Specially modified wings accept very slow flight, where typical plane already stall. For example, typical stall speed for similar planes about 70kmh, but modif

Specially modified wings accept very slow flight, where typical plane already stall. For example, typical stall speed for similar planes about 70kmh, but modified for STOL could stay at air at 45-50. With some fortunate wind, could land vertically, and even flight backward (as seen from surface). Sure, need very reliable engine, because engine fail in such conditions could be fatal. Because of this nuance, small STOLs nearly only practice in US/EU (old US or German engines, or licensed clones).