JULY 2022. Blues Vol 38 No. 7

on the market. Today,

on the market. Today, there are only five serious contenders — and apart from the seven-place DA62, only two of these, the Beech Baron G58 and Piper Seneca V, offer more than four seats. A Flying SUV Seven seats in a twin in this class, by the way, is quite an engineering feat. I’m not a fan of describing any airplane as an “aerial SUV” — even if, yes, it’s roomy inside and has a decent payload — because the label is almost always an exaggeration dreamed up by someone in the marketing department. But in the case of the DA62 it would be ignoring a glaringly obvious design characteristic not to mention it. With its third-row seating option, oversize doors and seats that fold flat to accommodate bulky items, there’s no other way to say it — the DA62 is a sport utility vehicle with wings. That’s no accident. In developing this airplane as an evolutionary step up from the four-seat DA42, Diamond Aircraft founder and CEO Christian Dries challenged his engineering team to create a safe, simple-to-operate, fuel-efficient twin and wrap it around a passenger compartment mimicking the latest luxury SUVs. Unlike gas-guzzling sport utility vehicles, though, the DA62 boasts outstanding fuel economy. Its twin 180-horsepower Austro AE330 diesel engines burn less than 10 gallons per hour per side at maximum continuous power, propelling the airplane to a top speed of right around 200 knots. Pull the throttles back to 75 percent power and the speed is still a respectable 187 ktas, but fuel burn drops to just 7.4 gph per side — an impressive 14.8 gph total that’s lower than a number of light-piston singles can manage on one engine. The DA62’s cabin features two seats up front, three in the middle row and two more in back. They fold flat for an SUV-like experience. I had the chance to spend a couple of days flying the DA62 recently on a visit to the Diamond Aircraft factory at the company-owned Wiener Neustadt East Airport south of Vienna. I came away from the experience persuaded that, for the right buyer, this is very nearly the ideal airplane. If, for example, you need seven seats versus the five or six offered in competing airplanes, the DA62 makes perfect sense. If you also don’t have access to a ready supply of 100LL avgas, the DA62 is a great alternative to gasoline-powered models. And if you simply feel more comfortable flying over inhospitable terrain or water, sometimes at night, and desire the power and systems redundancy that come with a second engine, the DA62 should absolutely be on your shopping list. There are other reasons to like the DA62 as well. One of the characteristics that left an impression on me is how dirt simple this airplane is to operate. Take the engine start procedure, for example. It involves the easyas-pie steps of hitting the master switch, flipping the engine master on, waiting a moment to ensure the glow plug annunciation is out and then pushing the engine start button. That’s it. The ¬Austro diesels come to life in an instant as the dual-channel full authority -digital engine controls (fadec) manage rpm and continuously check for faults while your only other job is to glance at the oil pressure indication. As long as the gauges are in the green, you’re good to go. The before-takeoff run-up procedure is equally as stress free. It involves setting the parking brake, manually selecting the A and B channels of the electronic engine control units (EECU) to ensure both are online, and then pushing and holding the engine run-up buttons. Here’s where the magic starts as the AE330’s fadec computers automatically increase power to 1,950 rpm and perform a number of health checks, including cycling the props. The throttles never physically move and there aren’t any prop levers to move in the first place. If no fault messages ¬appear on the Garmin G1000 primary flight display when the test sequence is completed, you’re ready for departure. In this case, that meant swinging the airplane onto Wiener Neustadt’s Runway 10 with a 25-knot direct crosswind blowing from the left. I added a fistful of that smooth diesel power and, per the book, rotated at 80 knots. Acceleration to 95 knots for the climb-out was brisk as I began the bizarre sequence of noise-abatement twists and turns designed to keep air traffic away from residential areas as well as a military airfield right next door to the airport. The DA62’s diesel engines are encased in cowlings that seem oddly misshapen, a result of packaging Mercedes-Benz car engines on an airplane. Climbing to 5,000 feet at 110 kias, the DA62 maintained a 1,450 fpm rate of climb at our midweight with two on board and half fuel. Accelerating to a cruise climb speed of 128 kias produced a 1,200 fpm rate through 8,000 feet. That’s when I asked my host in the right seat, Diamond Aircraft director of flight operations Martin Scherrer, for a demonstration of the DA62’s ¬single-engine performance. Still climbing, at his direction I flicked off the left engine master switch (the left is the critical engine in the DA62). The ¬propeller immediately stopped, automatically feathering as it did so. The airplane lurched left as a result of loss of thrust on that side, and I instinctively raised the left wing, stepped on the rudder, and then dialed in rudder trim to compensate. After that, the airplane was as easy to fly on one engine as on two. Earning a multiengine rating in a DA62 with its two power levers (opposed to the usual six levers found in most piston twins) would almost be cheating, I decided. I let the speed come back to the 87-knot blue line (single-engine best rate-of-climb airspeed) and was impressed to see us still climbing at 450 fpm. Speed Test Next I wanted to evaluate the DA62’s cruise performance to see if this really is a 200-knot airplane as Dries originally envisioned. I leveled off at 14,000 feet with the throttles pushed full forward to max continuous power of 95 percent and let the speed build. On this day, slightly warmer than standard and a little lower than optimal, I managed to coax 195 ktas from those twin AE330s while burning 18.6 gph. Hitting 200 knots in a Beech Baron in similar conditions would result in a fuel consumption of around 30 gph, so I wasn’t terribly disappointed with the results I was seeing. I tried out a variety of power settings and found what I considered a sweet spot at 60 percent power showing 170 ktas and 11.8 gph fuel consumption. After heading lower and trying a series of steep turns and power-on and -off stalls (which were, predictably, nonevents with nothing more dramatic than a slight wing drop in the stalls), 42 The BLUES The BLUES 43