Maybe this is old news, but I couldn't find any discussion on it. Great Planes is coming out with a variable pitch system based on it's Rimfire brushless motor:

http://www2.towerhobbies.com/cgi-bin...5&I=LXLXB1&P=K

I stumbled across this by accident, but it caught my eye because I'm curious about variable pitch flying. What you you think? It appears to be able to handle larger planes than most of the current systems out there.
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Great Planes Variable Pitch Prop w/Rimfire 22M-1000 BL for small high performance flat foam airplanes up to 12 ounces (340g)including all ElectriFly FlatOuts.

FEATURES: Revolutionary variable pitch prop system allows pilot to go beyond
hovering and torque rolls. Apply reverse-thrust for slow
downlines, direction-changing aerobatic maneuvers and floor dives
Advanced push-pull design for nearly instantaneous throttle response-
virtually no prop spool-up or spool-down time
Constructed of highly durable steel, aluminum and ABS materials
Aluminum motor case, stainless steel motor shaft
Twin prop blades constructed of fiber reinforced nylon, symmetrical
airfoils
Rotor factory installed onto motor
Magnet motor wires with a maximum 320° F (160°C) temperature rating
Neodymium rare earth motor magnets for high output torque, one of the
_ highest temperature ratings in R/C at 302° F (150°C) which won't
break down like lower quality magnets

REQUIRES: Electronic Speed Control: 12A minimum continuous current rating,
governor function HIGHLY recommended. ElectriFly BL-12VP Brushless
ESC (GPMM2075) perfectly matched for this system
Extra proportional channel on radio
Servo with at least 17 oz-in torque for pitch control
Mounting of blades and linkage adjustments

SPECS: Variable Pitch Prop;
Mechanical Design: push-pull system
Blades (2): symmetrical design, fiber-reinforced nylon
Rotor Materials: ABS plastic and aluminum
Control Rod Material: Steel
Control Rod Dimensions: 0.04" x 6.02" (1mm x 153mm)
Ball Bearings: Five, shielded