This is the APC 12x3.8 Slow Flyer Pusher Propeller.
FEATURES: Designed for counter clockwise rotating tractor applications
May also be used in a true pusher application by mounting with the
APC lettering facing toward the front of the aircraft
Long fiber composite construction
INCLUDES: APC 12x3.8 Slow Flyer Pusher Propeller with two Hub Inserts
REQUIRES: ALL props require balancing, this is VERY important, use TOPQ5700.
SPECS: Hub Diameter: 0.50"
Hub Thickness: 0.30"
Shaft Diameter: 1/4"
Propeller Weight: 0.63oz. (17.9g)
COMMENTS: Not for use with gasoline engines