The Clark Airscrew – Aircraft Propellers
“ I say chaps, don’t get caught in a dogfight without a clark airscrew.”
– Sir Percival B. Propwashe
Shown here is the Hawker Nimrod (Naval Version of the Fury) of Aero Vintage of Sussex England sporting her brand new 10 ft.6 in. Clark Airscrew.
This propeller was made up with Honduras Mahogany (nine laminations) for a hub thickness of 8 inches and a hub dia of 10 inches (before the hub-spinner fairing was fitted). The billet weighed in at 200 lbs whereas the finished propeller weighs only 50 lbs!
This propeller (airscrew) was part of an order for five comprising three for the Hawker Fury/Nimrod and two for the Hawker Hind.
Feature Success Story:
David Watson, Splitpin Engineering Services, California
Clark Propeller Classic Airscrew Propeller
Granby pattern climb prop 80 in. dia. 52.7 in. pitch
Static RPM 2,075 Cruise 1950 75MPH indicated at 2500 ft.
Std. Gipsy cruise prop 76 in. dia. 61 in. pitch
Static RPM 1,950 Cruise 1,950 85 MPH Indicated at 2,500 ft.
“As you would expect with your greater diameter and flatter pitch, your prop produces a spectacularly short take off during which I have to throttle back to keep the engine from over speeding. The 1,950 rpm cruise is at about 1/2 throttle. These numbers are suitable for a sea plane prop. The prop operates smoothly with very little vibration. I intend to use the prop when the requirements for take off performance out weigh those of cruise.
I am still looking around for a DH60 cruise prop that better matches the airframe/engine.”