Hovering (ONLY):

Fore PropRotor:

Aft PropRotor:

Total, Ratio, Etc:

Notes:

PropRotor Radius.

5.5 ft.

4.375 ft.

 1.257:1

This ratio is fixed due to cruise.

Disk Area:

95.0 ft²

60.2 ft²

155.2 ft²

This ratio is fixed due to cruise.

Ratio of Disk Areas:

61.2%

38.8%

1.58:1

This ratio is fixed due to cruise.

Number of blades:

4

4

Airfoil:

VR-7

VR-7

Chord:

0.4 ft

0.4 ft

Taper:

0

0

Aspect Ratio:

11:1

10.9:1

Disk Loading:

9.0 lb/ ft²

7.8 lb/ ft²

Rotor Solidity Ratio:

0.0868

0.0873

Linear Twist:

-25º

-25º

Blade Cutout Ratio:

0.15

0.15

RRPM:

1,180

1,385

Tip Speed:

680 ft/sec

630 ft/sec

Tip Mach Nbr:

0.61

0.57

Gross Weight: (lb)

853

472

1325

Total is the fixed target.

Collective Pitch: (degree)

24.0

26.6

Thrust: (lb)

756

636

1,392

The fixed target is 1,325.

Length of Moment Arm: Item 1694

103.33"

110.26"

1:1.067

Moment: (lb-ft)

103 x 756 = 77,868

110 x 636=69,960

Must be equal.

Horsepower: BEMT

63

62

127 hp

Should be balanced.

Horsepower - Max available

62

62

124 hp

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