Variable-Pitch Propeller: 2D Blade Element Diagrams

This simulator draws blade element theory the way it is actually derived: as flat 2D diagrams rather than a rendered blade. A rotating disk view shows the blade's angular position and its per-blade average angle of attack; a velocity-triangle panel builds the rotational speed U, axial airspeed V, and their resultant W at whichever radius you inspect, alongside the chord line, the angle of attack, and the resulting lift and drag directions; and a spanwise chart plots angle of attack, thrust distribution (dT/dr) and torque distribution (dQ/dr) across the whole blade at once. Adjust pitch, RPM, airspeed and blade count to see stall creep in from the root at coarse pitch and low speed, or negative angle of attack appear at the tip at fine pitch and high speed — exactly as on the real constant-speed propeller this pairs with.