Duplo rotating parts, rotors for helicopter / Duplo Drehteile, Rotoren für Hubschrauber

Here is a collection of rotors for duplo. A big one for a helicopter as well as two small ones for a turntable ladder, crane etc. One of the small ones has rounded edges at the upper part, so that it won’t collide with knobs of neighbouring bricks.

You will need a FR4-ZZ Miniature Flange Ball Bearing with inner diameter d = 6.35 mm / 0.25 inch, outer diameter D = 15.88 mm / 0.625 inch and a height B = 4.98 mm / 0.196 inch. You can get them for about 2€on ebay or so. If needed you can glue the