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Winter Airspeed Indicator - $250 (Boulder)
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Removed in working order from a Stemme S12 as part of a panel upgrade.
Roughly half the price of a new instrument.
Airspeed indicators measure the difference between total pressure and static pressure. The total (or measured) pressure is sensed by a pitot tube positioned at the stagnation point of the airstream and is carried to the airspeed indicator by a hose. A static pressure sensor can also be connected.The measuring element is an open diaphragm unit with excellent elastic properties; hysteresis (differences between advance and return movement) and secondary elastic effects are negligible. The effect total pressure and static pressure acts on the diaphragm, causing a deformation, that is transferred to the pointer by a linkage and gear mechanism.
Operating ranges of your aircraft will need to be identified by custom colour markings on the airspeed indicator dial (not included).
Price includes shipping to US address.