Diamond DA20-C1 Eclipse
Continental IO-240-B3B, 125 hp
The Diamond DA20-C1 Eclipse is the composite two-seat trainer. Production started in 1995 (as DA20-A1 Katana) and continued through the DA20-C1 variant with Continental IO-240-B engine at 125 horsepower. Diamond Aircraft has produced the airplane at its London, Ontario facility through various corporate transitions. The DA20 is the modern composite alternative to the Cessna 152 and Piper Tomahawk in the two-seat primary trainer market. The combination of composite construction, modern avionics, and friendly handling has made the DA20-C1 popular with university aviation programs and flight schools.
Used market prices in mid-2026 run $115,000 to $195,000 for flyable DA20-C1s depending on year, hours, and avionics. The DA20-C1 trades at meaningfully higher acquisition cost than Cessna 152s but comparable to other modern trainers like the Cirrus SR20 G1 or the LSA market. Diamond Owners forum provides type-specific support. This page covers what a DA20-C1 actually costs to own.
History
Diamond Aircraft introduced the DA20-A1 Katana in 1995 as a clean-sheet composite two-seat trainer. The original Katana used a Rotax 912 engine and was designed for the European LSA market and US primary training. Diamond introduced the DA20-C1 Eclipse in 1998 with the Continental IO-240-B engine at 125 hp, which addressed US flight school demand for an O-200/IO-240 class engine instead of the Rotax. The DA20-C1 became the volume Diamond two-seat trainer.
Production has continued for over 25 years at Diamond's London, Ontario facility. The DA20-C1 has remained largely unchanged through production with periodic interior, avionics, and minor airframe refinements. The airplane has been a popular trainer at university aviation programs, military pilot training (US Air Force Initial Flight Screening), and civilian flight schools. Diamond also produces the larger DA40 four-seat single (which we cover separately) using similar composite construction techniques.
Total DA20 / Katana production exceeds 1,800 aircraft worldwide. The fleet has remained popular with training operations and personal owners who value modern composite construction in a primary trainer. Diamond support and parts are available through Diamond Aircraft and the dealer network. The DA20-C1 is among the few modern composite two-seat trainers in continuous production for over two decades.
Variants
Diamond DA20-C1 Eclipse (1998-present)
1998-presentVolume DA20 variant. Composite airframe, Continental IO-240 engine, two-seat trainer. Used market $115,000 to $195,000. Earlier DA20-A1 Katana variants with Rotax 912 engines trade lower.
Performance
The DA20-C1 cruises at about 130 KTAS at 75% power, burning 5.5 gph of 100LL. At long-range cruise (65%), the airplane drops to about 120 KTAS on 4.8 gph. The DA20 is meaningfully faster than a Cessna 152 (about 20 knots faster on similar fuel) due to the composite airframe's reduced drag and the modern aerodynamic design. Performance makes the DA20-C1 well-suited to time-builders and cross-country training operations.
Useful load on a DA20-C1 is about 470 to 510 pounds. Full fuel (24 gallons usable) leaves about 320 to 360 pounds for two people and minimal bags. The DA20-C1 is strictly a two-seat airplane with light luggage capacity. Range with reserves is about 500 nm at long-range cruise. The airplane is best at training operations, time-building, and casual local flying with one passenger.
Powerplant
The Continental IO-240-B3B is the engine on every DA20-C1 Eclipse. Four-cylinder, horizontally opposed, fuel-injected, direct-drive piston rated at 125 hp at 2,800 RPM. Continental's published TBO is 2,000 hours (2,200 hours for serial number 1006000 and later) per Continental Service Information Letter SIL 98-9E. The IO-240 family is a refined small Continental engine with good fleet history.
Field overhauls at Gann Aviation or other reputable Continental shops run $25,000 to $34,000 in 2026 prices. The IO-240-B is one of the cheapest four-cylinder Continentals to overhaul. Parts availability is reasonable. The Hartzell two-blade or Sensenich composite ground-adjustable propeller standard on the DA20-C1 has different overhaul economics depending on prop type.
Oil consumption on a healthy IO-240-B3B runs about 0.05 to 0.15 quarts per hour. The engine reaches TBO routinely in training-fleet operations. The DA20-C1 typically operates with high utilization (300+ hours a year at training programs) and the engine handles this consistently.
Cost of ownership
Plan on $115 to $165 per flight hour at 100 hours a year of utilization, all-in. The DA20-C1's operating economics are surprisingly friendly for a modern composite. Fuel and oil run about $30 to $42 per hour at 5.5 gph and $5.50 to $7 for 100LL. Engine overhaul reserve is $13 to $17 per hour. Airframe maintenance reserve is $12 to $22 per hour, slightly higher than older metal trainers due to composite-specific maintenance.
Annual fixed costs (hangar, insurance, annual inspection) add another $50 to $90 per hour at 100 hours a year of utilization. Insurance on the DA20-C1 is moderate. Hull values are reasonable for a primary trainer. First-time owners pay $2,000 to $4,000 a year typically.
Acquisition cost in mid-2026: A DA20-C1 with mid-time engine and steam-gauge panel runs $115,000 to $160,000. A DA20-C1 with fresh engine and modern Garmin panel runs $160,000 to $195,000. Aircraft from training-fleet service trade at the low end of the range and require careful pre-buy.
Diamond Aviators online community provides type-specific support for DA20 owners. Diamond Aircraft factory support is the primary technical resource.
| Fixed cost | Range | Frequency |
|---|---|---|
| Hangar (smaller field) | $200–$450 | monthly |
| Annual inspection (composite) | $1,800–$4,000 | annual |
| Insurance (typical owner) | $2,000–$4,000 | annual |
| Database subscriptions (Garmin G500 if equipped) | $500–$800 | annual |
Estimate the cost for your situation
Defaults are pre-filled for the Diamond DA20-C1 Eclipse. Tweak fuel price, hangar, insurance, and hours to match your scenario.
Common issues & gotchas
Training-fleet history damage
highMost DA20s have flight school history. Hard-landing damage, propeller strikes, and gear scrapes are common. Pre-buy at Diamond-experienced shop essential.
Composite airframe inspection
moderateComposite construction requires specific inspection techniques. UV exposure causes gradual surface degradation. Hangar storage recommended.
Canopy and bubble cracks
moderatePlexiglass canopy is a wear item. UV exposure and thermal cycling cause cracks. Replacement runs $2,000 to $4,000 installed.
Nose gear and landing gear wear
moderateTraining utilization accumulates gear cycles quickly. Inspection and replacement intervals shorter than for private-use airframes.
IO-240 cylinder availability
lowIO-240 cylinders are available but lead times can be longer than for higher-volume engines like O-360 or IO-360.
Avionics generation transitions
moderateOlder DA20s have analog panels. Newer aircraft have Garmin G500 or G3X glass cockpits. Pre-buy avionics inspection should verify panel software currency and database support.
Who it's for
Good fit for
- ✓ Pilots wanting modern composite construction in a two-seat trainer
- ✓ Time-builders accumulating hours economically
- ✓ University aviation program operators and flight schools
- ✓ Buyers cross-shopping Cessna 152 who want a more modern airplane
- ✓ Personal owners wanting an affordable two-seat fun flyer
Less good for
- ✗ Buyers needing four-seat capability (Diamond DA40 is the natural step up)
- ✗ Pilots who specifically want fixed-pitch propeller simplicity (some DA20s have constant-speed props)
- ✗ Owners cross-shopping a Cessna 152 at meaningfully lower acquisition cost
- ✗ Buyers concerned about composite airframe long-term ownership economics
The verdict
The Diamond DA20-C1 Eclipse is the modern composite two-seat trainer. Better cruise speed than a Cessna 152 on similar fuel burn. Modern airframe construction. Diamond's London facility provides good factory support. For pilots who want a modern two-seat trainer with composite construction at moderate acquisition cost, the DA20-C1 is a defensible buy.
But the DA20-C1 is meaningfully more expensive than a Cessna 152 with similar mission utility. The composite airframe demands specific maintenance practices and hangar storage to maximize longevity. For training operations and time-builders who value the modern construction and cruise speed advantage, the DA20-C1 delivers. For budget-focused buyers, a Cessna 152 delivers similar training utility at half the acquisition cost.
Cross-shop these
- Cessna 152 →
Traditional metal two-seat trainer. Lower acquisition cost. Slower cruise. Strong fleet support.
- Cessna 150 →
Older Cessna two-seat trainer at lowest acquisition cost. Traditional metal construction.
- Diamond DA40 (IO-360-M1A) →
Diamond four-seat single. Step up to family capability with composite construction. Higher cost.
- Piper PA-28-140 Cherokee →
Piper four-seat trainer at similar acquisition cost. Traditional metal construction.
- Grumman AA-1 Yankee →
Vintage two-seat alternative. Lower acquisition cost. Smaller community.
Type club
Diamond Aviators online community →Online community for Diamond owners. Free participation. Diamond Aircraft factory support is the primary technical resource.
Frequently asked
How much does a Diamond DA20-C1 cost? +
Used market in mid-2026: $115,000 to $160,000 for a DA20-C1 with mid-time engine and steam-gauge panel, $160,000 to $195,000 for aircraft with fresh engines and modern Garmin panels.
What's the typical fuel burn for a DA20-C1? +
About 5.5 gph of 100LL at 75% cruise, 4.8 gph at long-range cruise. The Continental IO-240-B at 125 hp is among the most efficient training engines in the market.
DA20 vs Cessna 152: which should I buy? +
The DA20-C1 is meaningfully faster (about 20 knots cruise advantage), has composite construction, and is supported by Diamond factory parts. The Cessna 152 is older, slower, but has lower acquisition cost (about half the DA20's price), stronger fleet support, and deeper parts depth. Pick the DA20 for modern construction and cruise advantage. Pick the 152 for lower acquisition cost.
Is the DA20-C1 a good first airplane? +
Yes, for buyers wanting a modern two-seat trainer. The airplane handles well, has friendly visibility, and is well-supported by Diamond. The main caution is that most used examples have flight school history that requires careful pre-buy work.
What's the engine overhaul cost on a DA20-C1? +
Plan on $25,000 to $34,000 for a Continental IO-240-B3B field overhaul. Among the cheapest fuel-injected four-cylinder overhauls available.
Is the DA20-C1 still in production? +
Yes. Diamond Aircraft continues production at the London, Ontario facility. New aircraft are available with current Garmin avionics and refined interior.
Data sources
- Engine: planephd DA20-C1
- Fuel burn 65%: Plane & Pilot 2006 DA20-C1 (4.8 gph @ 65%)
- Fuel burn 75%: planephd 75% = 5.5 gph
- Oil consumption: Engine operator's manual / community typical
- Engine TBO: Continental SIL 98-9E (Aug 20 2015)
- Prop TBO: McCauley MPC-26 Rev 6 (Jun 17 2022)
- Engine overhaul: PistonAircraftLoans DA20
- Prop overhaul: Aviation Consumer 'Propeller Overhauls'
- Airframe reserve: planephd DA20-C1 hourly maintenance