Figure 3-2. Two pushers and two tractors.
Efficiency Versus Maximum Thrust
The props we are using on the Little Dipper are 6 × 3. These
have the advantage of providing more power from a larger 6-
inch design, yet higher eciency from the 3° pitch. If you are
looking for more speed for your aircraft, try a higher-pitch prop
like a 6 × 4.5. Remember: the higher the pitch, the more air is
passed through the prop, at the cost of using more power from
the battery.
Balancing Props
Here we
find ourselves drawing another parallel between tires
and propellers. Just as your tires need to be balanced to spin
smoothly at high speeds, so too do your props. This is a delicate
procedure, but one that is critical for anyone in this hobby to
master. When you balance your props, you are making sure that
each blade of the prop has an identical weight and will reduce
the amount of vibration as it spins at high revolutions per
minute (RPM).
44 Make: Getting Started with Drones
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