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HeliDev

Well-Known Member
Joined
Jul 7, 2003
Messages
108
This quetion is maninly to orion, however anyone else feel free to post.
In the thread on re-drives in the auto conversion section of the forum, orion mentioned that a 40 inch fan, without ducts or shrouds would make a good cantidate for an aircraft without a re-drive.
Could you expand on this a little further?
Why no duct or shroud? Are you of the opinion that the reduction of the tip losses are outweighed by the drag of the duct or shroud?
In a earlier post on the same thread mention was made reguarding prop efficiency in relation to diameter. You responded that this isnt nessecarily true. That if properly designed, the diameter is not such a big issue.
I have been toying with smaller diameter drives (RC), with larger chords, and getting reasonable results so far. Is this the sort of idea you were thinking of?
If you could also expand on this area as well I would appreciate it.
Sorry for the 30 quetions, its just that I have been looking into this are for a while, and everyone that I speak to thinks Im nuts.
 
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