Calculating VDP

[mamba20]

Anyone know the methods?

 

[peter185]

Take the MDA and divide by 3 for a 3 degree glidepath.

For example, the MDA is 500 ft AGL. 500/3 = 1.66 miles. Drop the zero's accordingly to get a number that makes sense.

 

[regionalcap]

HAT divided by 300

 

[CA1900]

Anyone know the methods?

http://www.google.com/search?q=calculate+VDP


Not to be harsh, but honestly, make some effort...

 

[AnimalTale]

Here are a couple easy ways, bro.

Example: (486) feet above ground

1)Timing method==> 486 /10 = 48.6 sec

2)DME==> 486==4.8 x 3= 1.5 miles from RWY END

CYA

 

[Jonny Sacko]

This is the easiest question EVER!. You set in the required altitude, Lower, OR Higher, into the Alt. selector. This is where the fun begins. You must have patience. Close your eyes and count out loud to 3 (not fast, just normal pace). Open your eyes, and look on the screen for a little rounded line (like a quarter of a circle, kind of looks like a "smile" or a "frown") in green or yellow, or whatever color shows up. If this "smile" is before your point requiring that altitude, you can smile my friend. You've done it!

Sorry too much starbucks this morning.

 

[SNOWBUM]

who cares? fly an FMS airplane with vnav capabilities, so you shoot rnav, gps , vor or ILS , all of wich have vertical guidance.

 

[ekuflyer]

Take the MDA and divide by 3 for a 3 degree glidepath.

For example, the MDA is 500 ft AGL. 500/3 = 1.66 miles. Drop the zero's accordingly to get a number that makes sense.

Gus wears a hat.
Are you a "Maineiac" maybe A.B.

 

[WSurf]

Anyone know the methods?

Someone must have a interview coming up!!!

 

[se1776]

let the captain deal with that

you just fly the airplane you don't have time for math

 

[Bernoulli]

Calculating VDP was the original question...not calculating PDP (planned Descent point). If there is a VDP you will not need to calculate anything...it's published on the profile view of the non precision approach with a V symbol. There will be a DME amount beside the V so you will know when to descend. As far as what rate to descend, 95% of the time the VDP will coincide with a PAPI or VASI..so for 95% of the time nothing to calculate. For the other 5% of the time when there is not a visual glide path simply take half your ground speed and add a zero to detemine your vertical descent speed. (120 knots GS... 1/2 of 120 = 60...add a zero to 60 to get 600 feet per minute on your VSI). The previous answers were all correct for PDP which is the point on an approach where a pilot must begin the descent to the runway... but that point is not published like a VDP.
Hope that helps.

 

[SEVEN]

What's a VDP?

 

[Amish RakeFight]

It's actually a PDP not a VDP

DISTANCE:

HAT / 300 = VDP (miles)

ex. HAT = 600'/300 = 2 miles.
VDP is 2 miles prior to MAP




TIME:
10% of HAT = VDP (time)

ex. HAT = 600' x .10 = 60 seconds.
VDP is 60 seconds less than the published time for category.

 

[Tejas-Jet]

I don't do non-precision approaches

 

[Uniform Shop]

who cares? fly an FMS airplane with vnav capabilities, so you shoot rnav, gps , vor or ILS , all of wich have vertical guidance.

Unless of course the MAP is at the VOR which is a mile from the threshold and there is no Gradient Path. Then it's back to V/S and a VDP. :beer:

 

[crashpad]

If You Can See It, You Can Make It!

 

[JDriver]

Gs
------ = Vdp
Hat

 

[Oakum_Boy]

Canpa.

 

[freightdogfred]

1.3 miles from the end of the runway, works fer just about all of them.

Try it you'll see.

 

[regionalcap]

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