The altimeter is one of the primary flight instruments and is used to measure vertical height. This post covers operating principles and altimeter design.
The airspeed indicator (ASI) is an instrument that makes use of the aircraft’s pitot-static system to provide the pilot with a reading of the aircraft's speed.
The Wing Plotting Tool allows you to sketch a wing planform by defining a combination of Wing Area, Wing Span, Aspect Ratio, Taper Ratio, Chord and Sweep.