Item 1071

MAKE: UniCopter ~ Rotor - Blade - NACA 00xx - Assembly

Overview:

XXX

Drawing: Out of date drawing. Must be replaced by drawing similar to 0931.dc

 

Bill of Material 1071

 

Fabrication Notes: (preliminary idea for prototype)

  1. TOOL ~ OTHER: CNC Workstation - Workbench
  2. TOOL ~ MAKE: UniCopter ~ Special Tool - Rotor - Blade - Torque Tube - Mandrel
  3. Winding Torque Tube ~ MAKE: UniCopter ~ Rotor - Blade - NACA 00xx - Torque Tube Winding
  4. Elastomeric twist bearing ~ MAKE: UniCopter ~ Rotor - Blade - NACA 00xx - Elastomeric Twist Bearing
  5. Application of braided S-glass tube over elastomeric twist bearing
  6. TOOL ~ DESIGN UniCopter ~ Special Tool - Rotor - Blade - Spar Web
  7. Spar - Wind and Cure~ Rotor - Blade - NACA 00xx - Spar - Overall
  8. TOOL ~ 3-axis Milling machine
  9. Spar - Machining
  10. TOOL ~ Core Cutter Composite ~ Special Tool - - Core Cutter
  11. Produce two-part core ~ MAKE: UniCopter ~ Rotor - Blade - NACA 00xx - Core
  12. TOOL ~ Produce female blade mold using 3-axis Milling machine
  13. Wrap blade components with blade skins.
  14. Cure blade

Approximate Weight of Blades:

Material for calculations: DA 4518U uni-graphite unidirectional prepreg tape.

Weight: 0.060 lbs/sq ft.

Thickness: 0.006 inch/ply

Weight per square inch: (0.060 / 144) / 0.006 = 0.0694333 lbs/sq in.

Cross sectional area of blade (spar & skin) at tip [NACA 0006 w/ 7" chord]: = 30 * 0.252 = 1.87 sq. in. Assuming that none of this area is core.

If the amount of carbon does not change from tip to root and only the shape changes from flat at the tip to round at the root then the total weight of the carbon in an 9.5 foot blades is: 0.0694333 * 1.87 * 9.5 * 12 = 14.8 lbs per blade.

The core will add approximately 2.0 lbs

The leading edge weight will add approximately 4.0 lbs.

Each blade will weight about 21 lbs.

The six blades will weigh a total of approximately 126 pounds.

  Stiffness and Coupling Requirements:

Same Page ~ Different Craft:

SynchroLite ~ MAKE: Rotor - Blade - Composite - VR-7b - Assembly - 0672

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Last Revised: November 21, 2006