New Counter-rotating propfan
- Thread starter hesham
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Rolls-Royce's jet engine book that is available online on scribd here
http://www.scribd.com/doc/3490980/Gas-Turbine-Turbojet-Turbofan-Rolls-Royce-The-Jet-Engine
notifies how propfans especially have good use from counter-rotating since the load factor per turbine (propfan's turbine) stage can be high then, meaning you only need a single turbine stage per "prop" and it gets simple, light and reliable.
http://www.scribd.com/doc/3490980/Gas-Turbine-Turbojet-Turbofan-Rolls-Royce-The-Jet-Engine
notifies how propfans especially have good use from counter-rotating since the load factor per turbine (propfan's turbine) stage can be high then, meaning you only need a single turbine stage per "prop" and it gets simple, light and reliable.
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Read the link that he found the images from. The design of the blades as shown negates the need to use a fan shroud. It has many of the advantages of the ducting without the ducting. It's quite an interesting concept.
Woody
Passionate about the advancement of technology
From Hesham's NASA link:-
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090027755_2009028349.pdf
It's a fantastic idea to add winglets to prop blades (perpendicular to the plane of the disk) but this could be applied to all sort of props including helo rotors. But I don't like the idea of joining the blades with the winglets so much as this would rule out any possibility of viable pitch blades but that always seems to go once a prop becomes a prop-fan or ducted, for no adequately explained reason.
Very interesting find none the less.
Cheers, Woody
