Item 0721
DESIGN: SynchroLite ~
Rotor - Disk - Downwash - Single Disk in Hover
Drawing:
Notes:
Calculations are from Microsoft Access forms [Helicopter Specification] & [Flight - Hovering].
Based on: Thrust = gross weight = 550 lbs; Effective disk area of 338.44; Rotor diameter of 17' 4"; Twist of 0.667 degrees per foot.
If the calculations below were for 1 disk only i.e. Based on a thrust of 550/2 = 275 lbs; an actual disk area of 235.93 sq-ft and the same rotor diameter then the loading at blade element 7 would be 1.17 lb/ft2.
The figures below should be considered a lateral side view looking down the Y-axis.
|
Blade Element |
CT w/ tip loss |
Velocity (ft/sec) |
Loading (lb/ft2) |
|
0 |
0.0 |
0.0 |
0.0 |
|
1 |
0.00007 |
0.39 |
0.03 |
|
2 |
0.0002 |
1.12 |
0.10 |
|
3 |
0.0005 |
2.80 |
0.26 |
|
4 |
0.0011 |
6.16 |
0.54 |
|
5 |
0.0018 |
10.08 |
0.89 |
|
6 |
0.0025 |
14.00 |
1.23 |
|
7 |
0.0033 |
18.48 |
1.63 |
|
8 |
0.0041 |
22.97 |
2.02 |
|
9 |
0.0048 |
26.89 |
2.36 |
|
10 |
0.0047 |
26.33 |
2.32 |
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Last Revised: November 7, 2001