Rationale behind vacuum instruments

Mxsmanic wrote in
:

Danny Deger writes:

One plus on reliability is a bleed air duct failure can distroy a
plane in a few minutes. The air is REALLY hot. We lost an F-4 in
the squadron I was in due to a bleed air duct failure.

True, although I don't recall ever reading about a bleed duct failure
in a commercial airliner. I think it's very rare.


Not too rare, and it wouldn't lead to any real damage unless you were
very unlucky.. Anyhow, bleed is not used to powere gyros!



bertie

"Danny Deger" wrote in
:


"Mxsmanic" wrote in message
...
Danny Deger writes:

One plus on reliability is a bleed air duct failure can distroy a
plane in a
few minutes. The air is REALLY hot. We lost an F-4 in the squadron
I was
in due to a bleed air duct failure.

True, although I don't recall ever reading about a bleed duct failure
in a commercial airliner. I think it's very rare.

I can't think of one either, and I have followed airline accidents
fairly close for many years.


that's because they don't usually cause accidents..


bertie

Mxsmanic,

Why not use manifold vacuum as the primary source, instead of a separate
vacuum pump that provides an additional point of failure?

Because Manifold Pressure sucks (and that is a serious and true answer).

The manifold vacuum
would be there as long as the engine were running, without the need to rely on
a pump.

Wrongo!

--
Thomas Borchert (EDDH)

In rec.aviation.piloting Thomas Borchert wrote:
Mxsmanic,

Why not use manifold vacuum as the primary source, instead of a separate
vacuum pump that provides an additional point of failure?

Because Manifold Pressure sucks (and that is a serious and true answer).

The manifold vacuum
would be there as long as the engine were running, without the need to rely on
a pump.

Wrongo!

This was written by someone obviously too young to have ever driven a
car with manifold vacuum powered windshield wipers and little to no
understanding of real engines.

--
Jim Pennino

Remove .spam.sux to reply.

In rec.aviation.piloting Thomas Borchert wrote:
This was written by someone obviously too young to have ever driven a
car with manifold vacuum powered windshield wipers and little to no
understanding of real engines.


This was written by someone running his AIRCRAFT engine at full
throttle at the altitudes used by many of us. A throttle setting that
will yield no usable manifold "pressure". A car is operated
differently.

I was talking about the other guy, not you.

If you too are too young to have had the experience, vacuum windshield
wipers did something different everytime you changed throttle setting;
sometimes they stopped totally, sometimes they went like hell.

--
Jim Pennino

Remove .spam.sux to reply.

On Apr 12, 4:25 pm, wrote:
In rec.aviation.piloting Thomas Borchert wrote:

This was written by someone obviously too young to have ever driven a
car with manifold vacuum powered windshield wipers and little to no
understanding of real engines.

This was written by someone running his AIRCRAFT engine at full
throttle at the altitudes used by many of us. A throttle setting that
will yield no usable manifold "pressure". A car is operated
differently.

I was talking about the other guy, not you.

If you too are too young to have had the experience, vacuum windshield
wipers did something different everytime you changed throttle setting;
sometimes they stopped totally, sometimes they went like hell.

My 1951 International pickup has the vacuum wipers. The young folks
think they're hilarious. Stomp on the gas, they quit. Let up, they go
like mad. Actually something of a pain, and I'm thinking of adapting
an electric wiper motor to it.

Dan

Robert M Gary wrote bs, bs, bs
Roy Epperson wrote bs, bs, bs
Deanwil wrote bs, bs, bs

What does it take for you people to understand that we are all sick and
tired of your pathetic attempts at humour/sarcasm/whatever you think it
is.
We are sick and tired of it.
Can you understand that?
You are not funny!

can we please please please have a respite from this crap?

Thank you

Tony
--

Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE