Czepiela’s Flight Test Refines Rotax 916 iS Power

Red Bull Air Race pilot Luke Czepiela’s pursuit of quicker performance from the CubCrafters Carbon Cub has led directly to a refinement of the Rotax 916 iS engine management software, according to the manufacturer.

Czepiela, one of the world’s most accomplished STOL pilots, is well known throughout the aviation community for his use of Carbon Cub aircraft in numerous Red Bull projects, demonstrations, and performances around the globe. 

Among his many accomplishments, a “Bullseye Landing” of a specially prepared Carbon Cub atop the helipad of Dubai’s iconic Burj Al Arab hotel—one of the most challenging precision aviation feats ever accomplished.

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Red Bull pilots take their aircraft to the edges of the performance envelope and back, and this software upgrade expands that ability.

Given his unique perspective into the performance needs of STOL pilots, Czepiela worked closely with RS Flight Systems to refine the Rotax 916 iS engine management software.

In a news release, CubCrafters stated that pilots can now expect:

• Quicker acceleration during takeoff and go-around operations.

• Improved climb performance and increased cruise speed.

• Improved deceleration and energy management.

CubCrafters noted that unlike traditional performance modifications that require hardware changes, this upgrade is accomplished entirely through software, as no mechanical changes are necessary.

“Pilots will notice the difference from the moment they advance the throttle,” said Brad Damm, CubCrafters vice president, in the news release. “This upgrade isn’t just about better performance numbers—it’s about actually making the airplane even more fun to fly. Luke has accumulated thousands of hours operating Carbon Cub aircraft in some of the most demanding flying environments imaginable. 

“His deep understanding of the aircraft, combined with the engineering expertise of RS Flight Systems, has resulted in a software enhancement that makes an already remarkable airplane even more responsive and capable.”

Czepiela explained that the focus was less on raw performance numbers and more on tangible pilot feel and responsiveness.

“The Rotax 916 iS is already an incredible engine, but we saw opportunities to further optimize how it delivers power throughout the flight envelope,” Czepiela said. “The goal wasn’t simply to increase performance on paper. We wanted to make the aircraft feel more responsive and enjoyable to fly. Whether you’re accelerating for takeoff, climbing into the mountains, cruising cross-country, or setting up for a short-field landing, pilots will notice the difference.”

The upgrade has been evaluated in CubCrafters aircraft equipped with both Hartzell and MT propeller options and is now available for eligible CubCrafters’ Rotax 916 iS-powered models. The performance software upgrade is available immediately and exclusively from CubCrafters for $1,500.

Owners interested in upgrading their aircraft are encouraged to contact CubCrafters customer support for eligibility, scheduling, and installation details.