Pulse Jets

A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. I'm also rather intrigued that it was felt to be a safe
enough gadget to build for the TV show.

It was an amazingly simple contraption, a jet with no moving parts. I
was wondering where I could find out more about the history of these
devices, and perhaps some information as to why they are apparently
outdated and no longer in use. I believe they were used in the V2
rockets in WWII (?).

http://www.pulse-jets.com/forumforside.asp

all the stuff youd like to know about pulsejets and related such things......

of course half is good and half is horse manure.....the rest is up to you

take care

Blll

http://www.pulse-jets.com/forumforside.asp

all the stuff youd like to know about pulsejets and related such things......

of course half is good and half is horse manure.....the rest is up to you

take care

Blll

Try typing "pulse jet" into your favorite search engine. That will get
you more information than you can assimilate in a few days.


Ray


"pervect" wrote in message
...
A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. I'm also rather intrigued that it was felt to be a safe
enough gadget to build for the TV show.

It was an amazingly simple contraption, a jet with no moving parts. I
was wondering where I could find out more about the history of these
devices, and perhaps some information as to why they are apparently
outdated and no longer in use. I believe they were used in the V2
rockets in WWII (?).

Try typing "pulse jet" into your favorite search engine. That will get
you more information than you can assimilate in a few days.


Ray


"pervect" wrote in message
...
A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. I'm also rather intrigued that it was felt to be a safe
enough gadget to build for the TV show.

It was an amazingly simple contraption, a jet with no moving parts. I
was wondering where I could find out more about the history of these
devices, and perhaps some information as to why they are apparently
outdated and no longer in use. I believe they were used in the V2
rockets in WWII (?).

In sci.space.tech pervect wrote:
A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. I'm also rather intrigued that it was felt to be a safe
enough gadget to build for the TV show.

It was an amazingly simple contraption, a jet with no moving parts. I
was wondering where I could find out more about the history of these
devices, and perhaps some information as to why they are apparently
outdated and no longer in use. I believe they were used in the V2
rockets in WWII (?).

V1 "doodlebug" in WWII.
The V2 was a rocket.
Do a search for
"bruce simpson" pulsejet
(bruce was the team-leader in that episode, and has a website on pulsejets.)

A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. BRBR

I'm curious why the pulse-jet keeps cropping up in discussions of possible or
alleged advanced high-speed aircraft. Isn't the thing inefficient as heck?


Matt Bille
)
OPINIONS IN ALL POSTS ARE SOLELY THOSE OF THE AUTHOR

In article ,
MattWriter wrote:
I'm curious why the pulse-jet keeps cropping up in discussions of possible or
alleged advanced high-speed aircraft. Isn't the thing inefficient as heck?

Pulsejets and Pulse Detonation Engines are completely different devices,
despite the similarity in name and the vague similarity in operating
principle.

(One important difference is that pulsejets went from concept to flying
hardware very quickly, while PDEs have been The Engine Of The Future for
nearly half a century now.)
--
MOST launched 30 June; first light, 29 July; 5arcsec | Henry Spencer
pointing, 10 Sept; first science, early Oct; all well. |

In article ,
MattWriter wrote:
I'm curious why the pulse-jet keeps cropping up in discussions of possible or
alleged advanced high-speed aircraft. Isn't the thing inefficient as heck?

Pulsejets and Pulse Detonation Engines are completely different devices,
despite the similarity in name and the vague similarity in operating
principle.

(One important difference is that pulsejets went from concept to flying
hardware very quickly, while PDEs have been The Engine Of The Future for
nearly half a century now.)
--
MOST launched 30 June; first light, 29 July; 5arcsec | Henry Spencer
pointing, 10 Sept; first science, early Oct; all well. |

On 06 Dec 2003 02:36:54 GMT, (MattWriter) wrote:

A week or so ago I saw a rather neat Junkyard Wars episode on
pulse-jets. BRBR

I'm curious why the pulse-jet keeps cropping up in discussions of possible or
alleged advanced high-speed aircraft. Isn't the thing inefficient as heck?

Yes, conventional pulsejets are as inefficient as heck -- maybe even
less efficient than heck :-)

What pulsejets do have going for them however are the attributes of
cost and simplicity. You can build a pulsejet that produces around
200lbs of thrust for under $200 -- there's no other engine on the
planet that will produce more thrust per dollar (that I can think of).

What's more, you can make that engine out of plain old sheets of
stainless steel -- with out the need for CNC machining, expensive
bearing assemblies/balancing, etc.

Obviously therefore, on short-range "disposable" craft, the pulsejet
is a very cost-effective option.

The other reason pulsejets are experiencing something of renaissance
is the huge mount of money and effort being invested into PDEs (Pulse
Detonation Engines).

PDEs offer the promise of very efficient propulsion for supersonic
craft but are currently still, based on all the examples I've seen and
the research I've read -- quite a few years away from being actually
viable for such applications.

There's more info on PDEs and pulsejets on the website I mentioned in
my last posting.

--
you can contact me via http://aardvark.co.nz/contact/