Experimental Ducted Fan Aircraft Designs

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Scheny

Well-Known Member
Joined
Feb 26, 2019
Messages
179
Location
Vienna, Austria
Use helical gears, they are 5 times stronger at the same weight!!!

For 1:1 sizes they are available off the shelf for low money.
 

Urquiola

Well-Known Member
Joined
Aug 23, 2013
Messages
84
Location
Madrid, Spain
Any specific comment on the use of a 'Counterpropeller'?: fixed vanes after the propeller blades, as vanes in turbines, changing the shape of helicoidal air flow from propeller into somethig more close to a linear, laminar flow.
There was a German inventor, R Wagner, proposing this, patent US1609978.
For sure the pass of propeller blades next to a fixed vane may induce vibrations, it's the engineers' expertise calculating this, but the results may not be clear.
I'd like having this type of arrangement in a Custer Channel Wing machine, and about this, I'm also not sure if the propeller placement in trailing side of Channel, the original Custer way, would yield same results as if put on leading edge, as in Antonov 'Izdelie 181', or over the thickest part of airfoil, or elsewhere. Blessings +
 
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