Vertical speed after takeoff question

Heyy… I can help

So the climb profile here says 250/280/78
The first number is your speed till 10,000 feet.
The second number tells you the speed from 10,000ft to 28,000ft. And then above 28,000ft is the last number which is in mach and not knots.

So, you’ll fly 250 knots till FL100, Then 280 knots till FL280, and after crossing FL280 till your cruise alt , you’ll be flying 0.78 mach.

For the descent, it goes the same.
Starting from the left, the left number says your speed at the top of descent, then till FL100 and the last one below FL100

So .78 mach while beginning descent, 280 till FL100 and 250 till landing which ofcourse you’ll adjust nearing the airport!

2 Likes

I tend to increase and decrease my speed gradually, so as I get faster, I increase my v/s to maintain a constant pitch, and vice-versa for descent, its really up to you with which one you do.

Be aware that the ToD and ToC in SimBrief FPLtoIF are only estimates and should not be considered as instructed nor recommended climb rates. I always recommend to take the corresponding waypoints off from the FPL. They are just more confusing than anything.

A few things to consider for the climb:

  1. Procedure restrictions / requirements (ATC, SID and related terrain);
  2. N1 percentage: that should be the baseline (I’d say anything between 85% and 98% should cover 99% of your climb needs depending on weather and weight)
  3. Your FPL will give you the climb speed (250/xxx/Mxx) this also helps setting a proper climb rate when combined with N1% (the first number is for speed below FL100, the 2nd is for up to FL280 and the last is until cruise)
  4. How fast you wish to climb, the comfort for your passengers, the requirements of your airlines in terms of fuel burn and how fast you wish to get your food tray served (a B777 for example can climb anywhere between 1,200 fpm to 4500 fpm). I usually start off around 2500-300 and slowly decrease to 1,000-1500fpm as I ascend and depending on my plane.

The below link may help as a reference. At the end of the day, you’re the pilot and you decide of how the plane should be flown :)

4 Likes

For a reference point, I tend to takeoff at the best I can and try to keep it natural and light. Then as I climb and gain speed, I also increase my V/S using autopilot if necessary in accordance to my speed. When my V/S reaches +3000 I try to keep it that way until cruise.

1 Like

keep it at 81% n1 (this rule can of course be broken if you are heavy, if the airport is high, or if it is hot, topic on this linked here Is it okay to do a full or high powered takeoff if the airport is hot, high, or you’re aircraft is heavy keep adjusting the vs to maintain the speed at 81% n1 if you start slowing down alot cruise at that altitude and burn off some feul and then continue up.

I’ll throw my two cents in. For airliners, I maintain a 15° nose up attitude until I am 1500 feet above GROUND level. At that point, I first start reducing the nose up attitude to about 9°-10° to begin accelerating, while simultaneously pulling the throttle back about 10%. During your climb at 10°, you should slowly begin retracting the flaps to gain airspeed, keeping in mind at all times what you’re current angle of attack is. It is harder to accelerate with an angle of attack of more than about 5°

1 Like

Pretty sure 81% N1 is too low for climb, even cruise is over that sometimes. Did you mean 81 throttle setting?

2 Likes

Are there posts about climb power for different aircraft anywhere? I’ve been using 87% N1 from that video everywhere but on some planes it’s just not enough near FL280.

1 Like

no I meant n1 it says to do that in the takeoff and climb tutorial.

The tutorial said 87 not 81 lol

1 Like

oh my bad then.

For efficiency I suggest a modest VS of 40000.

2 Likes

40000 feet a minute?

3 Likes

It can depend on weight. For airliners I wouldn’t go above 89% but it doesn’t matter too much in my opinion. depends how real you want to be. I think there is a step climbing tutorial that would definitely be beneficial. For turboprops I use max 90%N1 but climb speed is much slower. Dash 8 is 200kts and the TBM is about 160kts (at least that’s what I use)

[quote=“xsrvmy, post:17, topic:477301, full:true”]
Are there posts about climb power for different aircraft anywhere? I’ve been using 87% N1 from that video everywhere but on some planes it’s just not enough near FL280.
[/quote

https://community.infiniteflight.com/t/all-aircraft-takeoff-and-landing-profiles-my-new-topic-version-20-1-wiki/441564

This helps me a lot when I’m planning a flight. I hope this helps you too! Happy flying.

1 Like

That’s for takeoff power not climb power lol

Oh, now I see. Yeah I missed that little detail there, sorry. Ok, so I would just refer to your flight plan for the suggested VS once you’re climbing. Do you use simbrief to create your flight plans?

If so, it shows you what VS you should set during climb out. It also depends upon aircraft type, but more importantly – your weight.

Simbrief’s VS is absolutely useless lol… I use skyvector more often than simbrief these days

Yeah I’m not familiar with that flight planner. What I would do is after you have all your fuel, pax, and cargo loaded, check your total aircraft load percentage. That and the wind/weather conditions will give you the best indicator of what your climbing VS should be.

Hope you solve your issue, friend!

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.