The instrument hoses were connected to the venturi at the point of lowest pressure, creating a vacuum that pulled a steady stream of air through the instruments.Īlthough some VFR-only planes still use this arrangement, the trouble with this setup is that the amount of vacuum is low until certain airspeeds are reached, and the venturi can become ineffective due to ice buildup during inflight icing conditions. The venturi accelerated the ram air pressure produced by forward flight through a narrowed opening. When the earliest airplane gyroscopic instruments were introduced, the only available source for air pressure to spin them was an outside-mounted air venturi. The vanes are allowed to expand outward to their maximum extension at the widest points of the ellipse they travel in. A carbon vane slid out to its maximum travel in its slot. The vanes are free to slide inward and outward as the rotor spins. A rotor with carbon vanes extended, as they would be in operation. The outer vacuum pump housing has an air inlet port on the front of the pump, and an exhaust port on the rear. The rotating carbon vane assembly is housed inside. A look inside your aircraft’s vacuum system.Īn elliptically-shaped aluminum housing with the intake and exhaust ports in it.
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