"Montblack" wrote in
:

("M" wrote)
(Simple and quick approximate calcuation method: 2.5mi = 15000 feet.
The 3 degree ILS is approximately 1:20 approach ratio. So 15000 / 20 =
750 ft).

My quick method:
5200 + 5200 = 10,400 + 2,600 = 13,000

13,000 ft = 2.5 miles
1,300 ft = 10%
130 = 1%
390-400 ft = 3%

%%%. Oops...

NOT 3 degrees!! My mistake.


Montblack


Are you using statute miles? A NM is slightly over 6,000'.

Why not use the simple 3:1 rule-of-thumb? For every 3 NM traversed, you
will descend 1,000' on a 3 degree glide slope.

--
Marty Shapiro
Silicon Rallye Inc.

(remove SPAMNOT to email me)