
the tube before putting it in the car solved the
problem.=20

=20

If you go to my website listed below, click on
demonstrations, then click on Gas Flame tube you
will see my directions for construction and some
things to do with it.

=20

I did make another Ruben tube out of 1 inch inside
diameter, 4 ft long aluminum pipe. Drilled the
holes 1 cm apart with a diameter about 0.5 mm.
Don't remember the size of the bit I used. I am
not pleased with it. The only gas input is at one
end. Also the vibrating area, is small. The power
rating of the speaker is 15 normal to 30 watts.=20

=20

If you have Physics Demonstration Experiments by
Harry Meiners, you will find information beginning
on page 495. Their pipe was 8 ft long, 4 inch in
diameter galvanized downspout. The drilled 59 (#54
drill) 1.5 inches apart. Only input was from one
end.

=20

Hope this helps.

=20

Dick

=20

Helping teachers who facilitate, motivating
students who learn.

Dick Heckathorn 14665 Pawnee Trail Middleburg
Hts, OH 44130 440-826-0834

http://web.cvcaroyals.org/~rheckathorn/ =20

Adjunct Physics Teacher - Baldwin Wallace College

Physics is learning how to communicate with ones
environment so that it will talk back.

=20

=20

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of
cbettis@unlserve.unl.edu
Sent: Friday, March 13, 2009 9:59 AM
To: tap-l
Subject: [tap-l] Ruben's tube and propane

=20

One of our faculty wants to use my Ruben's tube as
part of a road show =20

to a high school. The school does not have a
natural gas source for =20

him so he wants to rent a propane tank to fuel the
tube. I am =20

concerned about: how well this will work, as I
seem to remember that =20

propane requires different sized orifices for
flame jets than natural =20

gas, safety (a tank of gas under pressure near an
open flame in front =20

of a large audience) and finally, in our lecture
hall use, I find I =20

have to turn off our air handlers to reduce air
currents in the room =20

so the flames are stable.

=20

So I was wondering if any of you had experience
using the Ruben's tube =20

on the road in such circumstances and had any
advice for me to pass =20

along.

=20

Cliff

=20


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Greetings,



I use the small cylinders (1 lb) propane when I do not have = natural
gas. I have had no problems. As stated earlier, I need to constantly =
monitor the flame and adjust the pressure as necessary. The holes in my
pipe are = 1/16 inch in diameter and one inch apart. If I had to do it
over, I would = space them closer together as when some are blown out,
they do not relight on their = own. Would also make the holes smaller in
diameter. I also have two gas inputs. = They are 1.5 ft from each end of
a 6 ft long, 4 inch diameter tube. (I would also = make it 10 feet long.)





Only one concern. The first time I used propane, put the tube in = the
car to bring it home, a smell of gas developed in the car. Then I =
remembered, propane is denser than air. It had remained in the tube.
Placing it at = an angle so the gas would exit the tube before putting
it in the car solved the = problem.



If you go to my website listed below, click on demonstrations, = then
click on Gas Flame tube you will see my directions for construction and
= some things to do with it.



I did make another Ruben tube out of 1 inch inside diameter, 4 = ft long
aluminum pipe. Drilled the holes 1 cm apart with a diameter about 0.5 =
mm. Don?t remember the size of the bit I used. I am not pleased with it.
The only = gas input is at one end. Also the vibrating area, is small.
The power rating = of the speaker is 15 normal to 30 watts.



If you have Physics Demonstration Experiments by Harry Meiners, = you
will find information beginning on page 495. Their pipe was 8 ft long, 4
= inch in diameter galvanized downspout. The drilled 59 (#54 drill) 1.5
inches = apart. Only input was from one end.



Hope this helps.



Dick



Helping teachers who facilitate, motivating students who = learn.

Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, = OH 44130
440-826-0834

http://web.cvcaroyals.or= g/~rheckathorn/

Adjunct Physics Teacher - Baldwin Wallace = College

Physics is learning how to communicate with ones environment so = that
it will talk back.





-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
= Behalf Of cbettis@unlserve.unl.edu
Sent: Friday, March 13, 2009 9:59 AM
To: tap-l
Subject: [tap-l] Ruben's tube and propane



One of our faculty wants to use my Ruben's tube as part of a = road show

to a high school. The school does not have a natural gas source for

him so he wants to rent a propane tank to fuel the tube. I = am

concerned about: how well this will work, as I seem to remember that

propane requires different sized orifices for flame jets than natural

gas, safety (a tank of gas under pressure near an open flame in front

of a large audience) and finally, in our lecture hall use, I = find I

have to turn off our air handlers to reduce air currents in the room

so the flames are stable.



So I was wondering if any of you had experience using the = Ruben's tube

on the road in such circumstances and had any advice for me to pass

along.



Cliff





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From tap-l-owner@lists.ncsu.edu Fri Mar 13 12:50:38 2009

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