RC Aircraft Thrust Calculator

For a trainer or slow flyer: 0.5 to 0.7:1 (thrust equals 50 to 70% of weight). For sport flying: 0.9 to 1.2:1. For aerobatics: 1.2 to 1.5:1. For 3D aerobatics with hovers: above 1.5:1 (can climb vertically). A ratio of exactly 1:1 means the thrust equals the aircraft weight (barely able to climb vertically).

Motor thrust is measured with a thrust stand: the motor and propeller are mounted to a scale while running at full power, and the reading gives thrust in grams or ounces. Motor manufacturers and communities publish thrust tables for common motor/propeller/battery combinations. Always verify thrust data for your exact setup.

All-up weight (AUW) or take-off weight includes the airframe, motor, ESC, servos, receiver, battery, and any payload. Weigh each component separately on a kitchen scale and sum them. A typical foam sport trainer weighs 400 to 800 g including battery.

Wing loading is the aircraft weight divided by the wing area (g/dm2 or oz/ft2). Lower wing loading means slower, more floaty flight. Higher wing loading means faster but less forgiving flight. Both thrust-to-weight ratio and wing loading together determine how an aircraft flies. This calculator focuses on thrust-to-weight.

Yes. The thrust-to-weight calculation is the same: total thrust / all-up weight. For a multirotor, add the thrust of all motors. A multirotor needs a minimum thrust-to-weight of 2:1 for stable hovering with margin. Racing quads typically run 8:1 to 15:1 for extreme agility.