--Well it started out as a propane torch but it's morphed a bit.
Photos and text he http://www.nmpproducts.com/artcar0605.htm

--
"Steamboat Ed" Haas : Whatever happened
Hacking the Trailing Edge! : to Porgy Tirebiter?
www.nmpproducts.com
---Decks a-wash in a sea of words---

steamer wrote:

--Well it started out as a propane torch but it's morphed a bit.
Photos and text he http://www.nmpproducts.com/artcar0605.htm

--
"Steamboat Ed" Haas : Whatever happened
Hacking the Trailing Edge! : to Porgy Tirebiter?
www.nmpproducts.com
---Decks a-wash in a sea of words---

I think you just need a bigger flow path, all the propane mortars I've
seen had like 1.5" lines from the accumulator tank and 1.5" ball valves
actuated by an air cylinder for fast opening.

Pete C.

steamer wrote:

Pete C. wrote:

I think you just need a bigger flow path, all the propane mortars I've
seen had like 1.5" lines from the accumulator tank and 1.5" ball valves
actuated by an air cylinder for fast opening.
--Oh yeah! If I was using something bigger than a little 5 gallon
tank for my reservoir I'd be doing that, but as it is I'm just doing the
mostest with the leastest. Da plan is to make two units, fed off of the one
tank and to put one on each side of the art car, to be operated only
occasionally.
I'm new to all this; I've never heard the term "propane mortar"
before. Have you got any links to more info?

--
"Steamboat Ed" Haas : Whatever happened
Hacking the Trailing Edge! : to Porgy Tirebiter?
www.nmpproducts.com
---Decks a-wash in a sea of words---

I believe the term "propane mortar" is pretty standard in the movie and
entertainment special effects industry. I recall seeing the details of
one on TV (prob. Disc. chan) showing it's use in movie effects.

Found one site with a picture similar to what I've seen:

http://www.brucelawstunts.com/images...e_mortar_1.jpg

Doesn't seem to be a whole lot on the net about them, but certainly
they're pretty simple to clone when you see one.

Pete C.

Pete C. wrote:

steamer wrote:

Pete C. wrote:


I think you just need a bigger flow path, all the propane mortars I've
seen had like 1.5" lines from the accumulator tank and 1.5" ball valves
actuated by an air cylinder for fast opening.

--Oh yeah! If I was using something bigger than a little 5 gallon
tank for my reservoir I'd be doing that, but as it is I'm just doing the
mostest with the leastest. Da plan is to make two units, fed off of the one
tank and to put one on each side of the art car, to be operated only
occasionally.
I'm new to all this; I've never heard the term "propane mortar"
before. Have you got any links to more info?

--
"Steamboat Ed" Haas : Whatever happened
Hacking the Trailing Edge! : to Porgy Tirebiter?
www.nmpproducts.com
---Decks a-wash in a sea of words---


I believe the term "propane mortar" is pretty standard in the movie and
entertainment special effects industry. I recall seeing the details of
one on TV (prob. Disc. chan) showing it's use in movie effects.

Found one site with a picture similar to what I've seen:

http://www.brucelawstunts.com/images...e_mortar_1.jpg

Doesn't seem to be a whole lot on the net about them, but certainly
they're pretty simple to clone when you see one.

Common in orchards to scare away birds.

http://www.geocities.com/lgtngstk/Pr...oisemaker.html

"Pete C." wrote in message
...
I'm new to all this; I've never heard the term "propane mortar"

That term is commonly used, but it's not the most frequently used term for
that effect any more. Look up, also, "propane flame projector". They come
in a variety of PLC-controlled models designed to do anything from high,
tight-stream liquid shots to rapid strings of 'farts' with gaseous LP, and
they can be programmed to respond to the firing cues from other pyrotechnic
firing systems, so they can be integrated into multi-media shows. Some
versions "do it all" in one machine.

Most have historically used a MAPP gas pilot running off a small (14oz) MAPP
bottle or they've used a high-voltage continuous spark igniter, like from a
residential furnace. Both have distinct drawbacks.

I'm more partial to the units that use hot surface igniters sintered from
recrystallized carbide. They don't blow out, and don't create the RF noise
that spark units do (and which interferes badly with M.A.R.T.I. systems and
wireless mic's). They sometimes break during transport, even in a tough
'roady box', so you have to have spares around.

We use units that can consume a 30lb forklift cylinder worth of LP in two to
three minutes of continuous operation.

LLoyd