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48     Bu il d  Y o ur  O w n  Q u a d c o p t e r




































                             Figure 3.21  Motor mount assembly diagram.


                                1.  Gather the items listed in the Figure 3.21.
                                2.  Attach each motor (item 1) to a motor-mount bottom plate (item 8). Use four 3-mm
                                    × 6-mm screws (item 9) for each motor.
                                3.  Use two  ∕8-in (1-cm) pan-head screws (item 5) and two internal tooth-lock washers
                                           3
                                    (item 6) to attach two  ∕8-in (1.6-cm) nylon standoffs (item 7) to each motor-mount
                                                      5
                                    bottom plate. Use two more  ∕8-in (1-cm) pan-head screws and internal tooth-lock
                                                           3
                                    washers (item 6) to attach each motor-mount top plate (item 3) to the nylon standoffs
                                    (item 7).
                                4.    note:  I have added the following step to tidy up the boom wire installation.
                                    Drill a  ∕32-in (0.4-cm) diameter hole that is located  ∕2 in (1.3 cm) away (toward the
                                                                             1
                                         5
                                    motor end) from one of the two holes that are spaced 2 ∕4 in (7 cm) apart. Refer to
                                                                                 3












                             Figure 3.22  LED power lead access hole position.
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