Helicopter airspeed indicating system
First Claim
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1. An on board apparatus for estimating the low end airspeed of a helicopter during flight comprising:
- means for determining the helicopter applied power;
means for determining the weight of the helicopter;
means for storing predetermined confirmed measurements of the airspeed of the helicopter at various applied powers and weights;
means for determining an estimated airspeed using the determined power and weight and the stored measurements, and for outputting a signal; and
indicator means coupled to said determining means and responsive to said signal for displaying the estimated airspeed.
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Abstract
This invention provides a helicopter airspeed indicating system for providing an indication of a theoretical airspeed of a helicopter in which it is fitted. The airspeed is calculated using measured weight and power values and a known relationship between power, weight and airspeed characteristics of the helicopter, and is particularly useful for providing an indication of helicopter airspeed at the low end of an overall speed range.
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11 Claims
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1. An on board apparatus for estimating the low end airspeed of a helicopter during flight comprising:
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means for determining the helicopter applied power; means for determining the weight of the helicopter; means for storing predetermined confirmed measurements of the airspeed of the helicopter at various applied powers and weights; means for determining an estimated airspeed using the determined power and weight and the stored measurements, and for outputting a signal; and indicator means coupled to said determining means and responsive to said signal for displaying the estimated airspeed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An on board method for estimating the low end airspeed of a helicopter during flight comprising the steps of:
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determining the helicopter applied power; determining the weight of the helicopter; determining an estimated airspeed of the helicopter and outputting a signal based on predetermined confirmed measurements of the airspeed of the helicopter at various applied powers and weights; and displaying the estimated airspeed on an indicator responsive to the outputted signal. - View Dependent Claims (9, 10, 11)
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Specification