RC Skirtless Hovercraft - Lift Motor Clamp Mount 12x12mm beam
thingiverse
This is the mount that clamps the lift motors to the spar of the hovercraft. The bolthole pattern is standard 23mm X with 3mm dia holes as used in common Turnigy etc motors. My standard spar is '12x12mm' balsa, however the actual dimensions can vary significantly. Some '12x12mm' is actually 1/2" x 1/2" cuts which is 12.7x12.7mm. I also wrap a layer of tape around the clamp area to protect the wood surface. All this means my actual clamping width can be ~13.4mm in practice. The multiple increments should allow you to find one that suits your particular beam.
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