Reversible Propellers for Propeller Turbines

Reversible propellers, used primarily for propeller turbine installations, are similar to the feathering propellers except that the pitch is extended into a beta range and additionally a hydraulic low pitch stop is introduced. Mechanical pitch stops are at full feathering and full reverse.

The hydraulic low pitch stop, which prevents the blade pitch from entering the reverse range unless desired, consists of a "beta" valve which stops the governor oil to the propeller when the pitch reaches the low pitch position. This valve is actuated by a linkage to the pitch change piston or piston guide rod. In order to move the propeller into reverse, the pilot basically changes the linkage to the beta valve, that is connected with the throttle lever, which allows the propeller to travel into reverse.

The beta feedback connection of the propeller is either external (PT6A...Series or Walter M601-Series) or internal (TPE-331-Series or Allison)

The propellers include full feathering and reversing.

Natural composite blades with fiber reinforced epoxy cover and metal leading edge protection are used to minimize weight at the highest amount of safety against fatigue fractures due to vibrations.

Optionally MT-Propeller aluminum blades may be used. In this case a weight increase by 30% is expected.


Available certified Propeller Models (pdf):

MTV-5-( )-R(A),(P), MTV-9-( )-R(A),(P),(W), MTV-16-( )- R(A),(P),(G),(W)
MTV-25-( )-R(A),MTV-27-( )-R(P),(G),(W)

Propeller Designation System (pdf)

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