Item 1309
DESIGN:
UniCopter ~ Rotor - Disk - Comparison - Sikorsky ABC vs. UniCopter
Preliminary Thought:
Because the UniCopter is not intended for high forward speeds, it makes sense to produce the 3-blade rotor. If higher speeds are desired in the future, there would be the option of developing the 4-blade rotor or incorporating any advanced blade element control features into the 3-blade rotor.
Comparison:
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Sikorsky ABC: |
UniCopter: |
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3-blade Rotor |
4-blade Rotor |
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Rotor Angular Velocity: Ω |
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rad / sec |
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Advance Ratio: μ= V/ΩR |
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Aspect Ratio: |
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Tip Chord Ratio: |
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Solidity: σ = (b) * (c @ .75R)/ πR |
0.111 |
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xx Coefficient: CL/σ |
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Torque Coefficient: CQ/σ |
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Drag Coefficient: CD/σ |
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Subjects Covered in:
Technical Documents on ABC:
Forward Flight Performance of a Coaxial Rigid Rotor, V. M. Paglino, May 1971Radial Flow Effect:
Reverse Flow Drag Effect:
Rotor Separation Effect:
Wake Interference Effrect:
Root/Tip Thickness Ratio Effect:
Root/Tip Chord Ratio Effect:
Radius Effect:
Root Cutout Effect:
Blade Twist Effect:
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Last Revised: June 23, 2005