Hartzell Propeller Inc. (Piqua, Ohio) on April 9 announced that it has developed an advanced structural composite propeller for aerobatic aircraft using its proprietary ASC-II technology. The new Claw 2.0 propeller has recently achieved FAA type certification, meeting all of the propeller certification requirements. The original Claw and the new Claw 2.0 are said to be the only certified advanced composite propellers available for aerobatic use. The propeller has not yet been STC’d on the aircraft; however, Hartzell is making the Claw 2.0 propeller available now for Extra 300 / 330 series aircraft flying in the Experimental category.
Former US Unlimited Aerobatic Champion Michael Goulian used an experimental development version of this propeller on his Extra 330SC during the 2009 airshow campaign, for which he was recognized with EAA’s Bill Barber Award for Airshow Showmanship. He will continue using the propeller during the 2010 air show season.
This latest model from Hartzell comprises a lamination of carbon fiber and Kevlar, with an electroformed nickel leading edge erosion shield. The composite structure is co-molded on an integral stainless steel shank that accommodates bolt-on counterweights needed for aerobatics.
The advantage of installing a certified propeller on “experimental” and homebuilt aircraft is that it has been rigorously tested according to FAA standards, and users can be sure the propeller will withstand all flying conditions. The Claw 2.0 has passed all required certification tests including bird strike, lightning strike and fatigue strength. It has also passed a vibration stress test over the entire aerobatic envelope on Goulian’s Extra 330SC.
Hartzell’s kit for the Extra 300 / 330s includes the 3-blade propeller and a carbon composite spinner for $21,900,