B465

DESIGN: ~ Single-Bladed All Electric Rotor - Disk

Disk and Power Specifications: Item #0036 in Access database.

Gross Weight: 550 lbs. 254 lbs. for craft and 296 lbs. for pilot and batteries.

Disk Radius: 10 feet

Chord: 1 foot

Aspect Ratio: 10:1

Disk Area: 314 * 2 = 628 sq-ft.

Rotor Solidity Ratio: 0.032

Disk Loading: 0.88 lb / sq-ft

Blade Loading: 27.5 lb / sq-ft

Blade: NACA 0012, VR-7

Twist: -8º with NACA0012 blade, -6º with VR-7 blade

Collective Angle for Hover: 10.2º with NACA0012 blade, 5º with VR-7 blade

Total Power for Hover (by Momentum): 20 hp.

Total Power for Hover (by Blade Element): 32 hp with NACA0012 blade, 25.5 hp with VR-7 blade

Lift / Power Advantage: (It should be noted that these calculations for such a small helicopter, plus the single blade might be erroneous)

1-blade per rotor with Above Specifications.

2 separated disks will need 25.5 hp with VR-7 blade

2 blades per rotor:

Chord = 0.5 feet. Collective pitch = 4.6º

2 separated disks will need 23.0 hp with VR-7 blade.

The advantage of the 1 blade per rotor should be the location and weight of the motor and powertrain (hopefully).

Items:

DESIGN:

	Name	Item
	Single-Bladed All Electric Rotor - Disk - Forces & Moments	1489
	Single-Bladed All Electric Rotor - Disk - Vibration - Rotor Induced	1496

MAKE:

Last Revised: February 3, 2006