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10
KOPIS 2
Install the Props
If the props are not installed correctly on a quadcopter, it will FLIP OUT when you try to fly. This can
damage the quadcopter. It can also damage property and injure people. Here is how to install the props
correctly.
Props for a quadcopter come in clockwise (CW) and counter-clockwise (CCW) direction. The prop must
be installed on the motor that is spinning the correct direction. Props have a top side and a bottom side.
The top side must face up.
Finding the top side of a prop is easy. The prop will have lettering embossed
on it, such as “5x4x3”. The
lettering is always on the top side. With practice, you can come to recognize the shape of the airfoil and
identify the top of the prop without looking for the lettering.
The lettering o
n the prop will also indicate its direction. Props labeled with an “R”, such as, “5x4x3R” are
clockwise-
rotation (CW). Props labeled without an “R”, such as “5x4x3” are counter
-clockwise rotation
(CCW). Instead of memorizing (and then forgetting) this fact, we strongly advise you to learn to
recognize a prop’s direction from its structure.
If you look at a prop blade, you will see that there is a
high
edge and a
low
edge. The blade is designed to spin in the
direction that the
high
edge is facing.
Think about a fan-blade pushing air. The prop is going to
push air down so that thrust is generated to push the
quadcopter up. Think about which way the prop is going
to push air if it spins one way vs. the other. Seriously. Go
get a prop right now and spend some time looking at it
and thinking about which way it will push air depending
on which way it spins.
The default motor directions for a Cleanflight or
Betaflight quadcopter are shown to the left. Based on this,
the correct way to install the props is as shown.
Notice that the
high
edge of the prop blade faces the
direction that the prop is spinning.
Notice that the
high
edge of the prop blade faces the
center-line of the quad on the front and back of the quad.
This is the simplest way to remember how to install the
props correctly.
High Edge
Faces Centerline
High Edge
Faces Centerline
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