What altitude, 7nm to run, on std. glideslope?
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Just a minor point, but to estimate the ALTITUDE you must add on the airfield elevation.
On QFE no need and should arrive on tarmac reading 0 feet, but if landing QNH then you might get a fright at Biggin Hill or Bristol where elevation is 600ft.
On QFE no need and should arrive on tarmac reading 0 feet, but if landing QNH then you might get a fright at Biggin Hill or Bristol where elevation is 600ft.
Check Attitude
Join Date: Nov 2001
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Turkish
Quite a complicated formula for RoD, and no allowance for wind.
Try the simpler one, RoD (Vertical Speed) = 5 x DME/GPS ground speed. i.e 120 kts Ground Speed x 5 = 600 fpm.
Old method
If you can't multiply, it gets easier, half the ground speed, add a zero, i.e. 120 kts GS, half is 60, add a zero = 600 fpm.
Newer method
Your method works too, but with mine,I also get time to pick my nose etc without losing the glideslope.
And yes, 300 ft / nm is correct, 7nm = 2,100 ft AGL for a sea level airport, or add 2,100 to strip elevation to get height AMSL for non sea level strips.
Gotta go, time to change hands.
Quite a complicated formula for RoD, and no allowance for wind.
Try the simpler one, RoD (Vertical Speed) = 5 x DME/GPS ground speed. i.e 120 kts Ground Speed x 5 = 600 fpm.
Old method
If you can't multiply, it gets easier, half the ground speed, add a zero, i.e. 120 kts GS, half is 60, add a zero = 600 fpm.
Newer method
Your method works too, but with mine,I also get time to pick my nose etc without losing the glideslope.
And yes, 300 ft / nm is correct, 7nm = 2,100 ft AGL for a sea level airport, or add 2,100 to strip elevation to get height AMSL for non sea level strips.
Gotta go, time to change hands.
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Height on G/S (ft)= Glideslope angle x Range (nm) x 101.3
= 3 deg x 7nm x 101.3 (fixed) = 2127 ft + Reference Datum Height (RDH) (usually 50 ft) = 2132 ft
Another R.O.D.
R.O.D. on GS (ft/min) = G/slope angle x Ground speed (kts) x 1.69
= 3 deg x 7nm x 101.3 (fixed) = 2127 ft + Reference Datum Height (RDH) (usually 50 ft) = 2132 ft
Another R.O.D.
R.O.D. on GS (ft/min) = G/slope angle x Ground speed (kts) x 1.69
Last edited by tom775257; 24th Nov 2003 at 01:36.
