Story ID: 499 Hemisphere
Textron Aviation's Hemisphere Order Book Officially Opens
By: Kerry Lynch
Caption: The company is opening the orderbook as the program finishes up a series of wind tunnel testing and moves into next development phase.
Word Count: 439
Textron Aviation is opening the order book during NBAA 2017 for its $35 million Hemisphere, which will sit atop the product line as the company steps into the large-cabin market. The company (Booth N3530) has brought a mockup to the convention to showcase the three-zone cabin that will be fitted within a 102-inch-wide fuselage that is 43 feet long from the aft end of the cockpit to the pressure bulkhead on the back side of the in-flight-accessible baggage compartment. The company has developed different options for the interior to demonstrate the flexibility of the aircraft, said Rob Scholl, senior v-p sales and marketing.

The 4,500-nm, Mach 0.90 aircraft is attracting interest from across the board, Scholl said, from corporate operators and fleet owners to individual operators. “We’re really excited about the great feedback we’re getting…as we continue to work with the customer advisory board,” he said.

The order book opens as Textron Aviation engineers start to move off the Longitude program—which is approaching certification in upcoming months—onto the Hemisphere. Noting the company recently wrapped up wind tunnel testing in Cologne, Germany for the aircraft, “now we are going to proceed on to piling people into architecting, sizing structure and starting to design structure,” said Brad Thress, senior v-p of engineering.

The Hemisphere is the first of the Citation program to use a High Reynolds Number wind tunnel test. Thress noted, “Particularly of interest to us is accurate co-efficient of lift in landing configuration and ground effect,” adding those measurements can be elusive. “We really wanted to make sure they were right.”

Textron Aviation used a 6 percent scale model—a little larger than the one used for high- and low-speed tests—that was made of special alloy to withstand temperatures as low as -261 degrees F and pressurization to almost five atmospheres, “a huge amount of energy,” he said. “This is a really cool tool. It’s the first time we’ve ever used it, and we really learned a lot from it. This gives us what we call final iterations of our loads.”

That data is being distilled as the program moves into the next stage of development, Thress said. “The Hemisphere is on track.”

During last year’s NBAA convention, Textron Aviation began providing more details about the aircraft, including announcing that 12,000-pound-thrust Safran Silvercrest engines would power the new twinjet and Honeywell would supply its Primus Epic avionics suite. In addition, the fly-by-wire aircraft will incorporate active-control sidesticks.

Plans are for first flight in 2019 with certification following a year later.