What should an ideal VS be for ascending? I usually keep it at 2800-3000 fpm for take off to cruise and around 1100 fpm for step climb. Is this accurate?
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Usually I do 2200/1800/600. Going 2800 to 300 is a bit unnecessary unless it’s like an a380
Hi, the limiting rule for ascent rate (the maximum) is: as fast you can climb for the engine power setting, and still be able to maintain required forward speed, or IAS.
The inability to maintain IAS at the desired level indicates your climb is too steep for your available power.
So you will adjust your climb according to weight, altitude and temperature conditions to be within the above rule.
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I saw in a YouTube video a toga take-off of an a320, I was surprised that it went up to 4000 Fpm just to keep the speed stable on take-off, and then they reduced power and kept it in 2000, although I don’t think it was heavy for that.
I found this on the forum a while ago and I still stick to it:
- Almost all commercial aircraft (especially nowadays) initially climb out at 2500-3000 v/s, during this time the speed tends to increase very slowly, that is why they reduce the rate of climb to around 1200 fpm or even less at the same thrust to increase speed up to desired speed 2-3 minutes after take-off and then continue their climb anywhere between 2500-2000 v/s
- Out of personal experience I recommend climbing at 2000 v/s out of 10000ft, 1800 v/s after 20000ft and 1200 v/s or 1000 v/s depending on the weight of the aircraft after 28000ft.
It works really well for me. As mentioned I adjust accordingly when I can’t maintain IAS.
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Thanks a lot guys, this helped! :)
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