Item 1122

OTHER: Aerodynamics - Rotor Disk - Dual Configuration - Intermeshing

Overview:

Intermeshing Craft:

Inside Concepts:

Pros & Cons:

Outside Helicopters and Outside Concepts:

Outside Technical Reports:

Disk Area:

Calculation used for obtaining the area of overlap: Angle is in Radians.

A = 1/2 (R2 (θ - sinθ)) = 1/2 (10 * 10 (2.878 - sin(2.878))) = 1/2 (100 (2.8784 - 0.261)) = 1/2 (100 *2.617) = 130.9

 

Individual Twin Disk:

Combined Twin Disks:

Single Disk:

Radius:

10

~

14.14

Area:

314.3

628.6

628.6

Area of Overlap (Circular Segment):

130.9

261.8

~

Area Excluding Overlap:

183.4

366.8

366.8

Radius based on Area of Twin Disks with Overlaps Excluded:

~

~

10.8

Total Lateral Span:

~

22.63

21.6

Total Longitudinal Span:

~

20.0

21.6

 

The above data and the comments below only consider the main rotors. They do not include the 10-12% tail-rotor power consumption, nor do they include the downwash velocity on the fuselage, which is dependent on its location under the disk(s).

The area of the circular segment is 41.6% of the disk's total area. This would suggest that the power should be considered as; 2 * (17% * isolated rotor power + 83% * co-located rotor power). Using the figures from OTHER: Aerodynamic - Rotor Disk - Dual Configurations, 17% * 65 hp + 83% * 100 hp = 94 hp. In other words to provide a specific thrust will require 65 hp form the side-by-side configuration, 77 hp from the Interleaving configuration, 94 hp from the Intermeshing configuration, and 100 hp from the coaxial configuration.

Induced Power:

xxx (κint)

copied over Intermeshing (Synchropter):

The required power is increased by a factor (K) = 1.46 - (0.253 * (Stagger / R))

Dual Rotor Configurations:

Coaxial | Intermeshing | Interleaving | Side-by-Side | Tandem

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Last Revised: July 6, 2011