36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
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#ifndef _PROPELLER_HPP
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#define _PROPELLER_HPP
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namespace yasim {
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// A generic propeller model. See the TeX documentation for
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// implementation details, this is too hairy to explain in code
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// comments.
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class Propeller
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{
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public:
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// Initializes a propeller with the specified "cruise" numbers
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// for airspeed, RPM, power and air density, and two "takeoff"
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// numbers for RPM and power (with air speed and density being
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// zero and sea level). RPM values are in radians per second, of
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// course.
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Propeller(float radius, float v, float omega, float rho, float power,
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float omega0, float power0);
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void calc(float density, float v, float omega,
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float* thrustOut, float* torqueOut);
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private:
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float _r; // characteristic radius
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float _J0; // zero-thrust advance ratio
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float _lambdaS; // "propeller stall" normalized advance ratio
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float _F0; // thrust coefficient
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float _etaC; // Peak efficiency
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float _lambdaPeak; // constant, ~0.759835;
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float _beta; // constant, ~1.48058;
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float _takeoffCoef; // correction to get the zero-speed torque right
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};
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}; // namespace yasim
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#endif // _PROPELLER_HPP
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