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nuckolls.bob(at)aeroelect Guest
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Posted: Fri Jul 15, 2011 9:42 am Post subject: It's nice when the center holds . . . |
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See:
http://www.patricksaviation.com/videos/SUPERGT/3384/
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
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trigo(at)mail.telepac.pt Guest
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Posted: Fri Jul 15, 2011 10:58 am Post subject: It's nice when the center holds . . . |
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Nice landing, and a very good demonstration of excellent pilot skills!
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
Carlos Trigo
[quote] --
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rhdudley1(at)bellsouth.ne Guest
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Posted: Fri Jul 15, 2011 11:16 am Post subject: It's nice when the center holds . . . |
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Hi Carlos,
The expression precedes the jet engine by many years. The "stick" was the propeller (most likely wood at that time), dead when engine (power source) stops.
Regards, Rich
On 7/15/2011 2:55 PM, Carlos Trigo wrote: [quote] st1\:*{behavior:url(#default#ieooui) } <![endif]-->
Nice landing, and a very good demonstration of excellent pilot skills!
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
Carlos Trigo
[b]
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mrspudandcompany(at)veriz Guest
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Posted: Fri Jul 15, 2011 12:03 pm Post subject: It's nice when the center holds . . . |
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The expression precedes the jet engine by many years. The
"stick" was the propeller (most likely wood at that time), dead when engine
(power source) stops.
I did not know this origin. Guess you can
always learn something here on the "Lectric List"
Roger
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henador_titzoff(at)yahoo. Guest
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Posted: Fri Jul 15, 2011 1:31 pm Post subject: It's nice when the center holds . . . |
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Richard Dudley is correct, Roger. Here is the Wiki explanation:
http://en.wikipedia.org/wiki/Deadstick_landing
Lesson learned: as old as we are, we still don't know everything. Thank you, Richard.
Carlos, I bet you have similar sayings in your country.
Henador Titzoff
From: ROGER & JEAN CURTIS <mrspudandcompany(at)verizon.net>
To: aeroelectric-list(at)matronics.com
Sent: Friday, July 15, 2011 3:55 PM
Subject: RE: It's nice when the center holds . . .
The expression precedes the jet engine by many years. The
"stick" was the propeller (most likely wood at that time), dead when engine
(power source) stops.
I did not know this origin. Guess you can
always learn something here on the "Lectric List"
Roger
[quote][b]
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gpabruce(at)gmail.com Guest
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Posted: Fri Jul 15, 2011 1:32 pm Post subject: It's nice when the center holds . . . |
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Quote: |
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
|
Excellent observation . . . . the question is, shall we go back and change all the references using the "dead stick" phrase from all the books references and logs or shall we allow you to get over it and accept it. One vs. zillions
As I recall in a my old conversations with the Wright Bothers it originally meant "you are close to being dead if you don't use the stick to save your ass". I remember asking that very same question to Orville and Wilbur while sitting around their potbellied stove as if it was yesterday. They reiterated that "dead" had nothing to do with the engine but more about the pilot.
So if you were them, what phrase would you like to use if we were to correct the whole 100 plus years of aviation history and all log books to reflect your choice of phrases? "Alive stick"?
This reminds me of the prison story where the new guy comes in and hears "257" and everyone laughs, then "522" and everyone laughs. He questions what is going on and his cell mate says, "we have told these jokes so many times we just numbered them to save time". The new guy says "let me try one . . . 257!" but nobody laughed . . . then "522" and once again nobody laughed . . . he asked his cell mate "what gives?"
The cell mate said, "some people can tell a joke and some can't!"
You can stick with "Alive stick" and see how it works for you however removing the word "dead" from your thoughts may not be as healthy at that particular time. . . please let us know how it works for you. You could just yell out "dead" and forget the stick if that confuses you. That way the "dead" will give you some indication of what happens if you don't move the stick in the proper, timely sequence.
Don't take it personal, I'm just having fun with you . . . Where are you from?
Bruce
On Fri, Jul 15, 2011 at 11:55 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
[quote]
Nice landing, and a very good demonstration of excellent pilot skills!
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
Carlos Trigo
[quote] --
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nuckolls.bob(at)aeroelect Guest
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Posted: Fri Jul 15, 2011 1:54 pm Post subject: It's nice when the center holds . . . |
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Quote: |
What is really dead is the power source! |
The last few words of the pilot suggested something I'd
not heard before. He talked about a 'hydrazine' hazard
around his aircraft as he was talking with locals at
his airport of destination. There was also a reference
to an "EPU" . . . 'possible emergency power unit'.
Hydrazine and sulfuric acid combine in a manner that
provides spontaneous combustion with a very energetic
release of energy. In this case, I'm thinking that the
airplane was fitted with what could be a compact
and relatively light weight energy source that required
very little maintenance and has a long storage life.
(I've seen AQM-37 hydrazine powered targets successfully
flown after 20 years in storage).
It would be interesting to hear from folks with experience
inside the operating world of this style of aircraft
as to it's 'dead stick' options for power.
Bob . . . [quote][b]
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trigo(at)mail.telepac.pt Guest
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Posted: Fri Jul 15, 2011 2:13 pm Post subject: It's nice when the center holds . . . |
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Sure we do Henador, but this one of yours seemed to be contradictory, thinking the stick could be the one you control your aircraft with. Now that I got the explanation that the dead “stick” is the propeller, it makes sense.
Here in Portugal we aviators use to say, when the engine stops, that we have a “fixed joist” in the nose…
Carlos
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Henador Titzoff
Sent: sexta-feira, 15 de Julho de 2011 22:26
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: It's nice when the center holds . . .
...................
Carlos, I bet you have similar sayings in your country.
Henador Titzoff
[quote] [b]
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ceengland(at)bellsouth.ne Guest
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Posted: Fri Jul 15, 2011 3:29 pm Post subject: It's nice when the center holds . . . |
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On 07/15/2011 04:47 PM, Robert L. Nuckolls, III wrote: Quote: | Quote: |
What is really dead is the power source! |
The last few words of the pilot suggested something I'd
not heard before. He talked about a 'hydrazine' hazard
around his aircraft as he was talking with locals at
his airport of destination. There was also a reference
to an "EPU" . . . 'possible emergency power unit'.
Hydrazine and sulfuric acid combine in a manner that
provides spontaneous combustion with a very energetic
release of energy. In this case, I'm thinking that the
airplane was fitted with what could be a compact
and relatively light weight energy source that required
very little maintenance and has a long storage life.
(I've seen AQM-37 hydrazine powered targets successfully
flown after 20 years in storage).
It would be interesting to hear from folks with experience
inside the operating world of this style of aircraft
as to it's 'dead stick' options for power.
Bob . . .
| Someone actually discusses the system in the comments below the video.
Charlie
[quote][b]
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Mauledriver(at)nc.rr.com Guest
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Posted: Fri Jul 15, 2011 3:48 pm Post subject: It's nice when the center holds . . . |
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On 7/15/2011 3:55 PM, ROGER & JEAN CURTIS wrote:
Quote: | The expression precedes the jet engine by many years. The
"stick" was the propeller (most likely wood at that time), dead when engine
(power source) stops.
I did not know this origin. Guess you can
always learn something here on the "Lectric List"
..and I've always known what it meant having been an RC enthusiast in
|
the '60s when 50% of landings were 'dead stick'.
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pwmac(at)sisna.com Guest
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Posted: Fri Jul 15, 2011 4:18 pm Post subject: It's nice when the center holds . . . |
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Bob,
APU is the aux power unit used to start the jet engine after
landing in the boondocks. N2H4 is a mono propellant and works great
with no other chemical, just a catalyst. Deadly stuff gives you cancer .
So inflight engine shutdown and the APU would not do the restart or
was defective. At least that is the way In understand the APU.
Lots of combat planes have the N2H4 APUs.
We use the stuff exclusively for satelite propulsion systems. That is
how we steer the spy satelites.
PaulW
========
At 03:47 PM 7/15/2011, you wrote:
Quote: | >What is really dead is the power source!
The last few words of the pilot suggested something I'd
not heard before. He talked about a 'hydrazine' hazard
around his aircraft as he was talking with locals at
his airport of destination. There was also a reference
to an "EPU" . . . 'possible emergency power unit'.
Hydrazine and sulfuric acid combine in a manner that
provides spontaneous combustion with a very energetic
release of energy. In this case, I'm thinking that the
airplane was fitted with what could be a compact
and relatively light weight energy source that required
very little maintenance and has a long storage life.
(I've seen AQM-37 hydrazine powered targets successfully
flown after 20 years in storage).
It would be interesting to hear from folks with experience
inside the operating world of this style of aircraft
as to it's 'dead stick' options for power.
Bob . . .
<http://www.matronics.com/Navigator?AeroElectric-List>http://www.matronics.com/Navigator?AeroElectric-List
<http://www.matronics.com/contribution>http://www.matronics.com/contribution
|
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peter(at)sportingaero.com Guest
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Posted: Sat Jul 16, 2011 1:49 am Post subject: It's nice when the center holds . . . |
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Bob,
I don't know F-16 systems, but have experience of other single seat military aircraft. I'm guessing the Hydrazine unit is a light weight method of mitigating the hazard of providing power once the (single) motor has stopped, without fitting a huge battery. Most combat aircraft are started with a ground power unit, so the battery doesn't have to be very big. I'm guessing the electrical demands of an F-16 are quite large (fly-by-wire), even with load shedding, so a huge battery would be required to get the airplane to the ground from max altitude - or a reasonably powerful (heavy) gas turbine APU. So a one shot hydrazine based system is a reasonable (light weight) solution, although it has a maintenance overhead. Bear in mind the F-16 was designed as a lightweight fighter, so weight saving was probably quite high on the priority list.
Peter
On 15/07/2011 22:47, Robert L. Nuckolls, III wrote: [quote] Quote: |
What is really dead is the power source! |
The last few words of the pilot suggested something I'd
not heard before. He talked about a 'hydrazine' hazard
around his aircraft as he was talking with locals at
his airport of destination. There was also a reference
to an "EPU" . . . 'possible emergency power unit'.
Hydrazine and sulfuric acid combine in a manner that
provides spontaneous combustion with a very energetic
release of energy. In this case, I'm thinking that the
airplane was fitted with what could be a compact
and relatively light weight energy source that required
very little maintenance and has a long storage life.
(I've seen AQM-37 hydrazine powered targets successfully
flown after 20 years in storage).
It would be interesting to hear from folks with experience
inside the operating world of this style of aircraft
as to it's 'dead stick' options for power.
Bob . . . [b]
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lm4(at)juno.com Guest
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Posted: Sat Jul 16, 2011 6:21 am Post subject: It's nice when the center holds . . . |
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Carlos,I'll take a shot at that. Back in the days of yore airplanes were slower and if you lost your engine your control surfaces, on some airplanes, were sluggish at best. This made the stick somewhat unresponsive. So someone said "it's a dead stick" Just one of those things that stuck in our lexicon. Another such example was told to us, my Aeronautics ground school, by our instructor. He had worked for the first air mail service. He, and the rest of his team hosted a british aviator and as they were doing they're flying and lying the britisher mentioned the word altimeter. Well, up to that point we called the instrument an al-ta-meter. The british gentleman called it an al-tim-meter. The boys of the first air mail service thought that his way of saying it was more like the way it should be said. And it stuck, world wide. Things just happen that way.
Larry
On Jul 15, 2011, at 2:55 PM, Carlos Trigo wrote:
[quote] st1\:*{behavior:url(#default#ieooui) } <![endif]-->
Nice landing, and a very good demonstration of excellent pilot skills!
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
Carlos Trigo
[quote] --
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nuckolls.bob(at)aeroelect Guest
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Posted: Sat Jul 16, 2011 6:39 am Post subject: It's nice when the center holds . . . |
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At 04:46 AM 7/16/2011, you wrote:
Quote: | Bob,
I don't know F-16 systems, but have experience of other single seat military aircraft. I'm guessing the Hydrazine unit is a light weight method of mitigating the hazard of providing power once the (single) motor has stopped, without fitting a huge battery. Most combat aircraft are started with a ground power unit, so the battery doesn't have to be very big. I'm guessing the electrical demands of an F-16 are quite large (fly-by-wire), even with load shedding, so a huge battery would be required to get the airplane to the ground from max altitude - or a reasonably powerful (heavy) gas turbine APU. So a one shot hydrazine based system is a reasonable (light weight) solution, although it has a maintenance overhead. Bear in mind the F-16 was designed as a lightweight fighter, so weight saving was probably quite high on the priority list. |
That's about what I would have guessed.
Some years ago, there was some work described in
the development of tiny, combustion driven turbines
for hi-energy stand-by sources. One author even
hypothesized a lap-top computer running on butane.
Haven't heard/read anything along those lines since.
The GAR series IR guided missiles I used to work on
at Hughes-Tucson had a little bottle of nitrogen
held in liquid state at room temperatures . . . man,
that was a lot of pressure! A frangible diaphragm held
the liquid in check until launch. Then for the 90-second
or so service life of the missile, the liquid expanded
to run a small PM alternator that produced 150 watts
to power electronics. It was then routed to the back of
the IR optics to keep the lens cool at Lots-a-Mach. After
that, it pressurized an open loop hydraulic system that
operated flight controls at the trailing edges of the
guidance fins before being exhausted overboard. That
was in 1960.
Given the advances in really tiny gas turbines, it
seems certainly possible and perhaps practical to
craft a light weight power generation device with
considerable output and endurance while using up
much less volume and weight budget needed for batteries
of the same capability.
Some ideas take a very long time to evolve into
useful product . . .
Bob . . . [quote][b]
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peter(at)sportingaero.com Guest
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Posted: Sat Jul 16, 2011 2:02 pm Post subject: It's nice when the center holds . . . |
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But ... the F-16 is a 1980s design, and retro-fitting a gas turbine
generator would be a lot of work to fix what is essentially a
maintenance problem that everyone is already trained to deal with. If
you were designing an all electric airplane today I'm guessing it would
have some kind of turbine based generator to produce a few 10s of kW
that would kick in really quickly.
Peter
For example ...
http://www.lockheedmartin.com/news/press_releases/2005/UNIQUEINTEGRATEDSYSTEMSTARTSF35ENGI.html
Do not archive
On 16/07/2011 15:37, Robert L. Nuckolls, III wrote:
Quote: | Given the advances in really tiny gas turbines, it
seems certainly possible and perhaps practical to
craft a light weight power generation device with
considerable output and endurance while using up
much less volume and weight budget needed for batteries
of the same capability.
Some ideas take a very long time to evolve into
useful product . . .
|
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dave.saylor.aircrafters(a Guest
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Posted: Sat Jul 16, 2011 3:00 pm Post subject: It's nice when the center holds . . . |
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Reading about the starter-generator-APU brings up a question I've
wondered about many times: why don't piston engines don't have
starter-generators, or starter-alternators, or something like that?
The two devices are so similar it seems like merging the two is
obvious. Surely there must be some basic reason it wouldn't work.
Bob?
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Jul 16, 2011 at 2:58 PM, Peter Pengilly <peter(at)sportingaero.com> wrote:
Quote: |
<peter(at)sportingaero.com>
But ... the F-16 is a 1980s design, and retro-fitting a gas turbine
generator would be a lot of work to fix what is essentially a maintenance
problem that everyone is already trained to deal with. If you were designing
an all electric airplane today I'm guessing it would have some kind of
turbine based generator to produce a few 10s of kW that would kick in really
quickly.
Peter
For example ...
http://www.lockheedmartin.com/news/press_releases/2005/UNIQUEINTEGRATEDSYSTEMSTARTSF35ENGI.html
Do not archive
On 16/07/2011 15:37, Robert L. Nuckolls, III wrote:
>
> Given the advances in really tiny gas turbines, it
> Â seems certainly possible and perhaps practical to
> Â craft a light weight power generation device with
> Â considerable output and endurance while using up
> Â much less volume and weight budget needed for batteries
> Â of the same capability.
>
> Â Some ideas take a very long time to evolve into
> Â useful product . . .
|
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n8zg(at)mediacombb.net Guest
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Posted: Sat Jul 16, 2011 3:13 pm Post subject: It's nice when the center holds . . . |
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Gentlemen –
The Cliff Notes from a retired F-16-driver buddy:
There are many batteries on the F-16 but they are relatively small. Each of the axis of the flight control computer has a FLCS battery (3) and then there are others as well as the A/C battery. But, the EPU, not APU, is an emergency power unit powered by hydrazine that flows across an iridium catalyst to product energy. The hydrazine is pressurized with nitrogen I believe and flows from the tank across the catalyst. It then runs a small turbine (at a very high rpm) which in turn powers an aux hydraulic pump with also powers a small aux generator. It is good for a finite period of time (of which I do not recall) and basically dumps water vapor overboard.
neal
===========
Bob,
I don't know F-16 systems, but have experience of other single seat military aircraft. I'm guessing the Hydrazine unit is a light weight method of mitigating the hazard of providing power once the (single) motor has stopped, without fitting a huge battery. Most combat aircraft are started with a ground power unit, so the battery doesn't have to be very big. I'm guessing the electrical demands of an F-16 are quite large (fly-by-wire), even with load shedding, so a huge battery would be required to get the airplane to the ground from max altitude - or a reasonably powerful (heavy) gas turbine APU. So a one shot hydrazine based system is a reasonable (light weight) solution, although it has a maintenance overhead. Bear in mind the F-16 was designed as a lightweight fighter, so weight saving was probably quite high on the priority list.
That's about what I would have guessed.
Some years ago, there was some work described in
the development of tiny, combustion driven turbines
for hi-energy stand-by sources. One author even
hypothesized a lap-top computer running on butane.
Haven't heard/read anything along those lines since.
The GAR series IR guided missiles I used to work on
at Hughes-Tucson had a little bottle of nitrogen
held in liquid state at room temperatures . . . man,
that was a lot of pressure! A frangible diaphragm held
the liquid in check until launch. Then for the 90-second
or so service life of the missile, the liquid expanded
to run a small PM alternator that produced 150 watts
to power electronics. It was then routed to the back of
the IR optics to keep the lens cool at Lots-a-Mach. After
that, it pressurized an open loop hydraulic system that
operated flight controls at the trailing edges of the
guidance fins before being exhausted overboard. That
was in 1960.
Given the advances in really tiny gas turbines, it
seems certainly possible and perhaps practical to
craft a light weight power generation device with
considerable output and endurance while using up
much less volume and weight budget needed for batteries
of the same capability.
Some ideas take a very long time to evolve into
useful product . . .
Bob . . . Quote: | http://www.matronics.com/Navigator?AeroElectric-List | 01234567
[quote][b]
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Float Flyr
Joined: 19 Jul 2006 Posts: 2704 Location: Campbellton, Newfoundland
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Posted: Sun Jul 17, 2011 11:35 am Post subject: It's nice when the center holds . . . |
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Funny thing is the first time I heard the term, “Dead stick landing”, I knew exactly what it meant.
Noel
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of b d
Sent: July 15, 2011 6:57 PM
To: aeroelectric-list(at)matronics.com; Carlos Trigo
Subject: Re: It's nice when the center holds . . .
Quote: |
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
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Excellent observation . . . . the question is, shall we go back and change all the references using the "dead stick" phrase from all the books references and logs or shall we allow you to get over it and accept it. One vs. zillions
As I recall in a my old conversations with the Wright Bothers it originally meant "you are close to being dead if you don't use the stick to save your ass". I remember asking that very same question to Orville and Wilbur while sitting around their potbellied stove as if it was yesterday. They reiterated that "dead" had nothing to do with the engine but more about the pilot.
So if you were them, what phrase would you like to use if we were to correct the whole 100 plus years of aviation history and all log books to reflect your choice of phrases? "Alive stick"?
This reminds me of the prison story where the new guy comes in and hears "257" and everyone laughs, then "522" and everyone laughs. He questions what is going on and his cell mate says, "we have told these jokes so many times we just numbered them to save time". The new guy says "let me try one . . . 257!" but nobody laughed . . . then "522" and once again nobody laughed . . . he asked his cell mate "what gives?"
The cell mate said, "some people can tell a joke and some can't!"
You can stick with "Alive stick" and see how it works for you however removing the word "dead" from your thoughts may not be as healthy at that particular time. . . please let us know how it works for you. You could just yell out "dead" and forget the stick if that confuses you. That way the "dead" will give you some indication of what happens if you don't move the stick in the proper, timely sequence.
Don't take it personal, I'm just having fun with you . . . Where are you from?
Bruce
On Fri, Jul 15, 2011 at 11:55 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
Nice landing, and a very good demonstration of excellent pilot skills!
The only thing I don’t really understand is why you (native English speakers) call this situation a “Dead Stick” landing, when this is everything but a dead stick. On the contrary, this is a very “Alive stick” situation….
What is really dead is the power source!
Carlos Trigo
[quote] --
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