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I present to you fine spaceplane enthusiasts... the Kerbal Wind Tunnel mod! We all build spaceplanes to fly faster and higher, but how do you know how fast or how high your current design can go? In the real world of aircraft design, engineers calculate the flight envelope for their aircraft before the first test flight rolls out. This mod runs your spaceplane through a virtual wind tunnel while still in the SPH and predicts its engine and flight performance at every speed and altitude. It also gives you a readout of various performance curves, plotting against angle of attack: ... and velocity: Try it out and start building even better spaceplanes today! You can even output the data to a CSV file to incorporate knowledge of the performance data into a KOS script or the like! Check out this Imgur album for more details on these images and more: https://imgur.com/a/D2i4Fge Download it from GitHub: https://github.com/DBooots/KerbalWindTunnel/releases Or SpaceDock: https://spacedock.info/mod/1927/Kerbal Wind Tunnel Source: https://github.com/DBooots/KerbalWindTunnel Released under the MIT License (with sub-components under their own license). P.S. This mod incorporates a pretty sweet graph-drawing library I made. If anyone's interested in super-simple graphing of data, hit me up.

All I wanted was to figure out how much excess thrust I had for my spaceplane along its ascent profile. And then I wanted to know the lift curve slope and level flight AoA so I could program my kOS spaceplane autopilot better. Next thing you know, I'm writing a mod to work in the Spaceplane hangar to calculate flight envelopes, alpha curves, and so much more. And it works, sort of totally! Check out the release thread here: https://forum.kerbalspaceprogram.com/index.php?/topic/177302-ksp-142-kerbal-wind-tunnel/ This shows that the Aeris 4A has a ceiling of about 22km and a max speed at sea level of about 790m/s and a max overall speed of about 1360m/s at around 14km using its air-breathing engines. Then, at 15km and at 964m/s its level-flight AoA is 2.8 degrees and it has 365kN of excess thrust. Great! But now I want to freshen up the GUI (thanks @TriggerAu, but this was clearly designed for Transfer Window Planner ) and add in Lift, Drag, and L/D curves for a given altitude and mach number. I also want to move to using background threads for calculating (right now, I either hang the program for 20 seconds while it calculates that graph or put up with artifacts from my non-thread-safe implementation on the BackgroundWorker, as you can see). First, some credits: Thanks to @linuxgurugamer and @Boris-Barboris. I learned a ton about the aerodynamics model from your Correct COL mod. Also your method of drawing line graphs is coming in handy for the lift curves I'm working on drawing. Thanks to @TriggerAu. I learned a ton about making the graph from your Transfer Window Planner. And thanks to the MechJeb team. I'm using a lot of your tricks to make things more thread-safe.