Why The Hell... (random rant)

On 4/5/2007 10:08 AM Maxwell fell asleep at the keyboard, and awoke to
find this:

"Mxsmanic" wrote in message
...

[...] People who are stupid are likely to be
hostile.

Odd..you are clearly the poster child for stupidity, but you don't see
hostile.

Something you should know: Anthony claims to be a proponent and
practitioner of the so-called "Golden Rule," so he treats others as
he feels they should treat him.

So, when he attempts to label people as stupid (even if only by
implication), or treat others as if they're idiots, remember, he's
actually proposing that he be treated as if he's stupid too. At least
it's consistent.
--
dgs

On 4/4/2007 10:47 AM Mxsmanic fell asleep at the keyboard, and awoke to
find this:

I assumed that others would understand this, but I often get into trouble when
I assume others will understand things.

Is this another example of how you practice the Golden Rule?
--
dgs

In rec.aviation.piloting TheSmokingGnu wrote:
wrote:
An INS does not contain a gyrocompass.

I thought I read somewhere that certain INS do have a gyrocompass, for
setting the initial positional reference.

The compass (compii??? :P ) in question was erected much faster than a
ship-borne model by being held at magnetic north by a mag compass while
it spun up (so the calibration time was only that to correct for local
variation, and not to find the entire harmonic of the Earth).

In any case, it was useless when actually flying, and the system only
used the accelerometers thereafter.

Well, if you forced it to magnetic north on turn on, it would be
statistically faster than some random position, but still takes
a long time to settle; the Earth doesn't rotate that fast.

What a gyrocompass actually seeks is alignment of it's axis with the
axis of the Earth's rotation, so you would also have to throw in
a latitude initializer to do much good.

That's not saying no one ever tried to build such a thing, but the
laws of physics that make it work make it impractical for airplanes.

Plus, the initialization for INS has to set the position AND which
way is north.


--
Jim Pennino

Remove .spam.sux to reply.

dgs writes:

Is this another example of how you practice the Golden Rule?

Yes.

--
Transpose mxsmanic and gmail to reach me by e-mail.

writes:

A true enough statement, but one that shows how very little you know
about navigation.

When did truth become evidence of ignorance?

--
Transpose mxsmanic and gmail to reach me by e-mail.

writes:

You need to know the heading to use to get somewhere. You use the
compass to actually go that direction.

You don't know what that heading is unless you already know where you are.

You mean like fly a heading 230 degrees for 47 miles and there will be
a lake.

How do you know about the lake, with only a compass as your guide?

At the lake fly a heading of 273 degrees for 32 miles and
at that airport, fly a heading of 264 degrees for another 44 miles
and you will be at your destination?

How do you get this information from a compass?

You obviously know nothing of real world navigation.

No, it's just that I know about covert channels.

--
Transpose mxsmanic and gmail to reach me by e-mail.

writes:

Yeah, a few seconds once the decision is made.

No, far longer than that. I seem to recall it being minutes or hours,
probably the latter.

--
Transpose mxsmanic and gmail to reach me by e-mail.

writes:

And that tells you your course, not which direction the nose is pointed.

For navigation, your ground track is more important.

There is no GPS instrument available that will tell you which way
your nose is pointed.

As I've said, you just use two.

The only two places on Earth a magnetic compass doesn't work in an
airplane are over the north and south magnetic poles.

No. There are thousands of local magnetic anomalies that can make a compass
useless.

Piston engines have magnetos which generate the spark plug firing
voltage, and only the spark plug voltage.

Last time I checked, sparks counted as electricity.

--
Transpose mxsmanic and gmail to reach me by e-mail.

So what do you periodically use to align the DG to? Hint: it's not the true
magnetic north as see out of the window....


"Mxsmanic" wrote in message
...
writes:

Sorry, I have to mildly disagree as far as flying goes, that you'd
automatically be in "deep trouble". Many pilots use just the
compass / DG for cross-country flying.

A compass / DG is not just a compass.

You can't do much with just a compass alone. You need a clock, some
charts,
other things ... not _just_ a compass.

Therefore a simple compass
was "good enough" for winged flight across the Atlantic starting in
1919. which is not "four hundred years" ago.

They had more than a simple compass. In particular, they had accurate
clocks,
and charts.

--
Transpose mxsmanic and gmail to reach me by e-mail.

writes:

They are still big, heavy, and expensive.

Laser gyros are not big or heavy, although they are usually expensive.

I'll skip the rest of your post, as there are more anomalies than I care to
address.

--
Transpose mxsmanic and gmail to reach me by e-mail.