Item 1525
DESIGN:
Electrotor-SloMo ~ Rotor - Disk - Loading
Sketch of Interleaving Configuration:
Re Diagonal Lines:
This drawing shows the advantage of twin interleaving rotors. The inner rings are at 75% of rotors' radii. 50% of the thrust is generated in the outer 25% of rotor disks. The overlapping area of the outer 25% of the two disks is only 7.5% of the total disk areas.
This 7.5% of the disk area is generating more lift than any other area, however it is less efficient because it's lift, per rotor, is less because the induced velocity in this area is greater.
Re Circles:
The lift near the root at 270º azimuth may also be affected detrimentally. This is because the tip of the blades of the other rotor are producing a high lift as they pass the other rotor's mast, then the root of the rotor's blade passes into the area and stops any residue from the induced flow. Perhaps high twist, large cutout and/or no taper may help.
The efficiency of the Interleaving configuration is likely less than that of the Side-by-side configuration. However, both of these configurations do not waste the 10-12% tail power that the single rotor does.
Forward Flight:
The rotors are 'absolutely' rigid and the system uses the advancing blade concept and the rotors turn outside forward. Therefore as the forward velocity increases the downwash between the masts of the two rotors will decrewase.
Calculations:
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Last Revised: May 21, 2010