Don't go sit next to the engines in such a plane. Unless it is made of
yet.
Project "Pluto" in the late '50s through '64. The engine (a ramjet,
APDS (I think) = Armor-Piercing Discarding-Sabot rounds areOn Thu, 10 Jun 2004 10:46:03 +1000, ClkineticHeath
cjh-nospam@nospaManagesoft.com> wrote:
John Larkin wrote:
The gears are just too tempting a tagret for sabatoge.
sabotage - the word has an interesting etymology.
A "sabot" is a wooden shoe, so named by the French peasants
who wore them. We know them as clogs, and tend to associate
them more with the Dutch. Anyhow... during the Industrial
Revolution, "saboteurs" became so-called from their practise
of throwing a sabot into the gears of the machinery, thereby
"clogging up the works" and often breaking the gears.
Irrelevant to electronics, but the kind of thing that geeks
and engineers like to know.
Clifford Heath.
Isn't a sabot also the drop-away casing used on those
hypervelocity uranium tank-killer shells?
Technically, the word is spelled "flechette". Another kind of thing thatJohn Larkin wrote:
On Thu, 10 Jun 2004 10:46:03 +1000, ClkineticHeath
cjh-nospam@nospaManagesoft.com> wrote:
John Larkin wrote:
The gears are just too tempting a tagret for sabatoge.
sabotage - the word has an interesting etymology.
A "sabot" is a wooden shoe, so named by the French peasants
who wore them. We know them as clogs, and tend to associate
them more with the Dutch. Anyhow... during the Industrial
Revolution, "saboteurs" became so-called from their practise
of throwing a sabot into the gears of the machinery, thereby
"clogging up the works" and often breaking the gears.
Irrelevant to electronics, but the kind of thing that geeks
and engineers like to know
Clifford Heath.
Isn't a sabot also the drop-away casing used on those
hypervelocity uranium tank-killer shells?
APDS (I think) = Armor-Piercing Discarding-Sabot rounds are
kinetic-energy killers. The penetrator is necessarily a dense
material, usually either depleted uranium or tungsten. Note that
shot-guns may also use sabots for flechetes. I guess one could
think of the patch around a musket ball as a sabot too. ;-)
What do they call that thing where the projectile from a big
ripping the fan off a vacuum cleaner motor so it runs unloaded is fun too -
horsepower constant, then reducing the rpm by half will cause the torque to
Yep, the same as my US Navy. But the lower-level watch changes the main
Depends on the situation I guess. IMA and 'depot' level maintenance opens
Yes, "The Undiscovered Country". When coming up with an excuse why theClifford Heath <cjh-nospam@nospaManagesoft.com> wrote:
sabotage - the word has an interesting etymology.
...
Irrelevant to electronics, but the kind of thing that geeks
and engineers like to know
Yep, but surely most proper geeks and engineers would have learned it from
Star Trek... uh... VI, I think it was?
Interesting. Sort of a turbine assisted ramjet.
IIRC, sabotage, saboteur and the like come from the french word for
Actually, I knew that (flechette, a small or feminine flech"K Williams" <krw@adelphia.net> wrote in message
news:Fbidna08Bb-SLFXdRVn-jg@adelphia.com...
John Larkin wrote:
On Thu, 10 Jun 2004 10:46:03 +1000, ClkineticHeath
cjh-nospam@nospaManagesoft.com> wrote:
John Larkin wrote:
The gears are just too tempting a tagret for sabatoge.
sabotage - the word has an interesting etymology.
A "sabot" is a wooden shoe, so named by the French peasants
who wore them. We know them as clogs, and tend to associate
them more with the Dutch. Anyhow... during the Industrial
Revolution, "saboteurs" became so-called from their practise
of throwing a sabot into the gears of the machinery, thereby
"clogging up the works" and often breaking the gears.
Irrelevant to electronics, but the kind of thing that geeks
and engineers like to know
Clifford Heath.
Isn't a sabot also the drop-away casing used on those
hypervelocity uranium tank-killer shells?
APDS (I think) = Armor-Piercing Discarding-Sabot rounds are
kinetic-energy killers. The penetrator is necessarily a dense
material, usually either depleted uranium or tungsten. Note that
shot-guns may also use sabots for flechetes. I guess one could
think of the patch around a musket ball as a sabot too. ;-)
Technically, the word is spelled "flechette". Another kind of
thing that geeks and engineers like to know (more the meaning of
than the spelling).
, butNever heard of such a thing. I've heard of rockets being fired out
"Tzortzakakis Dimitrios" <dimtzortihatespam@nospamotenet.gr> wrote in
message news:ca47nd$ehr$1@usenet.otenet.gr...
Are you joking?GEARED?Steam turbine?They are on a single-cast shaft.THAT
shaft is expensive, thus it connects the turbine and generator.Imagine a
gear for 2,500,000 hp (usual power of a nuclear plant generator).The
generator and turbine are designed to run at the same speed.Even train
locomotives use diesel-electric transmission, and the traction motors
are
directly coupled on the wheels.So must be happening at the ships, too.
Hate to burst your bubble, but they *do* make gearing for this kind of
power. Typical steamships use reduction gears between the IP/LP turbines
(in thousands of RPM) and the main shaft (hundreds of RPM). And smaller
gearing between the HP and IP turbines. Bull-gears, the final output gear
connected to the propeller shaft are large with double helix cut. Often
use
double-reduction with 'quill' shafts between successive gear stages.
Saw more than one bull gear get some broken teeth ground out. Didn't
replace the teeth, just ground down the sharp edges so they wouldn't wear
into the low-speed pinions (some sailors didn't believe the rules about
FOD). Some marine applications include clutches that can carry over 35000
hp. These ain't your standard automobile clutch, they have dozens of
friction plates and positive, splined-sleeve engagement.
Large stationary power plants have the HP and LP turbines co-linear with
the
generator, that is true. But the 'shaft' is made up of several pieces,
one
for each turbine section and another for the generator. Each section is
bolted to the next with flat-faced, bolted couplings. One plant (I think
in
Korea) a year or so back had a failure where a fire in one bearing support
caused it to sieze. The shaft twisted right apart and in the process
threw
pieces/parts all around the turbine building. The pictures were *very*
impressive.
Get a couple of mechanical engineers together in a room and they can come
up
with things almost as outlandish and exotic as any EE's
daestrom
------------DaveC wrote:
After watching the PBS special on the building of the ocean liner Queen
Mary
II, I have no question of the size that electric motors that can be
built.
Three (or is it four) huge motors in rotating pods push this behemoth
ship at
record speeds across the Atlantic.
But how fast can an electric motor potentially turn (though not
necessarily
the ones that drive the QMII)? Examples on-line?
I don't know if this represents any kind of upper limit, but the US Navy
is working with American Supercondustors on a 36.5 megawatt motor for
ship propulsion.
http://www.amsuper.com/
--
Paul Hovnanian mailto
note to spammers: a Washington State resident
------------------------------------------------------------------
You can discover what your enemy fears most by observing the
means he uses to frighten you. -- Eric Hoffer
The problem is that a jet turbine has a better power/weight ratio than anOn Mon, 7 Jun 2004 11:24:48 -0700, Tim Wescott wrote
(in article <10c9cn7hrsm07cb@corp.supernews.com>
You could get around the magnetic problem with a pneumatic motor -- the
rim of your 2cm rotor is only traveling at 100 m/s, which is only 225
miles per hour, after all.
The thing that prompted my original question was seeing that QMII
documentary. I began wondering if air flight could ever use electric
motors
to drive turbines that would provide equivalent thrust of jet turbine
engines
(let's put aside the question of a source of electric power; for now,
let's
say it's infinite).
I realize that low-speed electric motors could drive propellers, but is
there
any hope of an electric motor being able to drive a high-speed turbine?
-----------------------------------
Qtzc.720482$Pk3.142266@pd7tw1no...I have worked with 3MVA pump motors (big pumps) and a friend of mine built a"Paul Hovnanian P.E." <Paul@Hovnanian.com> wrote in message
news:40C4AD17.57627DB1@Hovnanian.com...
DaveC wrote:
After watching the PBS special on the building of the ocean liner
Queen
Mary
II, I have no question of the size that electric motors that can be
built.
Three (or is it four) huge motors in rotating pods push this behemoth
ship at
record speeds across the Atlantic.
But how fast can an electric motor potentially turn (though not
necessarily
the ones that drive the QMII)? Examples on-line?
I don't know if this represents any kind of upper limit, but the US Navy
is working with American Supercondustors on a 36.5 megawatt motor for
ship propulsion.
http://www.amsuper.com/
--
Paul Hovnanian mailto
------------
There are motors which exceed 100MVA - and 50MVA is relatively common but
not at all small.
As for speed- I don't know the limits- but the problems become basically
mechanical rather than electrical.
--
Don Kelly