🛫 Takeoff speedsi
V1, VR and V2 for your runway, weight and weather, plus trim, a flex temperature and the heaviest weight this runway allows.
Airport and runwayi
Weatheri
Aircraft and loadingi
Aircraft data and trim reference i
Change these to match your aircraft. The 737-800 trim values are rough defaults; replace them with two points from your aircraft's trim table.
Match my sim i
Use the same weight and flaps as in your sim.
How this is calculatedi
Stall speedFrom weight, wing area and the lift coefficient of your takeoff flaps.
V2 and VRV2 is 1.13 times stall speed, never below 1.1 times Vmc. VR sits about 6 kt below V2.
V1Found by searching for the speed where stopping and continuing need the same runway (balanced field), within the runway you have.
Wind and thrustHalf of a headwind and 1.5 times a tailwind are counted. Thrust falls with heat, altitude and speed.
FlexThe highest assumed temperature that still fits the runway, with at most a 25% thrust reduction.
TrimA straight line between the two CG and trim points in the aircraft data.