Jump to content
  • 0

Airplane flight characteristics



3 answers to this question

Recommended Posts

  • 0

Moving to Gameplay Questions.

5 hours ago, MAFman said:

How do you determine what the stall speed of a plane is? Is there a way to do that other than experimentally?

Basically you just need to try it and see, as far as I know.

For one thing, "stall speed" depends on a lot of factors, including not just the plane design, but also how the various control surfaces are set, how you're piloting it, etc. (And that's before even considering varying atmospheric density depending on elevation and so forth.)

Link to comment
Share on other sites

  • 0

Experiment is certainly the easiest way with KSP.

KSP wings have a very soft stall, with their max lift at 30° AoA and falling slowly after that.   You might not even notice the stall in KSP.

If you are still building airplanes for Duna, I guess you might want to know that KSP does have the force of lift vary according to  ½ CL S ρ v²,
where CL is the coefficient of lift, S is the conventional symbol for total area of the wings, and for density of air (1.1 kg/m³ at Kerbin's sea level)

So to fly nearly level for landing,  Mass × g =  Lift  = ½ CL S ρ v², 
On Duna g is only 0.3 as strong as on Kerbin. And ρ is 0.1 times as dense, even thinner over the higher mountains.  So you would need 3× the wing area for Duna as you need for Kerbin, or you land √3 times faster, but Duna is rough so you want the wing area.

( KSP makes two exceptions to the usual   Lift  = ½ CL S ρ v².  The game reports "relative wing area," where 'relative wing area' = 1 looks like 4 m².  The coefficient CL would normally be nearly constant for speeds below the speed of sound, but KSP makes the maximum CL quite large, about 8 based experiment, at low speeds, reducing it to 4 at 100 m/s and to the more realistic 1 at the speed of sound -- one more reason to use lots of wing to get landing speed well below 100 m/s. )

Edited by OHara
Link to comment
Share on other sites

This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...