What altitude, 7nm to run, on std. glideslope?
 

Sorry, ain't got a protractor handy and can't remember my trig!

300 feet per mile -- 2100' above the runway.

If you need more accuracy its 320'/nm (318.64) so it would be closer to 2240 ft. (2230.48)

so nicely within the range of a SA-7 /14 :*

Glideslope in Degrees X Speed in KTS X 100
__________________________________ = R.O.D

60

one three is three..

two threes are six..

three threes... oh god have you got a calculator

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.

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.

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