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 Post subject: Climb And Descent Rates
PostPosted: Mon Oct 02, 2017 10:28 am 
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Joined: Mon Sep 28, 2015 11:33 am
Posts: 56
Hello everyone,

I have a question concerning the climb and descent rates in the aircraft profiles. Climb rates are easy to find, but not so descent rates. How do you guys do it? Do you have a database? Or is there a rule of thumb, like descent rate = climb rate x 1,5 for props?

Cheers,

Dimi


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PostPosted: Tue Oct 03, 2017 8:00 pm 
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Joined: Tue Dec 24, 2013 1:27 pm
Posts: 850
Quote:
I have a question concerning the climb and descent rates in the aircraft profiles. Climb rates are easy to find, but not so descent rates. How do you guys do it? Do you have a database? Or is there a rule of thumb, like descent rate = climb rate x 1,5 for props?
I don't recommend using the maximum climb rates from the aircraft manuals.
http://webapp1.dlib.indiana.edu/virtual ... A01001.HTM has a list of climb and descent rates for many aircraft types, but often I configure lower rates than listed here.

Some examples I use:
For GA 1-2 engine non-turbo props (C162/C172/C182/C337) I usually use 800/800fpm
For turboprops something between 1000 and 2000, but more varied than the non-turbos (C441: 2000/1500; PA23F: 1000/1500; C310R: 1000/1000); Dash8-Q400: 1500/1000; MU-2B: 1500/1500)
For older propliners (B377/L049) even 500/500.

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PostPosted: Wed Oct 04, 2017 9:08 am 
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Joined: Wed May 27, 2009 8:41 pm
Posts: 955
Location: LIMZ
Quote:
Quote:
I have a question concerning the climb and descent rates in the aircraft profiles. Climb rates are easy to find, but not so descent rates. How do you guys do it? Do you have a database? Or is there a rule of thumb, like descent rate = climb rate x 1,5 for props?
I don't recommend using the maximum climb rates from the aircraft manuals.
http://webapp1.dlib.indiana.edu/virtual ... A01001.HTM has a list of climb and descent rates for many aircraft types, but often I configure lower rates than listed here.

Some examples I use:
For GA 1-2 engine non-turbo props (C162/C172/C182/C337) I usually use 800/800fpm
For turboprops something between 1000 and 2000, but more varied than the non-turbos (C441: 2000/1500; PA23F: 1000/1500; C310R: 1000/1000); Dash8-Q400: 1500/1000; MU-2B: 1500/1500)
For older propliners (B377/L049) even 500/500.
As Thomas said you shouldn't put max climb rates into PF3. To give an example a Super VC10 with a max take-off weight of 335,000lbs can easily achieve an initial climb rate of 6,000fpm. What you should enter is in effect the maximum operational rates of climb and descent. This allows for some flexibility in your actual rates achieved. Thomas's figures are about right for the a/c he has listed. For jet transports I use a climb rate of 2,000fpm and a descent rate of 2,500fpm. This allows me to have either a low rate of initial climb/descent or a high one depending on the circumstances of the particular route and fpl. An example would be flying into Turin from the NW. You have to cross The Alps and immediately there is the airport. So it always requires speed brakes and a relatively low airspeed to get down in time. The STARs also provide for a rapid descent at this airport.

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PostPosted: Fri Oct 06, 2017 12:42 pm 
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Joined: Mon Sep 28, 2015 11:33 am
Posts: 56
Thanks guys!


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