Tom van der Zanden created this incredible puzzle in 2010. It unites both mechanisms of a Helicoper Cube and a Skewb in one puzzle. The internal mechanism of the puzzle is highly complex as it can be seen in Tom's Shapeways shop.
Although the parity of the Helicopter pieces becomes disturbed by the additionally possible Skewb turns, it is on the other hand maybe even easier to solve because there are more cuts and therefore more turning options as they are with a usual Heli Cube.
A the puzzle has standard Helicopter Cube size, the standard Helicopter Cube stickers can be ordered from Cubesmith.
Size: edge length 5.9cm
External LinksShapeways: Helicopter Skewbhttp://www.shapeways.com/model/142458/helicopter_skewb_puzzle___190____175_.html?gid=sg7770