.The rate varies a lot when you make idle descents. But, for 3 deg slope, If you want to calculate if you are making 3 deg or not, try this, using GS: 300 kt aprox 1700 fpm 250 kt aprox 1500 fpm 200 kt aprox 1000 fpm 300kt. 1500fpm 250kt. 1250fpm 200kt. 1000fpm |
wrong
3º is not 5% we use 5% for the glideslope, though, because it is much simpler and is always approximate, and glideslopes are not always exactly 3º. For a descent from thousands of feet, there is a difference between a 5% and a 5.24% |
ok fair enough, so if you like maths, lets have a close look:
200kt*tan3°=A(rate of descent in NM/h) A/60*1852/0,3048=1061ft/min 300kt=>1592ft/min 250kt=>1326ft/min so if you like rocket science you use that, personnally i divide GS by 2 300kt=>1500ft/min 250kt=>1250ft/min 200kt=>1000ft/min simple and useful rule of thumb, but anyway you and me are not so far from the truth like a 3° path is exactly 318ft/nm 300 ft for me 330ft for you Do you use mach number * 3= V/S for 3° path without too much wind and high mach number mach number ruffely *10= nm/ min |
Do you do this when you're hand flying?
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actually yes, it comes in my scan to check GS and my V/S, i found it really easy to check, don t you?
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i found it really easy to check, don t you? BTW do you really live near/in Toulouse? - 'cos if you do we're probably neighbours. |
Toulouse, is homebase. I agree with out with KISS, the tan function is useless is just to proove that a simple rule iof thumb is good enough
so you fly military A/C |
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