Page 38 - Build Your Own Quadcopter_ Power Up Your Designs with the Parallax Elev-8

Chapter 2: Quadcopter Flight Dynamics 17

Figure 2.5 CCW Elev-8 propeller.

propeller’s pitch, not to be confused with the aerodynamic pitch describing an airplane’s
attitude. A large propeller pitch number means it takes a large “bite” out of the air for every
rotation. Conversely, a small pitch number means smaller “bites” are taken by the propeller.
Large pitch also means more torque is required from the driving motor, which translates to
more power required for that motor. The Slo-Flyer description refers to the propeller being
designed for relatively fewer revolutions per minute (r/min) than higher speed propellers.
Slo-Flyer propellers have a top r/min limit of about 7000 r/min, while high-speed propellers
can exceed 15,000 r/min. High-speed propellers often have a small pitch because it would
be impractical to provide the power needed to drive a large-pitch propeller at such high
speeds for any useful length of operating time.
The CW-turning propeller has the designation 10 × 4.7 Slo-Flyer, model LP 10047 and is
shown in Figure 2.6. The only difference between the two propellers is the pitch angle, which

Figure 2.6 CW Elev-8 propeller.