HOW TO’S

The following items can be evaluated by the methods in this chapter.

page

Coefficients, nondimensional 15

Coning 31

Contraction of wake, effect on power 58

Disc loading, effective 35

Download penalty 7

Drag coefficient, average 24

Drag divergence penalty 63

Figure of Merit 26

Ground effect 67

Hover performance, numerical calculation method 69

Hover performance, chart method 81

Induced velocity in wake 4

Induced velocity distribution 38

Lift coefficient, average 18

Lock number 31

Pitch at tip, ideal 19

Power coefficient, ideal twist 22

Power, induced 8

Power loading 9

Rotation of wake, effect on induced power 52

Rotational velocity 54

Solidity 16

Stall penalty 63

Tip loss 34

Tip speed from rpm 11

Twist, effect on power 41

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Cq/ot

 

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ОУ or

 

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Cq/ct

 

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Cjla

 

Cjla

 

Cq/(j

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Cjla

 

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CqI(j

 

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Cq/ct Cq/(T

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CjI(t

 

CjI(t

 

CqI a

 

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Q If I I I I_____________ I___ I—- I—- 1

0 .005 .010 .015.020 .025 .030 .035.040 Cq/v

 

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CqI(t

 

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Cq/v

 

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Cq/u

 

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