The following are a few questions that i have come across while writing takeoff distance code: 1. Assuming a known static thrust, how will this thrust vary as the airspeed increases? ex. Is the relationship linear? quadratic? how can i determine the coefficients of the "thrust in terms of velocity equation"? 2. Assuming i know my engine power output at given rpm, and given some known prop parametrs. What program/website contains the equations needed to find the static thrust output? 3. Does anyone know of some good Take Off Distance Calculators that i can use as a sanity check for my code?