Berkut 360

The Berkut 360 is a two-place tandem canard pusher designed by Dave H. Ronneberg, originally under the Experimental Aviation, Inc. banner (Ronneberg and Donald S. Murphy partnership, 1989-1992). It is a refined, molded-composite evolution of the rutan-long-ez, the signature Burt Rutan homebuilt canard. The prototype flew in 1989 and kits began shipping in 1991-1992. Where the Long-EZ is hand-laid foam-and-glass with fixed main gear, the Berkut uses pre-molded carbon-fiber/fiberglass fuselage halves, strakes, and wing spar, plus retractable main landing gear, dual bubble canopies, and a cleaner exterior. The result is one of the fastest normally-aspirated two-place piston homebuilts ever produced, capable of 200+ ktas on a Lycoming IO-360.

Production was always small: roughly 75 kits sold through Experimental Aviation Inc. and various successor entities, with approximately 20-31 aircraft actually completed and flying. The type is considered a builder's airplane, prized by long-distance speed chasers and canard aficionados. The fleet is tiny, tightly-knit (active through the Canard Zone forum and EZ Hangar community), and each example is essentially bespoke. A later derivative, the Berkut 540, swaps the IO-360 for the six-cylinder Lycoming IO-540, pushing power to 260-330 hp and cruise speeds into the 220+ ktas range (see Variants).

The 360 and 540 share the same basic molded airframe; the 540 adds a longer engine mount, revised cowling, relocated battery, and firewall-forward changes to accommodate the six-cylinder engine and its additional weight.

Book cruise numbers for the IO-360 Berkut are around 191 ktas at 75% / 8,000 ft burning ~10.3 gph, with economy cruise near 187 ktas at 7.7 gph. The canard configuration and slippery molded airframe mean the Berkut is remarkably efficient: at any given horsepower it is 25-40 knots faster than comparable Long-EZ examples. Climb is strong (reported 2,000 fpm initial) because the aircraft is lightly loaded for its power. Service ceiling around 32,000 ft is academic without oxygen and turbocharging, but the airplane breathes well at altitude.

Real-world caveats: takeoff rolls are long compared to conventional GA because the high-aspect-ratio canard stalls before the main wing, preventing the nose from rotating prematurely; expect 1,200-1,500 ft of ground roll at gross. Landing distances are similarly long — the canard cannot be "flared" in the traditional sense and approach speeds are 85-90 KIAS, with minimal float, so pattern discipline and 4,000+ ft of runway are wise. The Berkut does not stall in the conventional sense: the canard loses lift first, causing a gentle pitch-down with the main wing still flying, which is the signature Rutan safety feature.

With ~890 lb useful load and 52 gal (312 lb) of fuel, the Berkut 360 has interesting payload-range tradeoffs for a two-place airplane:

• Full fuel + 2 pax (340 lb): Leaves ~240 lb for baggage and pilot-surplus; two 170-lb adults fit comfortably with 50 lb baggage. Range ~1,000 nm at economy cruise — a genuine coast-to-coast machine in two legs.
• Full fuel solo: 890 - 312 = 578 lb for pilot and gear; the airplane will carry essentially any legal solo load and go the full 1,000+ nm.
• Max payload, reduced fuel: With two heavy occupants (200 lb each) and 100 lb baggage, fuel must be cut to ~290 lb (48 gal) — still 900+ nm of range. The Berkut is rarely payload-limited.
• Baggage volume: The real constraint is physical space, not weight. Strake bays and the small tandem baggage area hold roughly 2-3 soft duffels. Hard cases don't fit well.

The Berkut is one of the few two-place homebuilts where full fuel + full seats + reasonable baggage all coexist, making it a legitimate long-range traveler rather than a weekend toy.

• Cross-country (9/10): This is the Berkut's raison d'être. 190+ ktas true at modest fuel burn, 1,000+ nm range, and all-day comfort in the tandem cockpit make it one of the fastest practical piston travelers under $250k. See cross-country.
• Business travel (7/10): Two seats limit it to solo or pilot+passenger business runs. Experimental status also bars commercial operations entirely, so this is strictly private travel.
• Local fun flying (7/10): Fast, slippery, and a head-turner on any ramp. Great "Sunday morning blast" airplane, but it is not a trainer and not cheap to operate just for sightseeing.
• Aerobatics (2/10): Not approved for aerobatic maneuvers. The canard is deliberately stall-limited and G-limits are modest. Some owners do mild aileron rolls but this is not its mission.
• Flight training (1/10): Tandem two-place experimental with unusual handling, retractable gear, and 90-knot approaches. Unsuitable for primary training and a poor choice for transition training without type-specific mentorship.
• Backcountry (1/10): Pusher prop, low ground clearance, retractable gear, and 1,500 ft landing rolls at gross. Absolutely not.
• Surveying (2/10): Pusher configuration gives a clean forward/down view, but the airplane is too fast and fuel-thirsty at low altitude for pipeline/photo work.
• Cargo (2/10): Tandem seating and small strakes/baggage bays limit payload volume. Useful load of ~890 lb is decent, but physical space is limited.

Because Berkuts are experimental amateur-built, owners can install any avionics without FAA field approval. The popular choices are experimental EFIS glass: Dynon SkyView HDX or Garmin G3X Touch, typically paired with a Garmin GTN 650/750 or GPS 175 for IFR-legal GPS, a GTR 200/225 or GTX 327/335 transponder, and a PS Engineering audio panel. Autopilot integration via Garmin GMC 507 or TruTrak is common for long cross-country missions. A fully-glass IFR panel runs $25,000-$45,000 installed (by builder labor). Older Berkuts still flying steam gauges are rare and due for upgrade. See avionics-pricing.

STCs do not apply to experimental aircraft — all modifications are at the builder/owner's discretion under the amateur-built airworthiness certificate. Common modifications on Berkuts include:

• IO-360 to IO-540 conversion (effectively a re-build — firewall forward, cowling, engine mount, CG re-balance)
• Electroair or LightSpeed electronic ignition (typically 5-8% fuel savings)
• MT or Catto composite propellers replacing wooden originals
• Winglet tip tank additions for extended range (similar to Long-EZ tip tanks)
• Vortex generators on the main wing (controversial; some claim improved low-speed handling)
• Landing light and navigation light LED upgrades

Experimental status allows the owner to perform their own maintenance and sign off the condition inspection (if they hold the repairman certificate as builder) or have any A&P do it (if not). The challenge is that very few A&Ps have any Berkut experience. Expected realities:

• Parts: Factory kit support is effectively gone; Experimental Aviation Inc. no longer produces new kits at scale. Renaissance Composites has attempted to restart production but supply is intermittent. Consumable parts (brakes, tires, hardware) are standard Cleveland/aircraft-grade and easy to source. Structural and cosmetic composite parts require custom fabrication.
• Engine: Lycoming IO-360 parts and overhaul shops are plentiful (~$32,000 field overhaul, 2,000 hr TBO). IO-540 overhaul runs $40,000-$55,000.
• Annual condition inspection: $1,200-$2,500 at an experimental-friendly shop; owner-performed if repairman certificate applies.
• Realistic annual ownership cost (hangar, insurance, condition inspection, engine reserve, avionics database, fuel at 50 hr/yr): $8,000-$12,000 for an IO-360 Berkut.
• Expensive items: Gear retract actuator overhaul, canopy replacement, composite repairs, propeller overhaul.

See maintenance-ecosystem for general experimental support infrastructure.

Berkut valuation is unusually dispersed because no two airframes are alike. Observed market range is roughly $45,000 (unfinished project or needs-work) to $250,000+ (pristine 540 with glass panel). Typical flying IO-360 Berkut trades around $120,000-$150,000. Key drivers:

• Engine time and configuration: IO-540 commands a $40,000-$60,000 premium over IO-360. Mid-time engines depreciate steeply because experimental overhaul is owner-responsibility and reinstallation labor is significant.
• Panel: Modern dual-screen glass IFR panel adds $30,000-$45,000. Steam-gauge Berkuts are discounted accordingly.
• Builder reputation: Berkuts built by known quality builders (mentioned on Canard Zone) trade at a clear premium. "Orphan" builds with unknown provenance are steeply discounted.
• Paint and finish quality: Composite refinish is expensive ($15,000-$25,000). A well-painted airframe holds value.
• Retract system condition: Recent gear actuator overhaul and logbook evidence of proper rigging add meaningful value.

See valuation-methodology for general formulas.

Experimental aircraft are not subject to FAA Airworthiness Directives, but Berkuts share several known issues with the broader canard fleet:

• Retractable main gear: Unique to the Berkut and somewhat trouble-prone. Actuator motors, microswitches, and uplocks are the usual failure points. Several NTSB incidents involve gear-up landings after retract system failures.
• Canopy latching: Dual bubble canopies have had in-flight opening incidents; owners typically add secondary latches.
• Nose gear (retractable steerable): Long-EZ/Berkut family nose gears have chronic retract mechanism issues; parked-nose-down is standard practice when unattended.
• Cooling: Pusher canards are notoriously hard to cool; CHT management on climb is a builder-specific ongoing concern.
• Weight creep: Many Berkuts end up 100-200 lb heavier than the published empty weight due to paint, avionics, and builder additions, eating useful load.
• Carbon fiber repair: Damage to the molded carbon structures requires specialist composite repair, not general shop work.

Pre-buy red flags: gear retract logbooks, any history of gear-up or hard landings, CHT records, builder documentation completeness (many Berkuts have passed through 3-4 owners and paperwork is often incomplete), and whether the current engine matches the original firewall-forward design.

Insurance is a real challenge. The Berkut combines multiple underwriting red flags: experimental amateur-built, retractable gear, high-performance, tiny fleet with no actuarial data, and demanding handling. Hull coverage is hard to obtain above agreed-value thresholds of $125,000-$150,000 without extensive type time, and many underwriters refuse coverage entirely. Expect:

• Annual hull+liability for a $150k Berkut: $4,000-$6,000 with at least 500 hours retract time and an IPC
• Owners with no retract time: coverage may be unavailable or require 10-25 hours dual with a Berkut-familiar mentor pilot
• Liability-only is cheaper (~$1,500-$2,500) and commonly chosen by lower-time owners

See insurance-underwriting for experimental category details.