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This Turn-Mobile suspends light enough moving up to 150 g, and spins fast enough: 60 revolutions / min.
They can be installed in front of large windows (mind the inclination of the sun), and are recommended for artificial skylights and ceiling.
PIECES: 1 engine block v 0.5. wood, with 1 horizontal solar cell 0.5 V 500 mA Max.
SIZE: 8 x 8 cm + length of thread 20 cm
SPEED: choice in below SLOW or FAST options