14.5: Airspeed
It is often desirable to design an airplane for a specific speed, e.g. a speed
model.
Click the folder button 'Design Computation' and click into input field
'Airspeed [m/s]' to enter the desired value. The dimensional unit for entered
data is 'meter per second' [m/s]. Valid values are >0.
Near the input field are Up/Down-buttons
located. They can be used to change the airspeed with mouse clicks.
A click on the right mouse button pops up a menu to set the increment between 0.00001m/s
and 1m/s.
Below the input fields the button 'Start Computation' is located. If you click
this button, the Vortex-Lattice computation will start. An iteration
computation with several passes (approximate computation) starts. The program
changes stepwise the angle of attack to approximate the desired airspeed. If
the program exceeds 90° angle of attack, the computation will abort with an
error message.