Now THAT's Original!

We snuck a peek at Zenith's newest airplane on Sunday, and it has certainly got some original features! First, its a big, powerful airplane for a company that has served the LSA market for years. Using a CH750 fuselage, the new CH750 Super Duty now sports an IO-375 engine producing about 200 HP, giving it plenty of power to lift the lengthened, STOL wing quickly out of just about anywhere. The baggage area can accommodate 200 pounds and includes a seat if you want to make at least some of that weight a human being. The tail is similar to the 750's, but larger, to match the longer wing. Sporting Tundra tires, it is bound for the bush. Continue reading "Now THAT's Original!"

Just Aircraft Offers Spoilers Kit for the SuperSTOL

Just Aircraft SuperSTOL

Just Aircraft has announced plans to provide optional instructions and materials for installing spoilers on new SuperSTOL kits. The addition of spoilers significantly enhances slow flight control, especially in undesirable wind conditions. They represent the latest step in advancing the short takeoff and landing capabilities of the SuperSTOL.

Just Aircraft SuperSTOL
The SuperSTOL is now being offered with an optional spoilers kit to improve control at slow speeds.

Troy Woodland, who designed and flight tested the spoilers, said: “once a pilot discovers the advantage of spoilers in slow flight and turbulent air, he won’t want to fly without them. They go a long way toward taking the rock and roll out of rough air on final, and they open up a lot of new areas for landings.”

The kits, which connect the spoilers to the ailerons, take about 40 hours to install. They can be mounted at the factory for an additional charge. Designed to deploy with the ailerons, the spoilers will rise on the right wing when the pilot moves the stick to the right. Since stick movements at cruise speed are minimal, the spoilers have little effect, but in slow speed operations, when the stick movements are greater, the spoilers will reach maximum deployment and effectiveness.

Just Aircraft SuperSTOL

The SuperSTOL wing features slats that extend in slow flight, vortex generators, and fowler flaps all of which are designed to allow the aircraft to fly at a very high angle of attack without stalling. That in turn, allows a touchdown speed in the low 20s in calm conditions.

Optional spoiler kits, which are available only for the SuperSTOL, are priced at $1,000. With factory installation, the price is $2,500. For more information visit

Best Electric Aircraft Symposium Ever?

Kitplanes own Dean Sigler (Alternative Energies) attended this year's Electric Aircraft Symposium in Santa Rosa, CA as part of the faculty for the event, and filed this report in order to keep our readers up to date on the burgeoning new technologies in electrical propulsion and aircraft designed to use it. Watch for additional reports here and in the magazine as we keep abreast of the action in the world of "green flight".

Paul Dye, EIC

It was a humble effort in the midst of the intellectual horsepower and design know-how on display. Barnaby Wainfan, a regular contributor to Kitplanes, gave a brilliant review of what it would take to make an efficient STOL airplane. His experience with the Facetmobile and knowledge of other low-aspect ratio aircraft showed that airplanes that can take off and land in short distances and still cruise at reasonable speeds might look very different from our current ideas of such craft.

Barnaby Wainfan shows inspirations for possible future configurations of efficient STOL aircraft.
Barnaby Wainfan shows inspirations for possible future configurations of efficient STOL aircraft.

Battery developers showed up with promising new developments. Dr. Qichao Hu of MIT and his start-up company, SolidEnergy, discussed his ultra-high energy density lithium battery – not five years out, but due later this year in small formats and next year in larger sizes.

Dr. Avetik Harutyunyan , chief materials scientist for Honda in Columbus, Ohio, talked about “Lithium Storage Capacity in Carbon Nanostructures,” showing research on possible structural, high energy materials including carbon nanotubes, boron and graphene flakes – all impressive and promising.

Attendees saw a variety of motors, starting with Dr. Ajay Misra’s 3D printed ones, which incorporate nano-magnets for greater energy density. These technologies have the potential to increase the maximum energy product in magnets, new electromagnet design, and reduce volume, weight and costs for future motors.

David Calley, CEO of PlanetRider, profiled his transverse flux low-RPM, high power density motor, something that could find a place on the electric STOL aircraft espoused by CAFE’s Dr. Brien Seeley and NASA’s Dr. Mark Moore. The ability to swing a big prop slowly is crucial to noise reduction and top climb performance. Smaller versions are in use bicycles and Calley’s idea for a hybrid commuter vehicle. He noted motors that could produce 40 kW per kilogram (24 hp per pound), a seeming fantasy, but coming to a reality near us sooner than we might think.

Dr Qichao Hu from the University of Miami, showed the work he and graduate students have been doing on forward-swept propellers, an approach to producing more thrust and lower noise. Wind tunnel and computer flow dynamics (CFD) simulations are bearing out these thoughts. So far the blades swept 20 degrees forward have the highest efficiencies and stall margin of the swept configurations studied.

Calin Gologan, CEO of PC-Aero in Germany, and George Bye of Bye Aerospace (America) did a joint presentation on manned and unmanned aircraft using practical solar-electric propulsion systems. Gologan’s firm has flown Elektra One, a single-seater offered with a retractable central main wheel or a fixed tricycle gear. Variations include a two-seater tandem airplane, with one scheduled to make record flights to 75,000 feet on battery and solar power. Other models include a side-by-side trainer, and an unmanned civilian version that could be autonomous under 30,000 feet.

Calin Gologan showed picture of himself holding up 13.5 kilogram (29.7 pound) fuselage.
Calin Gologan showed picture of himself holding up 13.5 kilogram (29.7 pound) fuselage.

George Bye told about the fate of his firm’s electric Cessna 172, which did fly 25 times and had a motor controller “the size of a grapefruit.” The project is now abandoned, replaced with a probably better alternative in a tricycle-geared, 440-pound Sun Flyer trainer that will cost $10 an hour to operate. Its 80-hp motor and 250-kilowatt hour per kilogram batteries would allow an hour’s training, and its quick-swap battery packs will enable rapid turnarounds to keep students flying. He hopes to have it at Oshkosh this year, where airshow goers will have to be told when Sun Flyer is in the air, since its projected 55-dBa noise signature won’t be heard over the general din. His company also builds unmanned aerial vehicles and he discussed manually flying them at lower altitudes and allowing full autonomy, something also of interest to the next speaker.

John Langford ran a video of autonomous flight – with a human pilot just to be sure.
John Langford ran a video of autonomous flight – with a human pilot just to be sure.

John Langford closed out the pre-lunch festivities with a talk on manned unmanned aircraft – a direction he thinks UAVs are headed. His video of a modified DA-42 his company, Aurora Aviation, calls the Centaur, was a preview of what autonomous aircraft might accomplish daily in the near future. The pilot does not touch the controls from takeoff through cruise to a final perfect touchdown. The aircraft has a safety pilot, something the FAA will probably insist on for early applications of this technology.

The company’s lineup of unmanned aircraft of various sizes is part of their over two score such craft built in their 24 year history.

We’ll follow with two more reports – one for the afternoon sessions on Friday, April 25, and the second for the Saturday morning sessions. The breadth and depth of presentations was exciting and challenging, and worth noting for future reference.


Chris Visagie's Bush Eagle STOL

After completing the Bush King STOL Mission Aircraft project last year, I thought about designing and building another airplane: the Bush Eagle STOL, a nose-wheel "trainer" tail-wheel Bush STOL that converts to a Floatplane, all-in-one 2 place tandem.

I wanted a low cost STOL aircraft that was quick & simple to build, very rugged, yet easy to maintain in remote areas. Thus, the choice of engine and available parts (at very low cost) was a strong consideration. Once all the design drawings (in CAD & Solid Works), the Precision Welded Jigs and Laser cut parts where done, it took only 4 months to complete the quick build kit of the Bush Eagle STOL.

My Bush Eagle is fitted with the Bush King Performance VW2.3L 1:1.8 Re-drive Engine, PowerFin 75" ground-adjustable prop and the performance is excellent! It climbs out at +1000 ft/min and cruises nicely at 95 mph on about 3.4 gal/hr. (uses auto 93 Octane). Vx is 54 mph, Vy 69 mph, Vso is 46 mph "clean" and with 40 degrees of flaps under 32mph indicated! With two aluminum wing tanks I have 24 gal. fuel capacity on board or +5hrs flight time!

My Bush Eagle STOL is a very spacious, fun, all-in-one daily flier that I can land on paved runways, unpaved bush strips or even on a lake! Overall the Bush Eagle STOL has solid design choices and I am very happy with the result!

Location: Rowan County Airport, NC

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Zenith Introduces New STOL CH 750

Zenith Aircraft Company has combined the features and advantages of a "real" airplane with the short-field capabilities of ultralight aircraft in its new kit airplane. Based on the popular STOL CH 701 design (introduced more than 20 years ago), the recently introduced STOL CH 750 incorporates all of the 701's short-field capabilities and also maximizes cabin size and load-carrying capability allowed under the FAA's Light Sport Aircraft category. Continue reading "Zenith Introduces New STOL CH 750"