Ed Cesnalis Posted May 14, 2013 Report Share Posted May 14, 2013 I submitted a request for a quote for a 3 blade composite Scimitar shape prop that can change pitch in flight without any input from the pilot. If it works out I'll have to get a 914. http://www.princeair...com/carbon.aspx How does the Prince P-TIP propeller change pitch? The method the Prince propeller changes pitch is due to the amount of pull the propeller has. When a propeller is at high rpm and slow airspeed the forward face of the blade has the greatest pull. When the propeller reaches the designed airspeed the propeller face has zero pull. To take advantage of this condition we taper or sweep the leading edge of the Prince propeller profile. When the propeller pulls or cones forward in this high rpm slow airspeed mode the outer portion of the blades pull forward. As the blade pulls forward it will untwist the propeller and offer about 4" less pitch. The pitch will start to move back to the higher pitch carved setting as the airspeed increases. An example of the pulling forward or the proper term, Coning, can be seen on helicopters and propellers if you are looking for it. You may have noticed a helicopter rotor in static running the rotors are straight out or running horizontal, when the collective pitch is applied the blades are now in a bowl shape or coning. The blades will lessen in this coning angle as the helicopter increases in its speed and similar the Prince propeller will proceed back to the carved pitch when the aircraft speed increases. So the Prince propeller will be designed for maximum top speed. A common fixed pitch propeller would suffer in the takeoff and climb mode but the Prince propeller will lessen in pitch and provide a better takeoff and climb and not penalize for Top Speed. Many of our customers report their Top Airspeed the same as the constant speed propeller with still great takeoff performance. Link to comment Share on other sites More sharing options...
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