V-speeds, cruise performance, fuel, and weights, digitized from the POH for planning and study.
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In the FlightDecide app since 2026-07-16. Not yet reviewed against the handbook. 0 of 6 tables from the handbook. Anything marked “Not yet verified against the handbook” comes from FlightDecide's earlier library and hasn't been checked against the printed page.
Diamond DA42 Twin Star preflight numbers at a glance: max gross weight 3935 lb, typical useful load 1279 lb, 50 gal usable fuel, cruise up to about 190 KTAS (reference figure at 16,000 ft, standard day). Figures below come from the FlightDecide curated aircraft library. The performance tables for this type have not yet been re-checked against the handbook, so treat them as estimates. Use them for planning and study, and confirm against the POH for your specific serial number before flight.
Not yet verified against the handbook
| Engine | 2x Austro AE300 (168 HP diesel each) |
| Propeller | MT-Propeller MTV-6-A/187-129 (2x) |
| Max gross weight | 3935 lb |
| Empty weight (typical) | 2656 lb |
| Useful load (typical) | 1279 lb |
| Usable fuel | 50 gal |
| Service ceiling | 18,000 ft |
Not yet verified against the handbook
Knots indicated (KIAS) unless the POH states otherwise. Speeds vary by model year and serial; the placarded speeds and your POH govern.
| Speed | Value | Meaning |
|---|---|---|
| VS0 | 62 kt | Stall, landing configuration |
| VS1 | 68 kt | Stall, clean configuration |
| VX | 80 kt | Best angle of climb |
| VY | 89 kt | Best rate of climb |
| VXSE | 80 kt | Best angle of climb, single engine |
| VYSE | 85 kt | Best rate of climb, single engine |
| VFE | 113 kt | Max flaps extended |
| VNO | 151 kt | Max structural cruising |
| VNE | 188 kt | Never exceed |
| VMC | 68 kt | Min control, one engine inoperative |
| Best glide | 90 kt | Best glide speed |
Not yet verified against the handbook
Source not verified: these rows are the library's earlier transcription, and the pages they cite have not been checked against the handbook. True airspeed and fuel flow depend on altitude, power setting, temperature and leaning technique.
Source: 5.3.10
| Pressure altitude | % power | TAS | GPH |
|---|---|---|---|
| 2,000 ft | 60 | 139 | 10.3 |
| 2,000 ft | 75 | 153 | 13.2 |
| 2,000 ft | 92 | 166 | 16.6 |
| 4,000 ft | 60 | 142 | 10.3 |
| 4,000 ft | 75 | 156 | 13.2 |
| 4,000 ft | 92 | 169 | 16.6 |
| 6,000 ft | 60 | 144 | 10.3 |
| 6,000 ft | 75 | 159 | 13.2 |
| 6,000 ft | 92 | 173 | 16.6 |
| 8,000 ft | 60 | 147 | 10.3 |
| 8,000 ft | 75 | 162 | 13.2 |
| 8,000 ft | 92 | 176 | 16.6 |
| 10,000 ft | 60 | 150 | 10.3 |
| 10,000 ft | 75 | 165 | 13.2 |
| 10,000 ft | 92 | 179 | 16.6 |
| 12,000 ft | 60 | 152 | 10.3 |
| 12,000 ft | 75 | 168 | 13.2 |
| 12,000 ft | 92 | 183 | 16.6 |
| 16,000 ft | 60 | 157 | 10.3 |
| 16,000 ft | 75 | 175 | 13.2 |
| 16,000 ft | 92 | 190 | 16.8 |
Not yet verified against the handbook
Estimated figures at 3935 lb, 0 ft pressure altitude, 15 °C. These have not yet been re-checked against the handbook. Real-world technique, wind, surface, and density altitude move these substantially, so apply your own margin (many pilots use 1.5× the book number) and run the numbers for the actual conditions.
| Estimated figure | Distance |
|---|---|
| Takeoff ground roll | 1480 ft |
| Takeoff over a 50 ft obstacle | 2145 ft |
| Landing ground roll | 560 ft |
| Landing over a 50 ft obstacle | 950 ft |
| Rate of climb | 1300 fpm |
See how density altitude stretches these distances on a hot day.
Common QuestionsPer the library's cruise table, not yet verified against the handbook, up to about 190 KTAS at 16,000 ft on a standard day, burning roughly 16.8 GPH at that setting. Typical everyday cruise settings run slower and leaner; see the table above.
50 gallons usable. At a high-cruise burn of 16.8 GPH that is roughly 3.0 hours to dry tanks. Plan with reserves, never to zero.
About 1279 lb for a typically equipped example (3935 lb max gross minus a typical empty weight of 2656 lb). Your aircraft's actual empty weight and CG come from its own weight-and-balance records. Always use those, not type averages.
VNE (never exceed) is 188 kt and VNO (max structural cruising) is 151 kt. Full V-speed table above; verify against the POH for your serial.
Check today's wind against your personal crosswind maximum.
See what heat and elevation do to these takeoff and climb numbers.
Fold these numbers into a structured preflight decision.
FlightDecide ships this aircraft as a built-in profile: it computes your fuel, weight and balance, and takeoff/landing performance for the actual conditions, scores 8 risk categories against your personal minimums, and explains the result in plain language.
Get FlightDecide on the App StoreReference data for planning and study: approximate, and not a substitute for the FAA-approved AFM/POH for your specific aircraft, an official weather briefing, or your judgment as pilot in command (14 CFR 91.3). Source: Diamond DA42 Twin Star Pilot's Operating Handbook, Diamond Aircraft Industries | FD-215: cruise re-digitized on POH axis (recommended_lean, high conf), fuel total both-engines for twins. Data synced from the FlightDecide aircraft library on 2026-09-28.