Propeller Aerodynamics by Frank Hitchens

Author:Frank Hitchens
Language: eng
Format: epub
Tags: propellors, prop plane, prop, airscrew, aerodynamics, aircraft, airplane, aeroplane, operation, history, propellor pitch, propellor types, thrust, efficeiency, stability, propellor noise, forces, physics, CSU
ISBN: 9781785381249
Publisher: Andrews UK Limited 2015
Published: 2015-05-11T00:00:00+00:00

The Short Belfast T1 turboprop transport with de-iced props. This Belfast is on show in the RAF Cosford Museum, England.

As far as the electrical and chemical systems are concerned, there is no difference between anti-ice and de-ice systems. It is all a matter of timing, anti-ice prevents and de-ice cures. If icing is expected, prevention is better than a cure, so turn on the anti-ice system early before the ice has a chance to buildup to a dangerous level. If you have the misfortune to experience prop icing with no anti-ice system on board, it maybe possible to remove the prop ice by flexing the blades using centrifugal force. This can be achieved by reducing the engine speed to around 2200 RPM with the propeller pitch control, then quickly move the prop control to fine/flat pitch. Several cycles maybe required to restore the prop to smooth running. After clearing the ice, or if icing is expected, run the engine at a higher RPM than normal to reduce the chance of ice forming. Finally, one last word on prop icing: keep the prop blades smooth and clean and apply a coating of silicone spray, it just makes it that little bit harder for the ice to cling to the blades.

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