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RATE OF DESCENT INDICATOR ON VIRTUAL ILS DISPLAY


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Biggles-EGKB
Biggles-EGKB
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The one calculation which I constantly find myself doing during the last 6 miles when establish on the ILS is "What should my rate of descent (RoD) be?"

Now I know that the glideslope gives that to me as a visual "..too high, too low, just right...." but somehow I always like to have secondary confirmation of these things especially when all I can see is wall to wall clouds outside the cockpit and I know that the ground is coming up to meet me in the not too distant future!

To have an indication of what the necessary RoD should be in order to land on the numbers and to correlate that to the aircraft's VSI would be a very comforting addition to SD's armory.

At the moment, I'm doing it in my head on the decent at a time when the workload is at its heaviest. Some how I really think that, since SD is doing this calculation constantly in the background; advises me at the start of the virtual ILS approach of the required RoD; a simple display inside the virtual ILS instrument followed by a quick flick of the eyes to the cockpit VSI would do the job in a matter of seconds.

So what do you think for all of us (V)FR fliers?




Biggles -- EGKB
Edited 8/11/2012 10:42:49 PM by Biggles-EGKB
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Runways
Runways
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Please note page 1 where the speedx5 rule idiosyncracies were referred to on the 21.8.2012 by Biggles-EGKB. Approximate deductions,lets face it, are not as accurate as a GPS derived constantly updated instantly displayed values.

Very Newbytheway

DurhamTeaseAirport
Edited 9/4/2012 7:16:49 AM by Runways
Biggles-EGKB
Biggles-EGKB
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Thanks runways. Point well made.

It's all about accurate information rather than "guesstimate" through a rule of thumb. The rule of thumb only works if you're in the right place in a 3D environment.

In my experience life isn't like that, and flying certainly isn't!!!

Also you're asking to multiple 5 (GUESTIMATE 1) by a piece of information that the normal cockpit doesn't have namely GROUNDSPEED. So shall we have another "guesstimate" of that (GUESTIMATE 2).

I've always wondered what "GUESTIMATE 1" x "GUESTIMATE 2" gives you. Neither my Pooleys nor my calculator can work it out. Perhaps its another mown hedge at the upwind end of the runway!!



Biggles -- EGKB
Edited 9/3/2012 7:28:55 PM by Biggles-EGKB
Runways
Runways
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Yes.
Also the pilots culture encourages them to aspire to be more precise each time so as to, hopefully, increase the margin of safety. That is although we tend to get away with it most of the time!

Very Newbytheway

DurhamTeaseAirport
Edited 9/4/2012 7:27:35 AM by Runways
ckurz7000
ckurz7000
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Just for the sake of reference:

The exact formula for a 3° descent rate is:

GS(kts) x 5.3 = rate of descent (fpm).

If you use the value of 5 instead of 5.3 you will get a 2.8 degree approach angle.

Greetings, -- Chris.
Runways
Runways
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Absolutely, and Near enough, in the ideal world & thanks for the formula.
Having said that,during the landing phase while considering:

1. Where to get the GS from in a normal cockpit?
2. If flying in the good old British weather is equal to flying in the ideal world or THE Standard Atmosphere?
3. Other variables thrown in by mother nature.
4. Doing SIMPLE mental arithmetic in a single pilot operation.
5. Taking care of the rest of the landing requirements.
6. Being absolutely ready for any emergency that might arise.

I personally would no doubt arrive to the same conclusion arrived at by Biggles-EGKB @ 18.15, 3rd September yesterday, & prefer to SIMPLY have the maths readily calculated, constantly updated and clearly displayed (No hide & seek here please !). Come to think of it, wouldn't anyone?

Very Newbytheway

DurhamTeaseAirport
Edited 9/4/2012 3:21:19 PM by Runways
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Biggles-EGKB - 8/9/2012 6:22:20 PM
Tim Dawson - 8/20/2012 3:11:47 PM
Biggles-EGKB - 8/20/2012 6:05:26 PM
adhawkins - 8/21/2012 12:44:24 PM
                     Biggles-EGKB, iPlease permit me to iAgree with you once more....
Runways - 8/21/2012 9:04:27 PM
Biggles-EGKB - 8/21/2012 10:33:31 PM
adhawkins - 8/22/2012 12:21:46 PM
Biggles-EGKB - 8/22/2012 2:41:05 PM
Runways - 8/22/2012 4:33:02 PM
sprucegoose - 8/31/2012 11:47:23 PM
                         On my iPAD3 the GS is always 1/2 scale deflection down when on the...
Runways - 9/1/2012 7:26:14 PM
                             Amen, Biggles. The brilliant thing about all this is that all this...
Runways - 9/2/2012 5:11:50 PM
Biggles-EGKB - 9/1/2012 11:02:04 PM
stevelup - 9/3/2012 8:04:19 AM
Runways - 9/3/2012 12:23:02 PM
jerseyscampi - 9/3/2012 4:56:16 PM
Runways - 9/3/2012 6:41:55 PM
Biggles-EGKB - 9/3/2012 6:51:00 PM
Runways - 9/4/2012 7:25:42 AM
                         Just for the sake of reference: The exact formula for a 3° descent...
ckurz7000 - 9/4/2012 8:27:17 AM
                             Absolutely, and Near enough, in the ideal world & thanks for the...
Runways - 9/4/2012 10:56:30 AM
Biggles-EGKB - 9/4/2012 5:56:29 PM
Runways - 9/6/2012 9:33:20 AM
Runways - 9/13/2012 5:07:21 PM

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