The Diamond DA42 Twin Star rewrote light-twin economics with two Jet-A diesels that sip fuel — twin-engine redundancy with the fuel burn of a single, in a modern composite airframe.
Key takeaways
- Diesel twin efficiency: remarkable fuel economy for a twin.
- Modern composite airframe with a strong safety record.
- Reserve for engine/gearbox replacement (TBR), not overhaul.
About the Diamond DA42 Twin Star
The DA42 pairs two Austro (or earlier Thielert) Jet-A diesels with a composite airframe, cruising around 170 knots on a fraction of an avgas twin's fuel. It's a popular multi-engine trainer. The scheduled engine/gearbox replacement is the biggest ownership number — verify remaining life.
| Specification | Diamond DA42 Twin Star |
|---|---|
| Type | Diesel light twin |
| Engine | 2 × Austro Jet-A diesel |
| Cruise | ~170 knots |
Typical used price (2026): ~$350,000–$700,000. Condition, avionics, and engine time drive value within that range.
Is the Diamond DA42 Twin Star Right for You?
The Diamond DA42 Twin Star suits owners who want twin-engine redundancy, capability, or a platform for multi-engine training. It's a bigger commitment than a single — two engines to maintain and insure, and a multi-engine rating — so weigh the capability against the real operating cost.
Ownership & Operating Costs
- Fuel: two engines burn roughly double a single.
- Insurance: higher than a single; sensitive to multi-engine time.
- Two engine reserves: reserve per hour toward each overhaul.
- Maintenance: more systems and two powerplants than a single.
For a full framework across models, see our aircraft ownership cost guide.
What to Check When Buying
Evaluate both engines' times and compressions, the gear and any pressurization, damage history, and complete logs — and get a bindable multi-engine insurance quote before you commit. Use a twin-experienced shop.
Financing a Diamond DA42 Twin Star
A Diamond DA42 Twin Star finances as a piston twin — around 20% down over 15–20 years — with lenders weighing two engines and insurance priced on your multi-engine time and rating. Jaken Aviation is a brokerage, not a lender — we shop your loan across a national network of aviation lenders.
Prices, specifications, and financing figures are illustrative for the 2026 market and are not offers of credit. Jaken Aviation is a licensed aircraft financing brokerage — a division of Jaken Finance Group — and does not make loan decisions. All financing is subject to lender approval.
Frequently Asked Questions
Is a twin like the Diamond DA42 Twin Star worth the extra cost?
It depends on your mission. A twin adds redundancy and capability but roughly doubles fuel and adds a second engine to maintain and insure. Budget the full operating picture.
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