Attachment_B_-_Adapters_and_Hardware.pdf

Attachment B: Adapters and hardware

Two adapters are necessary to connect the blades to the existing hub spindles of the CART-2 wind turbine while also creating a downwind precone angle of 12.5°. Possible adapter configurations are shown in Figure 1--Figure 3.

The spindle geometry and the prescribed bolt-hole pattern are shown in Figure 4--Figure 5.

The Subcontractor shall either fabricate or design and fabricate the two adapters depending on the stipulated contract with NREL.

The Subcontractor shall further source the necessary fastener sets for connecting the blade to the adapter and the adapter to the hub-spindle. The Subcontractor will need to provide tensioning/torqueing specifications for the installation.

Material: Steel (the Subcontractor could propose alternatives to be approved by NREL)

Blade Bolt Circle Diameter: TBD, depending on adapter configuration Blade Stud Holes: TBD Spindle Stud Holes: refer to Figure 4--Figure 5

Figure 1. Example of adapter plate with thru and tapped holes.

Figure 2. Example of adapter plate with thru holes.

Figure 3. Example of double-flanged adapter.

Bolt # X Y 1 -18.8 2 2 -17 5.6 3 -13.87 8.17 4 -10.1 9.65

5 -6.1 10.4 6 -2.04 10.68 7 2.04 10.65 8 6.1 10.33 9 10.1 9.5

10 13.8 7.7 11 16.9 5.1 12 19.4 2 13 19.4 -2 14 16.9 -5.1 15 13.8 -7.7 16 10.1 -9.5 17 6.1 -10.33 18 2.04 -10.65 19 -2.04 -10.68 20 -6.1 -10.4 21 -10.1 -9.65 22 -13.87 -8.17 23 -17 -5.6 24 -18.8 -2

Figure 4. Spindle bolt-hole pattern. Hole locations referenced to center.

-15

-10

-5

-30 -20 -10 0 10 20 30

Spindle Bolt Holes

Figure 5. Drawing of the spindle. The studs will need to be long enough to go through the thickness of the spindle plate.