On 18 Jan 2004 17:56:31 -0800, (robert arndt) wrote:

"Kevin Brooks" wrote in message t...
"robert arndt" wrote in message
om...
Alan Minyard wrote in message
. ..
On 16 Jan 2004 22:22:15 -0800, (robert arndt) wrote:

(WaltBJ) wrote in message
. com...
Eyeballing those pictures of the As044 and the Pabst ramjet - IMHO
the
AS044 is a pulse jet (else why the square grilled inlet?) and the
Pabst ramjet is a neat way to convert fuel into smoke and noise. Its
specific fuel consumption (Kg fuel/newton/hr) must have been very
high
indeed. I believe the ramjet fighter as pictured would have had a
range even less than that of the Me163b. (Little volume for fuel.)
Doubtless why it never made it off the sketch board.
Walt BJ

Walt,

As for the Fw Ta 283 range question: the plane had enough fuel (1000+
liters) for 40 minutes of sustained flight. It's climb would have been
around 17,500 fpm using the Walter rocket motor in the tail plus the
two ramjets. So you would have less than two minutes of climb to get
over the bomber stream and then dive down for the attack. I doubt the
escort fighters would have been able to do anything about it until the
Ta 283 had to land. More of the aircraft would have probably been lost
to ground accidents as the Ta 283 had very narrow track landing gear.

Rob

Well, the V-1 used the same type of pulse jet, and they were routinely
shot down. The pulse jet was a dead end technology.

And it is NOT a form of "ram jet".

Al Minyard

snip

Third, the pulsejet IS a form of ramjet, with intermittent combustion
vs continuous. It cannot operate until it reaches a certain airspeed.
In the Ta 283 this would be accomplished by the Walter rocket in the
tail.

Not true. Pulse jets can begin operation at zero-airspeed. Interesting photo
of one doing so on this page:

http://www.aardvark.co.nz/pjet/

I'd be reluctant to call a pulse jet a "form of ramjet", being as the latter
DOES require tremendous forward airspeed and usually relies on no external
ignition source for the development of thrust other than the compression of
the airflow.

Brooks

Rob

The Germans defined the ramjet as a propulsive duct or athodyd motor.
The As044 is defined as an intermittent propulsive duct motor
(translation: intermittent ramjet).

- from "Jane's Fighting Aircraft of World War 2"

Rob

No one cares what the Nazis called it, they lost. It was not
a ram jet.

Al Minyard