Range Map
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Payload vs. Range
Fuel on board
Cargo
nm
Range
Trip Preview
Name a destination in the map header above and this becomes your trip: time en route, what you burn, what it costs, and whether you get there without stopping — at the load you have set.
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Over max payload by . At this load it cannot lift a single occupant. Please adjust your payload inputs.
We do not have a cruise speed on file for this aircraft, so there is no honest time or cost to give you for this leg.
En route
Fuel burned
Direct cost
Fuel cost
Tanks run dry about past before at this burn.
Mission Profile
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Estimated Ownership Costs
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About the Onex
Overview
The Sonex Onex is a single-seat, folding-wing experimental amateur-built (E-AB) sport aircraft from Sonex Aircraft of Oshkosh, Wisconsin, first flown in 2010 and sold today as a builder’s kit. It is an all-aluminum low-wing monoplane powered by the 80 hp AeroVee 2180, a Volkswagen-derived flat-four. It cruises around 135 knots on roughly 4 gallons per hour and is stressed for light aerobatics. Its defining trick is a manually folding wing that stows the aircraft to about 7 by 8 feet, letting an owner keep it in a single-car garage or on a trailer instead of paying for a hangar.
For a solo pilot the Onex competes on cost of ownership rather than capability. Against the two-seat Sonex it gives up a passenger and some range but shares the same engine and build system while still trailering home to a garage; against a used certified single such as a Cessna 150 it concedes the second seat, IFR capability and a type certificate, but flies on a fraction of the fuel and skips the hangar bill. The decision against the Onex usually comes down to the traits that define it: one seat, an owner-built airframe whose quality depends on its builder, and VW-conversion power that rewards pilots who value economy and packability over payload.
Key Features for GA Buyers
- Folding wing for garage storage. The wings fold manually against the fuselage, cutting the footprint to roughly 7 by 8 feet so the aircraft can live in a single-car garage or ride a trailer, eliminating hangar rent.
- VW-conversion economy. The 80 hp AeroVee 2180 burns under 4 gallons per hour and accepts either avgas or automotive mogas, holding the Onex’s direct operating cost to about $44 per hour.
- Aerobatic capability. Stressed to +6/-3 g, the Onex is cleared for light aerobatics, uncommon in a single-seat design at this price.
- Sport Pilot eligible. A clean stall near 43 knots and a 950 lb gross weight let it be flown on a Sport Pilot certificate, keeping medical and training requirements minimal.
Trade-offs
- One seat. The Onex carries only the pilot; there is no way to share the flying or bring a passenger.
- Owner-built quality varies. As an amateur-built kit, its finish, rigging and systems reflect the builder; a thorough pre-buy and a look at the builder’s log matter more than with a factory aircraft.
- No published engine TBO. The VW-derived AeroVee carries no certified time between overhauls, so overhaul reserve is a planning judgment rather than a manufacturer figure.
- Modest useful load. With 350 lb of useful load and 15 gallons of fuel, a full-fuel Onex leaves limited margin for a heavier pilot plus baggage.
See Also
- Sonex – the two-seat sibling on the same engine and build system. Compare
- Waiex – Y-tail two-seat variant of the Sonex. Compare
- Xenos – two-seat motorglider on the same airframe family. Compare
- Sonerai II – Monnett’s VW-powered tandem racer, the line’s ancestor. Compare
Technical Specifications
Dimensions & Weights
- Height
- 4 ft
- Length
- 16 ft
- Parking area (ft²2)
- 659 ft²
- Max Takeoff Weight
- Source: manufacturer figure 950 lbs
- Max Landing Weight
- 950 lbs
- Useful Load
- Source: manufacturer figure 350 lbs
- Fuel Capacity
- 15 gal
Performance
- Cruise Speed
- Source: manufacturer figure 135 KTAS
- Never-Exceed (VNE)
- Source: manufacturer figure 188 KIAS
- Stall, Clean (VS1)
- Source: manufacturer figure 43 KIAS
- Range
- 465 NM
- Service Ceiling
- 16,000 ft
- Rate of Climb
- 900 fpm
Engine
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Sources
Where the figures on this page come from. Onex specifications are traced to published references; estimated values are flagged inline next to the figure.
Similar to the Onex
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