HK 36 TC with Rotax 912 S3
Flight Manual
Powered Sailplane
Description
Doc. No. 3.01.12-E
Rev. 1
06 Oct 2003
Page 7 - 12
Propeller
Hydro-mechanical constant speed propeller
mt-Propeller MTV-21-A-C-F/CF175-05
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 cm (5 ft 9 in)
Pitch angles:
low pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14° ± 0.2°
high pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20° ± 1°
feathered pitch . . . . . . . . . . . . . . . . . . . . . . . . 83° ± 1°
at radius . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 cm (2 ft)
Governor
Woodward A 210790 or McCauley DCFU290D17B/T1
Propeller speed control
NOTE
The propeller speed control works differently from the usual
systems in so far as hydraulic pressure is needed to
reduce
the blade pitch.
Small pitch is achieved by applying hydraulic pressure supplied by the governor. A
spring moves the propeller to the feathered pitch position.
Propeller adjustments are made through the propeller speed control installed into the
center console on the right of the throttle control. Pulling the control back to the cam
causes an RPM reduction. The governor keeps the selected RPM constant, independ-
ent of airspeed and throttle control position. If the engine power selected with the
throttle control is not sufficient to maintain the selected RPM, the propeller blades will
move to the lowest possible pitch (maximum RPM at this power setting).