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Funding spurs DeltaHawk diesel improvementsFunding spurs DeltaHawk diesel improvements

General aviation diesel engine projects continue slow progression toward certification and acceptance by consumers. Among the longest in development is DeltaHawk, which was announced more than 16 years ago. At EAA AirVenture in late July, company officials say they will not be delivering engines by the end of 2016, as predicted in 2015. However, they say, the delay is because of efforts to continue improving components that will result in better efficiencies and longer engine life.
The DeltaHawk diesel engine was announced more than 16 years ago but company officials said delivery of the powerplant has been further delayed until after 2016. Photo courtesy of DeltaHawk.

DeltaHawk CEO Christopher Ruud reiterated his family’s commitment to funding the project through certification and production. The Ruud family bought a controlling interest in the project in early 2015.

Since then, there has been significant investment in new manufacturing and testing facilities at the company’s Racine, Wisconsin, headquarters, and continued refinement of component design. With the additional funding, engineers have validated the basic V-4 engine configuration, according to Dennis Webb, director of marketing and certification. However, there have been enhancements to the design of the turbochargers, superchargers, and cylinders, along with changes to the fuel system.

The DeltaHawk diesel engine is fitted to a Cirrus SR20. Photo courtesy of DeltaHawk.

Over the years, the engine has flown on a Velocity and soon will fly on a Twin Velocity. It will fly again on a Cirrus SR20 later this year. The first supplemental type certificate for the 180-horsepower engine will be for aircraft in the category of Cessna 172s and Piper PA-28s, according to Webb. The company doesn’t plan to sell any engines into the experimental market until it is certified. A new date for certification has not been announced.

Thomas B. Haines

Thomas B Haines

Editor in Chief
AOPA Editor in Chief Tom Haines joined AOPA in 1988. He owns and flies a Beechcraft A36 Bonanza. Since soloing at 16 and earning a private pilot certificate at 17, he has flown more than 100 models of general aviation airplanes.
Topics: EAA AirVenture, Diesel

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