Variable pitch propellers have a distinct advantage compared to fixed pitch models. This translates into a more fuel efficient, higher performing aircraft with much improved rate of climbs and shorter takeoffs for those tight places!
Airmaster Propellers, Ltd from New Zealand is a manufacturer of high quality electrical constant speed propellers with various options like feather, manual pitch control with hold and factory presettable RPMs for takeoff, climb and cruise tailored to your aircraft and engine combination.
The AP3 and AP4 series propeller are controled by the AC200 SmartPitch electronic controller, below you will find the operator manual.
Excerpt from the document:
The 3 & 4 series propellers are fully feathering, variable pitch propellers designed for use on engines up to 120 hp (90 hp when fitted to direct drive engines). The propellers are controlled with the AC200 'SmartPitch' constant speed controller. Airmaster Propellers Ltd currently approve the 3 & 4 series propeller systems for installation on the following types of aircraft engines.
To continue reading see the pdf below: