Thrush Aircraft Designed New Engine Mount for the 510 Series

In 2010, Thrush Aircraft introduced a new aircraft engine mount designed for the 510 series Thrush. It managed to remove the lead-shot ballast ring and create a mini-storage area due to the 18 inches extension. This change improved the flight characteristics by moving the CG, but more importantly, it removed just about 300 pounds of "dead" weight.

The first version of 510 Thrush did not exceed the expectations due to technical issues. The incorporation of the four-blade prop and extended motor mount improved the 510C Thrush abilities drastically. Doran Rogers of Cascade Aircraft Conversions realized the combination of improvements vastly improved the performance; therefore, he developed a 14-inch extended engine mount and isolated the lead shot ballast ring. Moreover, instead of a four blade propeller, he installed an experimental three-blade 180" Avia prop.

Joy and Dave Johnston own and operate Johnston Aircraft Services (JAS) since 1947, previously established by Dave’s father. In 2005, JAS received a 1974 model S2R Thrush, and from that moment on, the aircraft experienced a complete change into a 2016 model Thrush with the Cascade extended engine mount and inlet, 108" Avia prop, and robust PT6A-41 engine. JAS’s shop rebuilt the aircraft from scratch after disassembling it. They added ultrasound checking of the fuselage, sealing axle ends to prevent corrosion from entering, and made improvements as needed.

"Bill, we believe these PT6A-41 and -42 engine takeoffs are by far the best way to go for more power in a Thrush. There is a lot of life left in them at a low purchase price. So low, that when the engine is run out, instead of overhauling it, replace it with another one," explains Dave.

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