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Nowadays, the MacCready type ring is an indispensable aid in cross country flying. The ring is rotatable and is marked with speeds and a white triangle. The chief use of MacCready ring is to achieve the highest possible cruising speed (average cross country flying speed) on thermal cross country flights. This involves setting the white arrow to the anticipated rate of climb for the next upcurrent. Optimum flight performance is assured when the airspeed indicated by the airspeed indicatorcorresponds to the preselected flying speed to which the MacCready ring has been set. The MacCready ring allows gliding distance and final approach to beoptimised.
MacCready Speed Rings work only with Winter Instruments Variometers. They attach to the instrument face with a special bezel. Delivery time for a factory marked ring is about 4 weeks. Blanks are also available. Speed Rings are available for both 57mm and 80mm variometers.