Wipaire, a US aircraft engineering and manufacturing company, and Hartzell Propeller are looking forward FAA STC approval for new Yukon four-blade propellers with improved low-speed thrust providing better takeoff and climb performance in Cessna Caravans.

Deposits are now being taken by Wipaire for the newly designed composite 110-inch diameter props available with or without TKS ice protection or electric de-ice boots. STC approval is expected in the third quarter of 2023, dependent on FAA response times.

“On the Caravan with a Yukon prop, Wipaire flight test results showed there is up to a 26 per cent decrease in total takeoff distance from land and up to a 31 percent decrease in takeoff from water,” says Hartzell Propeller president JJ Frigge. “This translates into safer takeoffs and landings on smaller lakes and shorter runways.”

According to Wipaire, cruise speed is increased at lower power settings, up to two knots faster, saving fuel while increasing speed. Another important improvement is in weight. Coming in at 137 pounds, the Yukon is up to 19 pounds lighter than other available props.

Since the Yukon prototype was first shown at EAA AirVenture in 2022, Wipaire has completed testing on the new prop. The impressive flight performance with the Yukon is a credit to engineers from both companies and Wipaire test pilots.

Wipaire's test results confirmed that there is no change in Caravan stall speeds. Additionally, the Yukon's carbon composite construction and nickel leading edges reduce risks for corrosion.

The new Wipaire Yukon STC applies to: C208 and C208B floated or wheeled; PT6A-114A 675 SHP engine (S/N 208B5000 and up); and PT6A-140 867 SHP engine (S/N 208B5000 and up).