MacCready Speed-to-Fly: Glider & Paraglider Polar Calculator
Find training speed-to-fly and average cross-country speed from a three-point polar. Animate the MacCready tangent for gliders and paragliders.
Light aircraft and air mobility: density altitude, crosswind and takeoff distance, wind triangles and fuel, weight and balance, glide range, propeller thrust and eVTOL energy. Educational estimates; the aircraft flight manual and official data govern.
Find training speed-to-fly and average cross-country speed from a three-point polar. Animate the MacCready tangent for gliders and paragliders.
Estimate engine-out glide range with weight-corrected speed, wind and turn losses. Explore a north-up footprint and animated route. Aviation training only.
Calculate density altitude, runway wind components with gusts, and factored takeoff and landing margins. Explore generic performance effects with an animated 50 ft runway schematic.
Calculate takeoff, zero-fuel and landing weight and CG from your own POH data. Plot the CG envelope and follow the continuous fuel-burn track.
Convert CAS to TAS, solve wind correction and groundspeed for up to three legs, and budget alternate fuel and reserves. Includes an animated wind triangle. Aviation training only.
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