Engineering:Ground-adjustable propeller
A ground-adjustable propeller is a simple type of aircraft variable-pitch propeller where the blade angle can be adjusted between pre-set limits of fine and coarse pitch.[1] As its name implies, a ground-adjustable propeller may be adjusted only when the aircraft is on the ground and when the engine is not running.
Ground-adjustable propellers, which are mostly used on light and very light aircraft, are much cheaper and lighter than more sophisticated and versatile in-flight-adjustable propellers. A ground-adjustable propeller allows pitch changes to be made, although not in flight, to optimise the aircraft for current payload and flying conditions.[2]
Adjustment
To adjust the propeller, the blades are loosened in the hub, a new angle set and then the hub tightened.[3] The process is one of compromise, and of trial & error. After a flight, if, say, climb seemed too sluggish, the pitch angle may have been set too coarse and would need to be made finer. Alternatively, if the aircraft reached take-off speed quickly but struggled to reach a comfortable cruise speed, the pitch would need to be coarsened. The person making the adjustments would be advised to do so in small increments until a satisfactory outcome were reached.
Manufacturers
See also
References
- ↑ Crane, Dale: Dictionary of Aeronautical Terms, third edition, page 86. Aviation Supplies & Academics, 1997. ISBN 1-56027-287-2
- ↑ "Adjustable-Pitch Propellers (Part One)". Flight Learnings. http://www.flightlearnings.com/2009/09/20/adjustable-pitch-propellers-part-one/. Retrieved 6 June 2015.
- ↑ Experimental Aircraft Association (9 December 2010), Adjusting a Ground-Adjustable Propeller , retrieved 6 June 2015
- ↑ "Arplast Hélice sarl" (in fr). Arplast-helice.com. http://www.arplast-helice.com. Retrieved 2013-06-01.
- ↑ Dave Loveman. "IVOPROP Ground Adjustable Magnum Propeller >". Ivoprop.com. http://www.ivoprop.com/magnumodel.htm. Retrieved 2012-04-30.
- ↑ "Warp Drive Carbon fiber Composite Propellers". Warpdriveprops.com. http://www.warpdriveprops.com/. Retrieved 2012-04-30.
- ↑ "ON GROUND ADJUSTABLE PROPELLER – TYPE KLASSIC 170 - WOODCOMP". Woodcomp.cz. http://www.woodcomp.cz/en/klassic170.php. Retrieved 2012-04-30.
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