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The involute gear profile is the most commonly used system for gearing today. In an involute gear, the profiles of the teeth are involutes of a circle. (The involute of a circle is the spiraling curve traced by the end of an imaginary taut string unwinding itself from that stationary circle.)
Useful formulas for model-aircraft builders. How to locate the Mean Aerodynamic Chord (MAC), determine the Wing Area, Wing Loading, Aspect Ratio and various other simple to calculate formulas.
To ensure the applicant learns the importance of airplane weight and balance and can properly calculate it for their airplane. P u r p o s e Weight and balance is important because airplane performance and stability is heavily dependent on flying within the published limits. This lesson will introduce pilots to the
T h e F o u r F o r c e s - Airplanes in straight and level flight are subject to 4 basic forces: We i g h t - We i g h t is the downward force provided by gravity. As an airplane sits stationary on the ground, the only force acting on it is gravity. L i f t - Li f t i s the upward force provided by the wing.
Introduction Statistical weight equations, although capable of producing landing gear group weights quickly and generally accurately, do not respond to all the variations in landing gear design parameters. In addition, the equations are largely dependent on the database of existing aircraft.
W = The weight of the aircraft. (N) T = The thrust of the aircraft. (N) L w = The wing loading. (Pa = N/m2) n = The load factor. (no unit) Two-dimensional aerodynamics formulas The pressure in a certain part of the atmosphere is equal to the weight of the air column on top. The formula describing this statement is known as the hydrostatic equation:
Flight dynamics forms one of the four basic engineering sciences needed to understand the design of flight vehicles, as illustrated in Fig. 1.1 (with Cornell M&AE course numbers associated with introductory courses in these areas).
