DG Flugzeugbau DG 202, Руководство по эксплуатации самолета

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Vanetype variometer wi th MacCready ring
(preselected flying speed ring)
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 light performance is assured when the airspeed indicated
by the airspeed indicator corresponds to the preselected flying
speed to which the MacCready ring has been set. The MacCready
ring allows gliding distance and final approach to be optimised.
Please refer to the revelant literature for further details. When
ordering, please do not forget to state the type of aircraft in which
the ring will be used.
If the ring is retrofitted to a variometer of older design, the original threaded ring of the instrument must be
removed and replaced by a grooved threaded ring onto which the MacCready ring can be fixed with ease.