Planes have been around for more than 100 years. The first modern helicopter first flew over 80 years ago. For the last 60 years engineers have tried to combine the advantages of both but currently only the V-22 Osprey is in production. Elytron will be the first to deliver aircrafts that can take off and land like a helicopter but fly with fixed wings at speeds
unattainable by helicopters all with greatly reduced complexity and cost compared to any existing tilt or rotary wing aircraft. After 10 years of research into convertiplane wing and lift design, a box wing design with central prop-rotors was chosen providing aerodynamically clean vectored thrust.

HISTORY

history
For the past 60 years, engineers have tried to combine the advantages of airplanes and helicopters, but currently the Boeing V-22 Osprey is the sole realization to be in production. The Elytron family of aircraft is designed to provide the vertical take-off and landing capability of helicopters combined with the speed and efficiency advantages of fixed wing aircraft. Elytron’s solution provides greater safety, speed, and simplicity of operation over any existing class of vertical take-off aircraft which makes it ideally suited for various uses, such as emergency medical services,
search and rescue, air taxi, and oil exploration. The concept for the Elytron design has evolved over a 10-year period during which Elytron Aircraft LLC experimented with several quarter-scale convertiplanes, as well as full-size airframe modeling, extended flight simulations, and CFD simulations. The popular Verticopter flying-wing design with in-wing propulsion was the most successful of these prototypes but still had aerodynamic limitations. In 2012, Elytron Aircraft LLC invented a new and optimized wing configuration that addressed all of the earlier design shortcomings.

DESIGN

Elytron Aircraft is SAFE Elytron Aircraft is FAST Elytron Aircraft is SIMPLE (click to enlarge)
The Elytron design combines three sets of wings: one pair of rotary wings called "proprotors", mounted on a single tilt-wing in central position, and two pairs of fixed wings. The fixed wings are split into a forward pair and an aft pair that are joined by winglets, which make use of the joined-wing concept. By splitting the wings apart, the design eliminates any interference with the thrust of the proprotors. The main wings have a high aspect ratio, are braced and can be built very light which reduces drag. Since the front and rear wings are joined together by winglets, they enclose the proprotors eliminating the risk of rotor strikes. The plane has superior glide ratios and low stall speeds because of this low wing loading design, and also displays excellent Short Take-off and Landing (STOL) capabilities.

Because the proprotors are tilted forward during normal flight, the Elytron design does not suffer the performance penalty that helicopters do with the retreating blade. Therefore, Elytron aircraft will be capable of achieving air speeds two to three times those of equivalently powered helicopters. The airframe has also been optimized for low drag at the higher airspeeds made possible by its tilt wing. Fixed wings planes are also far more fuel efficient than rotary wing aircraft, reducing operational costs and increasing range. The combination of the speed of a fixed wing plane and the vertical take-off of a helicopter will allow for applications such as air taxi from city center to city center.
The Elytron mechanism for controlling the plane during vertical flight will have far fewer parts than helicopter swash plates. The helicopter's complex rotor hub with the cyclic, collective mechanism is replaced with a single continuous wing that rotates 100 degrees and embeds four control surfaces that are controlled with regular linear actuators. The power train has two 90-degree gear boxes and a reduction drive. Elytron’s design has no complex hub but instead distributes the parts across the tilt wing making them lighter and easier to inspect and maintain. All of the tilt wing actuators have redundant control. In the case of engine failure, the airframe's superior glide ratio will eliminate the need for autorotation, which is a requirement in any helicopter. The plane will also offer a “zero-zero” ballistic parachute as an additional emergency safety feature.

Using a small budget and fast prototyping techniques with carbon composites, Elytron has built a 2-seater demonstrator aircraft which serves as a technology showcase. The next step for Elytron is to start commercial applications which include a 7-seater class of aircraft able to support applications, such as emergency medical services. Elytron's patented designs will incorporate a host of additional safety features, such as run dry gear boxes, full time health and usage monitoring, FADEC engine control, and envelope protection

COMPANY

Gregory Bruell

Gregory Bruell - CEO & Co-Founder at Elytron Aircraft

Greg Bruell spent 26 years in the software industry as a programmer, technical leader and executive. He has always had a passion for VTOL and realized that the time was ripe to build a convertiplane. After building a quad-copter with his son he also had the epiphany that the state of the hardware and software industry today has advanced to the point that fly-by-wire control can be done economically enabling flexibility in convertiplane design in a way never before possible. No stranger to the startup process, having participated in several venture capital backed companies, he researched the state of the VTOL industry, teaming with Oliver to build a plane.
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Oliver Garrow

Oliver Garrow - CTO & Co-Founder at Elytron Aircraft

Oliver Garrow has spent the last decade addressing the challenge of conceiving the optimum convertiplane, and, since the first napkins drawings in 2002, has invented, engineered and patented 4 flying proof-of-concepts, called Verticopter #1,2,3,4, each new generation improving on the previous one.
By using real-world flying test beds with electric UAVs and accurate computer simulations, this relentless effort has led to the conception of the optimum aircraft configuration, now re-branded Elytron, which is now suitable for commercial developments.
Oliver has an extensive experience in electrical engineering, semiconductors, software engineering, embedded systems and aircraft systems design. Not yet a real-world pilot, he has however "logged" hundreds of hours of simulator flight and testing time.
Oliver hold multiple degrees in engineering, such as a BSEE and a MSCS in electronics, software, computer sciences, electromechanics and control automation, from 2 leading European universities.
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In 2013, Garrow Aircraft formed Team Elytron by enrolling help from top aerospace professionals and turned its R&D on the patented STOVL Verticopter® work into a commercial aircraft family called Elytron.
The designers of Elytron have proved their concept through extended flight testing of scaled UAVs, launched from runways
at Moffett Field, CA. This testing included all CTOL, STOVL and VTOL envelops, as well as full-size airframe modeling and CFD simulations.
Team Elytron has conducted over 10 years of research in the challenging field of efficient convertiplane flight, has simulated various airframe configurations through detailed

PRESS

Elytron 2S: The out-of-the-box tiltrotor concept

By David Szondy
Gizmag - July 23, 2014

Some people are never satisfied. You give them a plane, and they say it can’t hover. You give them a helicopter, and they say it can’t fly very high or fast. Looking to combine the advantages of both fixed-wing aircraft and helicopters, Elytron Aircraft LLC of Mountain View, California is developing the Elytron 2S, a small tiltrotor aircraft that uses a box wing configuration and is aimed at the civilian market.
Airplanes and helicopters do well in their respective aeronautical niches. Airplanes can fly high, fast, far, and carry heavy loads, while helicopters can hover, fly backwards, land and take off vertically, and maneuver in very tight spaces. The tricky thing is when jobs arise where requirements overlap; like an airplane that can land vertically, or a helicopter than can fly at high altitude.
Though there have been some aggressive development projects in recent years, such as the Bell V-280, the AugustaWestland Project Zero and AW609, the only operational manned, prop-driven aircraft that manages this sort of hybrid flight is the V-22 Osprey tiltrotor aircraft.
In service with the US Marine Corps and the air forces of the US, Japan and Israel, the military tiltrotor spent many years in controversial development and, to this day, no civilian version has taken off. This is unfortunate because early visions of tiltrotor aircraft saw them employed as air taxis, short haul transports, and in other civilian applications.
The Elytron 2S is a new take on tiltrotor configuration that incorporates an unconventional wing design to create a hybrid aircraft with greater performance – especially in the difficult transition between vertical and horizontal flight. One of a family of aircraft developed by the Elytron company over the past decade, the 2S is intended to combine the features of a helicopter and a fixed-wing aircraft, with the company seeing applications for emergency medical services, search and rescue, air taxis, and oil exploration.
Comparing the 2S to the Osprey, the most obvious difference is its wing configuration, known as Prandtl's box wing design. It looks exotic and futuristic, but it’s actually a variation on a wing concept that dates back to the earliest days of aviation when it was used by the pioneer flyer Louis Bleriot in 1906. It has also been used more recently by Lockheed Martin for one of its concept jets.
2S’s design uses two pairs of wings. One pair is set forward on the fuselage and is swept back.
A second pair is set on top of the tail and swept forward. The tips of the fore and aft wings are linked by winglets, forming a skewed box. With this layout the forces are distributed through the box structure, making it stronger and lighter. It also provides a high aspect ratio for greater lift of about 15 percent over conventional wings.
This results in greater fuel efficiency and less weight. In addition, the box wing is more stable, has better glide ratios and is less prone to stalling. In all, this makes Prandtl's box wing very suitable for short take-off and landing craft. The stall factor is particularly important because it helps keep the 2S in the air during the vertical to horizontal flight transition.
So far, this is unusual, but not unprecedented. According to Elytron, the novel bit about the 2S is the extra pair of rotating wings mounted amidships, which contain the motors and props. The rotary wings, called "proprotors," are powered by two 90-degree gearboxes and are mounted on a single, centrally-mounted tilt wing that travels through 100 degrees and has four control surfaces.
Elytron says that this arrangement inside the box wing obviates interference with the proprotors’ thrust, while the winglets protect against rotor strikes. Because the proprotors can drop to the horizontal for forward flight, the blades don’t have the disadvantage of helicopter rotors where the retreating side of the rotors slows the craft and introduces unwanted torque. The design of the proprotors is much less complicated than a helicopter rotor with no need to angle or feather the rotors, so the linkages are simpler and their fewer parts are spread out through the wing.
According to Elytron, the result of all this is low drag at high speed in a craft that can fly two to three times the speed of an equivalent helicopter and, if the V-22 is an example, it will have a higher operating ceiling. It’s also safer because its glide ratio means that the rotors don’t need to autorotate during an emergency landing. If that doesn't work. Elytron says it will install a ballistic parachute.
The Elytron 2S is a two-seater technology demonstrator built using fast prototyping with carbon composite materials. The company says that it plans to install a 450 bhp turbocharged race engine in the 2S with the goal of conducting flight tests next year. If successful, the next phase will include building a seven-seater version for commercial use. In the meantime, the 2S is on display at the Oshkosh Airshow through August 3.



The biplane is back! Bizarre dual winged design combines plane and helicopter - and could mean personal aircraft that can land anywhere

By Mark Prigg
MailOnline - July 24, 2014

- Craft has vertical take-off and landing capability of helicopters combined with the speed and efficiency advantages of fixed wing aircraft
- Could allow airlines to fly directly into the heart of cities

It is the private plane that could land and take off from anywhere.
With its square wing, it may look uncannily like a biplane - but in fact this in a combined plane and tilt rotor helicopter.
Called the Elytron, it could change the way private planes operate - and even allow airlines to fly directly into the heart of cities.
'The Elytron family of aircraft is designed to provide the vertical take-off and landing capability of helicopters combined with the speed and efficiency advantages of fixed wing aircraft,' the firm says.
'Elytron’s solution provides greater safety, speed, and simplicity of operation over any existing class of vertical take-off aircraft which makes it ideally suited for various uses, such as emergency medical services, search and rescue, air taxi, and oil exploration.'
'The combination of the speed of a fixed wing plane and the
vertical take-off of a helicopter will allow for applications such as air taxi from city center to city center.'
The Elytron design combines three sets of wings: one pair of rotary wings called 'proprotors', mounted on a single tilt-wing in central position, and two pairs of fixed wings.
The fixed wings are split into a forward pair and an aft pair that are joined by winglets, which make use of the joined-wing concept.
By splitting the wings apart, the design eliminates any interference with the thrust of the proprotors.
'Because the proprotors are tilted forward during normal flight, the Elytron design does not suffer the performance penalty that helicopters do with the retreating blade,' the firm says.
'Therefore, Elytron aircraft will be capable of achieving airspeeds two to three times those of equivalently powered helicopters.'
Elytron has built a 2-seater demonstrator aircraft which serves as a technology showcase.
The next step for Elytron is to start commercial applications which include a 7-seater class of aircraft able to support applications, such as emergency medical services.



Elytron Aircraft, a Fixed-wing, Helicopter Crossover

By Marino Boric
EAA - August 2, 2014

Elytron Aircraft is showcasing an unusual proposal for a crossover of fixed-wing and rotorcraft aircraft during EAA AirVenture Oshkosh 2014. The two-seat demonstrator, incorporating an all-carbon composite airframe, should be capable of STOL and VTOL operations—depending on loaded weight—and even hovering like a helicopter.
The Elytron design combines three sets of wings: one pair of rotary wings called “prop-rotors,” attached to a single tilt-wing mounted in a central-fuselage position, and two pairs of fixed wings. The fixed wings are split into a forward pair and an aft pair, and are joined by winglets, making use of the joined-wing concept. By splitting the wings apart, the design eliminates interference with the prop-rotors’ thrust.
According to the company, the airplane will have a high glide ratio and low stall speed, together with excellent short takeoff and landing (STOL) capabilities. The prop-rotors and their wing can rotate 100 degrees and mounts four control surfaces. Elytron Aircraft says similar configurations will be capable of achieving airspeeds two to three times those of equivalently powered helicopters.
The demonstrator currently lacks a powerplant, but the company said it soon will be powered by a 450-hp turbocharged race engine, and flight testing will start in 2015.
Elytron Aircraft’s exhibit is in the Innovation Center. Learn more about the company at its website, Elytron.aero.



What slump? Oshkosh gathering shows GA on an upswing

CompositesWorld - August 4, 2014

EAA's AirVenture 2014 was a solid success, and offered lots of composite applications.

Another, rather unusual hybrid fixed-wing/rotorcraft was displayed by Elytron Aircraft (Mountain View, Calif.). The two-seat demonstrator, incorporating an all-carbon composite airframe, combines three sets of wings: one pair of rotary wings called “prop-rotors,” attached to a single tilt-wing mounted in a central-fuselage position, and two pairs of fixed wings. The fixed wings, joined
together by winglets, form a forward pair and an aft pair, and resemble a large box or frame around the fuselage.
The wing design eliminates interference with the prop-rotors’ thrust, says the company. Because the proprotors are tilted forward during normal flight, the Elytron design does not suffer the performance penalty that helicopters do with the retreating blade. Therefore, Elytron aircraft will be capable of achieving air speeds two to three times those of equivalently powered helicopters. Elytron said that flight testing will begin in 2015.

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