[TheForge] Re: morphed GAS FORGE QUESTION

[Justin Fellenz]

Ron,

When I first put the thing together I dialled up 15lb of gas and put a
squirrel cage blower on that is about 6" diameter by 8" wide...and I
had a blue afterburner jet out the port about 5' long. Andrea dubbed it
"my little box of hell." It was LOUD. I swapped blowers to one about 4"
wide by 5" diameter, which I fancy is about the recommended 105 ppm,
and dialled back to 3-4lb of gas. Now I can actually put things in the
port and hear people talk. As for "pretty quiet" I can take a video in
the next couple of days and put it on my site so you can compare, if
you like. I use 3/4" black pipe for the gas (except for the line form
the tank, which is 3/8" flex) so I think I have relatively high
volume/gas speed, but it speeds up when it goes through the 3/8"
injector nipples.

Cheers,

JRF
--- Ron Childers <munlaw2 at hcsmail.com> wrote:

> Ok, Murph, I'm painted into a corner- Help! Justin said his blown
> forge is
> "Pretty quiet", but he did say *small* blower...I think the roar is
> the
> burning gasses coming out of the chamber so wall thickness shouldn't
> be a
> factor....??? Also, would a 3 burner manifold have anything to do
> with the
> noise level?
> 
> Ron C
> 
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Justin Fellenz
> Sent: Tuesday, October 05, 2004 2:16 PM
> To: pesetsky at Princeton.EDU; Sponsored by ABANA
> Subject: RE: [TheForge] Re: morphed GAS FORGE QUESTION
> 
> My homebuilt blown forge (mankel 3-burner manifold with a small
> squirrel cage blower) is pretty quiet actually, through no good
> planning of my own. It's got thick walls, 2 1/2" of 2800 degree fire
> brick and castable doors the same thickness. Maybe that's what
> muffles
> it. I run it at 3-4 lb gas and the air comes through a 6" flex hose
> about 3' long. Dunno.
> 
> JRF
> --- "Mark A. Pesetsky" <pesetsky at Princeton.EDU> wrote:
> 
> > 
> > 
> > 
> > Roger,
> > 
> >  I don't think it is possible to quiet a blown forge to the decibel
> > level of
> > an atmospheric forge. I used Murph's atmospheric forge in a demo a 
> > few months ago and it was great. I could hear questions and they
> > could hear
> > answers. I used a blown forge in a demo last month and it sounded
> > like an
> > F-14 - couldn't hear it thunder. My blown forge is noisy but
> > efficient - I
> > may try your muffler idea and see if there is any difference
> > 
> > Ron C 
> > 
> > 
> > Is there a link showing the Murph forge design?
> > 
> > I think the forced air sounds cool. But in a teaching environment I
> > wouldn't
> > want one...
> > 
> > Mark
> > 
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