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A developmental unit after test assembly in Selma California.  Upper and lower rings were not attached. We had a meeting to go to. Total time to assembly with no power tools and no hurry was 45 minutes. Rings would have added another 10 minutes. Noise in background is highway close by.

Test unit at Susuin Bay, north of San Francisco Bay, California. Mounted on test stand to test braking and to gather data. Rotating rapidly in relatively light winds. Recorded with phone camera. Sound in the background is the wind not the turbine. This design is virtually silent.