17 x 12.5 Specialist Prop. NarrowAPC model aircraft propellers have enjoyed strong acceptance and growth since their introduction in 1989. They are especially popular in pattern and racing events, and are used world wide by top competitors. Multi rotor aircraft have also taken advantage of the superior performance of APC propellers. The performance and low noise advantages are largely due to the precision methods used to design and manufacture APC propellers. APC preserves a close