These are the R/C Airplane 4.2x2 APC Sport Propellers by Landing Products.
FEATURES: APC props are manufactured using a pultrusion process. This method
causes the fiberglass "fibers" to be oriented axially in 1/2" long
pellets, allowing for a higher fiber (60%) to resin (nylon binder)
density. Providing substantially higher strength and stiffness than
glass filled nylon.
The additional stiffness is beneficial to control of vibration
The higher strength allows the use of thinner cross-sections,
beneficial to weight and aerodynamic efficiency.
Molded in Dark Gray composite material.
INCLUDES: Six APC Sport Propellers
REQUIRES: ALL props require balancing (use TOPQ5700).
May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric).
SPECS: Prop Diameter: 4.2"
Prop Pitch: 2
Hub Thickness: N/A
Hub Diameter: N/A
Engine Shaft Diameter: N/A
updt jxs 02/18/10