93| USER MANUAL
Odd numbered booms (1, 3 and 5) use clockwise rotating props when looking from
the top down, and even numbered booms (2, 4 and 6) use counterclockwise rotating
props.
WARNING
Always check to ensure the correct prop rotation direction
and correct propeller prior to flight. Props that spin in the
incorrect direction will cause ALTA to be uncontrollable.
REPLACING PROPELLER BUMPERS
Under normal use, propeller bumpers may split and fall out of the folding propeller
assembly. Six spare bumpers are provided with the ALTA. To replace the bumper,
disassembly of the folding propeller is required.
Start by removing the M3 x 19 bolt and nylon nut. Pull off the upper prop adapter.
The two bumpers are held in place by circular features in the lower prop adapter.
Replace the worn or split bumper with a new one.
To reassemble, follow the part layout in the figure above. Note that there are two
different types of washers, one made of nylon and the other made of PTFE. The
nylon washer is smaller in width and thicker and is installed between the nut or
bolt head and the two prop adapters. The PTFE washer is wider and thinner and is
installed between the prop blades and prop adapters.
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