How loud is a PressureJet?
Moderator: Mike Everman
-
- Posts: 49
- Joined: Sat Aug 14, 2004 6:35 pm
- Antipspambot question: 0
- Location: Cambridge, Ontario, Canada
How loud is a PressureJet?
Just a quick question for anyone who has ever heard a PressureJet run.
How loud is a PressureJet in comparison to a PulseJet?
How loud is a PressureJet in comparison to a PulseJet?
Jim
-
- Posts: 35
- Joined: Tue Dec 21, 2004 11:07 pm
- Antipspambot question: 0
- Location: Pennsylvania, USA
- Contact:
Re: How loud is a PressureJet?
http://www.rqriley.com/gluharef.html
On that page is a video of a pressue jet running, also is just the audio of that video.
-------------------------
http://www.dangerouslaboratories.org/
On this page there is also video and audio.
On that page is a video of a pressue jet running, also is just the audio of that video.
-------------------------
http://www.dangerouslaboratories.org/
On this page there is also video and audio.
-
- Posts: 2158
- Joined: Sat Oct 04, 2003 2:35 pm
- Antipspambot question: 125
- Location: Normandy, France, Wales, Europe
- Contact:
Re: How loud is a PressureJet?
A 130R running at 145 lbs of thrust produces 150 dba at 1 metre from the exhaust.PulseDuuude wrote:Just a quick question for anyone who has ever heard a PressureJet run.
How loud is a PressureJet in comparison to a PulseJet?
Also if you stand at 45 deg to the exhaust from about ten feet it affects your breathing as you can feel the vibrations in your chest!
In comparison a Rolls Royce Derwent jet engine only produces 130 dba at 1 metre from the tail pipe (measured at 45 deg)
The BCVP mark 5.1 attracted the attention of a small somerset suberb when it first ran much the detriment of the two experimentors:-) think of a field artilery peace firing once a second and you get the idea:-)
A pulse jet should not be operated with out hearing protection as even a small one will produce enough sound energy to affect your hearing, most of them would breach any industrial safety regulations you care to mention.
Viv
"Sometimes the lies you tell are less frightening than the loneliness you might feel if you stopped telling them" Brock Clarke
Viv's blog
Monsieur le commentaire
Viv's blog
Monsieur le commentaire
-
- Posts: 49
- Joined: Sat Aug 14, 2004 6:35 pm
- Antipspambot question: 0
- Location: Cambridge, Ontario, Canada
Re: How loud is a PressureJet?
Thank you!
Now I know what one sounds like...and have had my hopes dashed for a 'quiet' engine.....
Now I know what one sounds like...and have had my hopes dashed for a 'quiet' engine.....
Jim
-
- Posts: 3542
- Joined: Sat Oct 04, 2003 7:31 am
- Antipspambot question: 0
- Location: Zagreb, Croatia
Re: How loud is a PressureJet?
As I read on a rocketry website -- I am quoting from memory -- "Jet engines are very noisy; rockets are still noisier, but pulsejets re-define noise."PulseDuuude wrote:Now I know what one sounds like...and have had my hopes dashed for a 'quiet' engine.....
People say that the pressure jet is about as noisy as a pulsejet. Given that it is a kind of pulsejet, I am not surprised.
Still, 150 dB... powerful stuff. If we could only turn that sound energy into a propulsion force more effectively...
-
- Posts: 5007
- Joined: Fri Oct 31, 2003 7:25 am
- Antipspambot question: 0
- Location: santa barbara, CA
- Contact:
Re: How loud is a PressureJet?
There's a guy making whistles that will compete with that! Actually, 135 db at 100 feet away! Yikes. That's a real attention getter, and it's reason for existence.
- Attachments
-
- fluepipe1014001.jpg (93.09 KiB) Viewed 21889 times
Mike Often wrong, never unsure.
__________________________
__________________________
Re: How loud is a PressureJet?
Hi PulseDuuude,
A 357 magnum hand gun is 140 dBA at the same one meter from your hears. Now, multiply this by 136 puslsation per second (136 Hz, which is average pressure jet operation cycle) and you get a big noise generator.
Hope this answers it all.
Cya,
Luc
To complete Viv's comment, a pressure jet, as I have measured is 150 dBA at one meter.PulseDuuude wrote:Just a quick question for anyone who has ever heard a PressureJet run.
How loud is a PressureJet in comparison to a PulseJet?
A 357 magnum hand gun is 140 dBA at the same one meter from your hears. Now, multiply this by 136 puslsation per second (136 Hz, which is average pressure jet operation cycle) and you get a big noise generator.
Hope this answers it all.
Cya,
Luc
Luc
Designer & Inventor
Designer & Inventor
Re: How loud is a PressureJet?
Here's my 140 dBA.
Mark
Mark
- Attachments
-
- 050113151050.jpg (109 KiB) Viewed 21806 times
Presentation is Everything
Re: How loud is a PressureJet?
Wow, gun laws here have softend me, I actually took a double take after half choking lol. That's a nice pea shooter : oP
Tom
Tom
Experience speaks more then hypothesizing ever can. More-so in chemistry.
Re: How loud is a PressureJet?
Wowwww,
Nice gun Mark.
Correct me if I am wrong ... This is a Dan Wesson .357 mag. or a Smith & Wesson Cobra .357 mag.
My father has both Dan Wesson .357 and 44 Mag. But I still have a hard time differenciating both the Cobra and the Dan Wesson.
Nice gun Mark.
Cya,
Luc
Nice gun Mark.
Correct me if I am wrong ... This is a Dan Wesson .357 mag. or a Smith & Wesson Cobra .357 mag.
My father has both Dan Wesson .357 and 44 Mag. But I still have a hard time differenciating both the Cobra and the Dan Wesson.
Nice gun Mark.
Cya,
Luc
Luc
Designer & Inventor
Designer & Inventor
-
- Posts: 1029
- Joined: Sun Jun 06, 2004 12:29 am
- Antipspambot question: 0
- Location: Clinton Conneticut / Melbourne Flordia
- Contact:
Re: How loud is a PressureJet?
C'mon Mark! If you were a real man you would have a chopped SW 500 ;-)
(those guys at smith & wesson are nuts! they are just asking to be sued for broken wrists etc.)
(those guys at smith & wesson are nuts! they are just asking to be sued for broken wrists etc.)
- Attachments
-
- tb_lg_SWM500_lg.jpg (39.27 KiB) Viewed 21772 times
Re: How loud is a PressureJet?
Mine is a 357 Smith and Wesson. The little snub nose one is probably better balanced. Mine feels kind of heavy.
I use to go target shooting and shot my brother's 44 magnum. It's funny, shooting a large puddle from a fair distance with the 44, I remember it launching a large beam of water straight up, it's interesting to think about what's going on there.
Mark
I use to go target shooting and shot my brother's 44 magnum. It's funny, shooting a large puddle from a fair distance with the 44, I remember it launching a large beam of water straight up, it's interesting to think about what's going on there.
Mark
Presentation is Everything
-
- Posts: 5007
- Joined: Fri Oct 31, 2003 7:25 am
- Antipspambot question: 0
- Location: santa barbara, CA
- Contact:
Re: How loud is a PressureJet?
Same reason craters are always round, no matter at what angle the meteorite came in. Can't remember why, though.
Mike Often wrong, never unsure.
__________________________
__________________________
-
- Posts: 4140
- Joined: Sun Oct 05, 2003 1:17 am
- Antipspambot question: 0
- Location: Mingo, Iowa USA
- Contact:
Re: How loud is a PressureJet?
I beg to differ. In my 1884 version of Steele's Astronomy, there is a carefully drawn landscape of the lunar surface clearly showing craters pointing up at interesting angles.Mike Everman wrote:Same reason craters are always round, no matter at what angle the meteorite came in. Can't remember why, though.
It also explains that the sun is probably a huge ball of coal burning in the air of space.
L Cottrill
-
- Posts: 5007
- Joined: Fri Oct 31, 2003 7:25 am
- Antipspambot question: 0
- Location: santa barbara, CA
- Contact:
Re: How loud is a PressureJet?
I sit corrected. :-)
Mike Often wrong, never unsure.
__________________________
__________________________