Aircraft Climb Performances Factors

Aircraft Climb Performances Factors


How is the Vx and Vy speed calculated?


As we could observe in aviation power curves post, there are some points where the Pa=Pr corresponds to a null Rate of climb. That is why the rate of climb curve has a shape of a hill. The top corresponds to the maximum Rate of climb.

The way to calculate the Vx and Vy is the result of drawing the R/c curve related to its speed. The top of the curve is VY and the tangent from the origin to R/c curve is Vx.






Weight: The heavier the plane is, the less angle and rate of climb it has. In the post climb aircraft performances we can see that in each of the formulas the weight is dividing. So the new Rate of climb curve is smaller.

If we draw the graphic of the rate of climb curve related to its speed, we notice that Vx and Vy increases. Another way to see that is:  if the weight increases we required more lift,and for getting more lift the speed must increase.



Flap Setting: the higher flap setting, the less rate and angle of climb, due to the power required increases. On the other hand with higher wing surface the speed we need to get the same amount of lift decreases that´s why the rate of climb curve related to its speed moves to the left, resulting in an Vy and Vx decreases.


Altitude: As we know the higher we fly, the higher density altitude we have. That leads on an increase of power required, decrease of power available, and increase of True Air Speed (TAS, this concept we will see it in a principles of flight post). That´s why the rate of climb related to its speed curve moves lo the right, and Vx and Vy increases.



Load Factor: The load factor is also known as a G force. When we make a turn our weight increases due to the G force, so the effect is similar to the increase of weight shown above.  

Wind: The wind does not have any effect on the power curves, so the Angle and Rate of climb should be the same. But unfortunately this statement is only true with the rate of climb.

If the Angle of climb is the path between ground and the trajectory of the plane.  As the rate of climb does not change and the Ground speed changes. That leads on a change of the angle of climb (see the picture bellow).






All planes have a maximun altitude they can climb, that altitude it is the Cealing of an aircraft. 


Absolute Ceiling: ocurrs when we do not have this excess of power . So Vx=Vy





Service Ceiling : Altitude where the aircraft can mantain a rate of climb of 100 feet/min.

Cruise Ceiling: Altitud where the aircraft can mantain a rate of climb of 300 feet/min




  • Cannabis Business Management | Oct 23,2017

    This design is incredible! You definitely know how to keep a reader amused.
    Between your wit and your videos, I was almost moved to
    start my own blog (well, almost…HaHa!) Great job.

    I really enjoyed what you had to say, and
    more than that, how you presented it. Too cool!

  • find more info | Mar 22,2018

    This is my first time go to see at here and i am in fact impressed to
    read all at one place.

  • click site | Apr 3,2018

    If you are going for most excellent contents like
    myself, only pay a visit this site all the time for the reason that
    it offers quality contents, thanks

  • minecraft | Sep 4,2018

    You should be a part of a contest for one of the best
    blogs online. I’m going to highly recommend this web

    • Hulk1984 | Sep 7,2018

      thank you very much!!

  • minecraft | Sep 4,2018

    Thanks very nice blog!

    • Hulk1984 | Sep 7,2018

      thanks for reading it

  • minecraft | Sep 4,2018

    My brother recommended I might like this blog. He used to be totally right.
    This submit actually made my day. You can not consider just how a lot time
    I had spent for this information! Thanks!

  • minecraft | Sep 4,2018

    This post is worth everyone’s attention. Where can I find out more?

  • minecraft | Sep 4,2018

    Way cool! Some very valid points! I appreciate you penning this
    write-up plus the rest of the site is very good.

  • minecraft | Sep 5,2018

    I’m truly enjoying the design and layout of your blog.
    It’s a very easy on the eyes which makes it much more enjoyable for me
    to come here and visit more often. Did you hire
    out a designer to create your theme? Superb work!

  • minecraft | Sep 15,2018

    Keep on working, great job!

  • minecraft | Sep 22,2018

    Hmm it seems like your website ate my first comment (it was super long) so I guess I’ll just
    sum it up what I submitted and say, I’m thoroughly enjoying your blog.
    I as well am an aspiring blog writer but I’m still new to the whole thing.
    Do you have any helpful hints for novice blog
    writers? I’d really appreciate it.

  • minecraft | Sep 24,2018

    At this moment I am ready to do my breakfast, later than having my breakfast coming again to
    read further news.

  • minecraft | Sep 30,2018

    This post is in fact a pleasant one it helps new net viewers,
    who are wishing for blogging.

  • Google | Nov 3,2018


    We came across a cool internet site that you simply might take pleasure in. Take a appear in the event you want.

  • Leave a Comment

    Your email address will not be published. Required fields are marked *




    This site uses Akismet to reduce spam. Learn how your comment data is processed.