2.5in Counter-rotating 3-blade spinner
thingiverse
This counter-rotating spinner is an adapted form of my 2.5in 3-blade variant (http://www.thingiverse.com/thing:44872). The negative offset base remains unaltered from the original rotating spinner. I reuploaded it for convenience. It's specifically designed to match an 8" or 9" x 6-7" 3-bladed counter-rotating propeller. Version 1 of the base features a negative offset, with the bottom edge of the spinner sitting "below" the prop adapter by .3125". Version 2 has a normal offset of about .050". Both versions share the same cap design. The cap and base are secured together using M3x12-14mm socket head cap screws. Despite its lightweight structure, I haven't had the chance to physically print this version yet.
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