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Title: Servo Load Calculators Post by: Chuck Baker on February 16, 2008, 12:17:02 PM Received these from the E-Flight email distro list:
There have been many versions of a servo torque calculator on the web. Chuck Gadd has one on his web site. http://www.csd.net/~cgadd/eflight/calcs_servo.htm (http://www.csd.net/~cgadd/eflight/calcs_servo.htm) Torque(oz-in) = 8.5E-6 * ( C2 V2 L sin(S1) tan(S1) / tan(S2)] Where: C = Control surface chord in cm L = Control surface length in cm V = Speed in MPH S1 = Max control surface deflection in degrees S2 = Max servo deflection in degrees And a slightly more complicated one: http://www.geistware.com/rcmodeling/calculators.htm (http://www.geistware.com/rcmodeling/calculators.htm) The mathematical model: "t = (AMPC2LV2) / (4RT)" where: t = servo torque A = sin(S) * tan(S) / tan(s) S = control surface angle from neutral s = servo arm angle from neutral M = molecular weight of air (~28.6 g/mol) P = air pressure (1 atm) C = average chord length of control surface L = average length of control surface V = airspeed T = air temperature (~290 K) R = ideal gas constant (82.056 atm cm3 / mol K) |