GPS instead of turn and bank

Umm... OK.

So may I ask what was wrong with his other two paragraphs?

Dave



On Sun, 04 Feb 2007 19:09:26 -0500, Ron Natalie
wrote:

Mxsmanic wrote:

A GPS can only determine your track over the ground, which may not be
your heading.

This is the only thing that you said in your three whole stupid
ass paragraphs that was correct or the least bit relevent.

Unless you actually learn something about flying IFR in reality
rather than ****ing your life away in front of flight simulator
you'll never have an understanding of flight.

By the way, if you got your lard ass out of your chair and got
some excercise, you wouldn't overgross the training ships you
might be able to fly.

Dave wrote:
Umm... OK.

So may I ask what was wrong with his other two paragraphs?

They all repeat the same stupid irrelvent point.

In fact, the key of partial panel appraoch is simple.
If you aren't changing altitude and you aren't changing
heading (either by GPS or compass) then you are straight
and level. In fact, a GPS with a fast enough refresh rate
is as good (perhaps) better than a needle-ball gauge and
even your average portable is a whole lot better than the
whiskey compass.

Ron Natalie writes:

If you aren't changing altitude and you aren't changing
heading (either by GPS or compass) then you are straight
and level.

GPS doesn't know your heading. It only knows your ground track, which
isn't the same thing.

--
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On Feb 4, 9:38 pm, Mxsmanic wrote:
Ron Natalie writes:
If you aren't changing altitude and you aren't changing
heading (either by GPS or compass) then you are straight
and level.

GPS doesn't know your heading. It only knows your ground track, which
isn't the same thing.

--
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It doesn't matter. If your relative track doesn't change and you're
coordinated, then you're not banking.

Unless you're in a tornado.

Mxsmanic wrote:

Danny Deger writes:


I am thinking about buying a 1946 Taylorcraft that has NO gyros at all on
the panel. I really want at least a turn and bank so I want die if I loose
reference to the horizon for any reason. I have been told that the heading
information from a GPS is good enough to do the function of a turn and bank
and allow emergency operations without having a visual horizon reference.
Is this correct?


A GPS can only determine your track over the ground, which may not be
your heading.




True, but utterly irrelevant.





If there is no wind, both are the same, but if there is
any wind, your heading could be significantly different from your
ground track.


Completely and totally irrelevant.




GPS cannot determine your bank angle.


No need to.





In theory a GPS could determine
if you appear to be making a standard turn, if there is no wind.


The wind is irrelevant. Speed and rate of turn are all that is needed.


All the rest of the drivel snipped.

Mxsmanic wrote:

Ron Natalie writes:


If you aren't changing altitude and you aren't changing
heading (either by GPS or compass) then you are straight
and level.


GPS doesn't know your heading. It only knows your ground track, which
isn't the same thing.


And why do you even remotely care what your heading is?

"J. Severyn" wrote

Actually there are specialized GPS units that can determine attitude and
they have been around for at least 10-12 years. Google the "Trimble TANS
Vector" and you will see one of the earlier units.
http://trl.trimble.com/docushare/dsw...20997-00-C.pdf
They operate by using at least 3 antennae (usually four antennae) and
directly determine roll, pitch and yaw using carrier phase differences
from
the GPS satellites. Of course this is not the way the portable units
derive
the HSI info.

That's some cool stuff.

It seems as though I recall this subject coming up a few years ago in the
homebuilt group, and nobody came forward with a system like this one.

I didn't see a price associated with it anywhere.

Is this a case of, "if you have to ask, you can't afford it?" g
--
Jim in NC

Brad writes:

It doesn't matter. If your relative track doesn't change and you're
coordinated, then you're not banking.

A GPS unit doesn't know if you're coordinated. And if your track _is_
changing, it doesn't know why.

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Newps writes:

And why do you even remotely care what your heading is?

Sometimes you have to maintain a heading; sometimes you have to follow
a track.

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Newps writes:

True, but utterly irrelevant.

It's highly relevant. GPS can't be used as a bank indicator, nor can
it be used as a turn indicator. All it can do is measure changes in
your track, which it does by checking your position over the ground at
regular intervals. It doesn't know the attitude of the aircraft, and
it doesn't know if you are actually turning.

The wind is irrelevant. Speed and rate of turn are all that is needed.

A change in the wind will change your track as measured by the GPS.
The GPS does not know if this is a turn or just a wind change. And if
you turn, the GPS cannot distinguish that from a wind change, either.

--
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