DESIGN: UniCopter ~ Pusher Prop - Variable Speed Rotors and Prop

• This will reduce the complexity of the power train. For information on this see DESIGN: UniCopter ~ Rotor - Disk - Large Chord & Low Tip Speed
• This information may be moved to its own page if it continue to look potentially valid.
• Title; UniCopter ~ Pusher Prop - Fixed Speed Rotors and Prop:
• Notes:
• The Ivo prop has an electrical variable pitch range from 3º to 17º on the tips. (5.7:1) 14º, or inches of helix advancement from 18" to 52" (3:1). In the prop book the Hamilton-Standard props have a 15º or 20º range.
• Consider using a 2-blade, or possibly a 3-blade) rotor that is capable of setting the 'stopped' position to where there in maximum ground clearance between the blade tips and the ground when the prop is not connected to the drive. This will probably necessitate that the blades can be feathered.
• The propeller will not be able to be engaged until the craft has obtained a certain forward velocity or until the pilot has manually engaged it.
• The single speed rotor will most likely be simpler than a variable-speed rotor. Plus it must have a lower horsepower loss. In addition, a hydraulic variable pitch propeller should be simpler and lower cost than the 'Variable Speed Rotors and Prop'.
• However, a Constant Slow-Speed Rotor may not work if the cruise speed is very high. This is because the speed of the rotor for very high-speed flight will be too slow to provide the lift required during hover.

• Rick mentioned the possibility of using a half-toroidal CVJ http://www.sae.org/automag/techbriefs/02-2002/page5.htm

On Google ["half-toroidal" CVT] brings up a number of descriptive web pages.

• Magnomatics
• Magnets offer advantages as an alternative to mechanical gears
• What is the efficiency of this type of variable drive transmission, and does it continuously consume electrical power?
• If electric propulsion improves over the years then the propeller and the rotors can vary their speeds by having separate motors.

• 7,396,209 ~ Continuously variable transmission ~ July 8, 2008
• 7,434,764 ~ Variable speed gearbox with an independently variable speed tail rotor system for a rotary wing aircraft ~ October 14, 2008

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