86c3a3b5c4
propeller pitch stops for constant speed propellers. The default values are the same as the previous hard-coded values. The new attributes, "fine-stop" and "coarse-stop", are documented in the base package, Docs/README.yasim.
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
#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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void setStops (float fine_stop, float coarse_stop);
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void setTakeoff(float omega0, float power0);
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void modPitch(float mod);
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void setPropPitch(float proppitch);
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void setPropFeather(int state);
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void setManualPitch();
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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 _baseJ0; // ... uncorrected for prop advance
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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 _tc0; // thrust "coefficient" at takeoff
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float _fine_stop; // ratio for minimum pitch (high RPM)
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float _coarse_stop; // ratio for maximum pitch (low RPM)
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bool _matchTakeoff; // Does _tc0 mean anything?
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bool _manual; // manual pitch mode
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float _proppitch; // prop pitch control setting (0 ~ 1.0)
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float _propfeather; // prop feather control setting (0 = norm, 1 = feather)
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};
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}; // namespace yasim
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#endif // _PROPELLER_HPP
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