Audible speed indicator for hang glider
First Claim
1. An audible speed indicator for a movable vehicle, such as a hang glider or the like, comprising:
- (a) a housing adapted to be mounted to the vehicle,(b) an impeller rotatably mounted in the housing,(c) means for varying the passage of air through the impeller to thereby adjust the air speed at which the impeller will commence rotation,(d) electrical pulse generator means driven by the impeller, and(e) audio generator means energized by the output of the pulse generator means, whereby the frequency of the audio generator means output is proportional to air speed.
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Accused Products
Abstract
An audible speed indicator for hang gliders or the like comprises an air driven impeller 16 whose initial point of rotation start-up may be adjusted to correspond to the stall speed by rotating cowling section 14 relative to housing 13 to thereby vary the opening area of side exhaust windows 15. The impeller drives a slotted disc 18 which passes light pulses from a source 19 to a photocell 20, whose output triggers an oscillator 23. The oscillator output energizes a speaker 24, whose audible pulse frequency is thus proportional to air speed. The audio volume may also be reduced or blanked within a predetermined air speed range by a frequency detector 27, whose upper and lower triggering frequencies are adjustable.
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Citations
9 Claims
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1. An audible speed indicator for a movable vehicle, such as a hang glider or the like, comprising:
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(a) a housing adapted to be mounted to the vehicle, (b) an impeller rotatably mounted in the housing, (c) means for varying the passage of air through the impeller to thereby adjust the air speed at which the impeller will commence rotation, (d) electrical pulse generator means driven by the impeller, and (e) audio generator means energized by the output of the pulse generator means, whereby the frequency of the audio generator means output is proportional to air speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification