Blade pitch gauge attachment for iPhone

thingiverse

Spin your iPhone 4s with Clinometer app as an RC helicopter rotor blade pitch meter using this attachment. Assemble the parts by bolting them together with M3 x 10mm and M3 x 18mm socket head cap screws, ensuring a snug fit for accuracy. Note that the mount works best without any case or screen guard. The "pg Phone Mount Main v2" file includes a small rectangular piece to bolt onto the front of the main part; simply print it out, cut off the piece and attach.