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Vertical card replacement for small directional gyro?

ryoder
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47U Mentor

47U

Posted
Posted

"Now my biggest gripe is why they are a degree off from each other?"

The horrors... I was on a SWA flight recently and following the flight on the onboard internet tracker... I was surprised to see the heading is calculated to the third decimal place. That right there is precision!

Are both Aspens running the same software version? Do they use the same remote compass/flux valve? Is the wiring from the remote compass shielded? Or is the heading actually GPS driven?

If you figure it out please post the reason why. Being currently unemployed, this question is the highlight of my day.

Marauder Grand Master

Marauder

Posted
Posted

"Now my biggest gripe is why they are a degree off from each other?"

The horrors... I was on a SWA flight recently and following the flight on the onboard internet tracker... I was surprised to see the heading is calculated to the third decimal place. That right there is precision!

Are both Aspens running the same software version? Do they use the same remote compass/flux valve? Is the wiring from the remote compass shielded? Or is the heading actually GPS driven?

If you figure it out please post the reason why. Being currently unemployed, this question is the highlight of my day.

The Aspens have completely separate AHRS and remote compass hardware. I usually will see a degree or two difference between them. So much better than my old DG and wet compass days.

I do a compass ramp check when I taxi out from my hangar and there is a known 150 degree heading that is lined up with the taxiway line. I line up on it and read the three sources (two Aspens and the vertical card compass). I also read the runway heading as a double check. So much nicer only seeing a couple degree difference.

As for the wiring, there is a shielded cable that run from each Aspen. There is also heading information provided by the GPS, but this is used to determine a few parameters like winds aloft and the important wind correction.

A good example is this picture. The heading is 358 degrees which is being flown to maintain the 004 degree course. The winds aloft are at 301 at 14 knots. The blue arrow shows the Aspen ground course marker that shows your course across the ground (it is on the end of the CDI arrow). Amazing to see how far technology has come!

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N201MKTurbo Grand Master

N201MKTurbo

Posted
Posted

How did this thread about ancient DGs get hijacked to an Aspen thread?

 

FWIW in my old M20F it had the old DG removed and replaced with a modern DG by the previous owner. All he did was enlarge the hole, hook up the vacuum and filter hoses and enlarge the hole in the plastic overlay. It didn't look bad.

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Marauder Grand Master

Marauder

Posted
Posted

How did this thread about ancient DGs get hijacked to an Aspen thread?

FWIW in my old M20F it had the old DG removed and replaced with a modern DG by the previous owner. All he did was enlarge the hole, hook up the vacuum and filter hoses and enlarge the hole in the plastic overlay. It didn't look bad.

Hmmm... Probably because old compasses are BORING! ;)

ryoder Veteran

ryoder

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I am squawking 7500 on this thread :)

Aspen actually fits in nicely with this thread because I was considering not spending a dime on the old steam gauges and going with the vfr aspen or a g500. I will probably have one thousand bucks into a new gyro that could go into glass instead.

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carusoam Grand Master

carusoam

Posted
Posted

My favorite displays are analog...

But they are digital instruments under the needles, same with the radios...

The 90’s were unique.

Back to the point...

Get an accurate display of your data.

The precision of three numbers past the decimal is not as important.

Rate of change is a piece of information that is good to discern...

Newer instruments handle rate of change information better than the WWII era stuff.

If you like engineering detail while you fly, save money while you select your Aspen.

If you like to pay extra to have to think less, save more money while you select your Garmin.

I really like the wind direction and speed data IN the cockpit. I have seen the results of somebody landing with the wind....

There probably are a couple of hard to explain skid marks at the end of your runway???

The WWII era windsock can be difficult to find, see, and interpret...

If you can't discern if the sock is pointing towards you or pointing away.... Go around!

I tried to come back on track...

-a-

scottfromiowa Grand Master

scottfromiowa

Posted
Posted

I am squawking 7500 on this thread :)

Aspen actually fits in nicely with this thread because I was considering not spending a dime on the old steam gauges and going with the vfr aspen or a g500. I will probably have one thousand bucks into a new gyro that could go into glass instead.

That's 1AMU newb...Welocme to the Cheap-Bastard's club...

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