(Eugene Griessel) wrote in message om...
Alan Minyard wrote in message . ..
On 18 Jan 2004 21:48:27 -0800, (robert arndt) wrote:

Merlin Dorfman wrote in message ...
Eugene Griessel ) wrote:

...

: Mmmmm - the steel piston which ran in the tube of the V1 launch ramp
: and was powered by steam was quite a a long object. About 16 foot or
: somewhere thereabouts. It would be interesting to see how this worked
: in a curved steel tube.

Is there a Web resource that explains how the V1 was boosted
into the air? Was the pulse jet engine capable of being started on
the ground or was it started after the missile had attained a
certain air speed?
Thanks.


The Argus-Schmidt pulsejet was incapable of launching the V-1 by
itself so a steam-driven piston got it moving off the launch ramp at
an appreciable speed which gave enough forward energy to open the duct
flaps and commence the pulse detonation cycle.
The V-1 firing on the ramp does not mean it was operable. It was fired
for exactly 7 seconds to warm it up to operating temperature.
Afterwards, T-Stoff and Z-Stoff were remotely pumped into the steam
generation vessel. Pressure built up until it was sufficient to shear
a restraining bolt sending the launch piston up the tube carrying the
launch trolley and missile with it. By the time it reached the end of
the track (.5 seconds later) the missile had been accelerated at a
rate of 16g up to 250 mph with the pulse jet running independently.
On another thread there is dispute that a pulsejet is a form of
ramjet. I think the description of the firing of the V-1 proves
otherwise.

Rob

Wrong. The V-1 engine could operate at zero velocity, thus it was
definitely NOT a "ram jet". No one, other than herr Arndt, referrers
to a V-1 as having a "ram jet" engine.

Al, I suggest you put your prejudice aside for a moment, reread the
last paragraph and then, after wiping the egg of your face, apologise.

Eugene

The Germans made several types of pulse jet both valveless and valved,
some which could resonate at zero intake velocity and auto ignite from
compression detonation. Post war a US company called Hillier
experimented with these and these are the basis of the pulse jets seen
on "Junkyard Wars".

The V1s engine as I recall reading somewhere could opperate
sustainably from the low velocity of about 20mph. Hence it could
preumably be opperated by a modest fan or a compressed air hose while
stationary.

The Germans also made ram jets. Most opperated well at around 200m/s
or 440mph. Infact the Germans developed supersonic diffusers for ram
jet cannon shells to allow ram jets to opperate at supersonic Mach 2+
speeds. The intake spike you seen on a Talos/Tartar missile, Sea Dart
Missile or SR71 intake derives from German ram powered cannon shell
research.

One type of ram jet known as an inductor ram jet used a small rocket
motor inside. This fired while ramjet was stationary and induced an
airflow which could burn a pure fuel in a secondary combstiuon zone.
Once at speed the rocket was switched of. Stationay thrust was about
100kg and full speed thrust was about 130kg on the test model I am
recollecting. I believe stationary specific fuel plus oxidiser
consumptioin was 700 seconds which is 1.5 times as good as the shuttle
enignes, 4 times as good as WW2 contempoary rocket engines but about
1/3rd of the thirsty turbojets of the day.

At one point the Germans were planning to used liquid fuel inductor
ramjets that burned powdered coal in the secondary zone. If you've
seen how effective blown powdered coal burners are in locomotives
(Henschell sold such equipement) or power stations (it goes of
vigorously) then this is quite feasable assuming the coal handing
equiment can be made compact enough. (other coal fired ramjet ideas
used a porus powdered sponge coal called schaumkhole cast into a
anulus and another Lippisch designe even used a Griticule Bed.

One promising designe was for an oxidiser and rocket free
monopropellant inductor ramjet. Alcahol fuel (which was resitant to
carbonisation and thermal cracking) was heated in a monotube
boiler/tube sorounding the ramjet body. It was then flashed into
high pressure vapour that provided thrust and induced a secondary
airflow. Once at speed a more energy dense fuel could be used.

This design was not practicable becuase of the sensitivity of thrust
and fuel flow control with the systems of the day. I suspect it
would be easy for the controls of today.