The 680 was certified to CAR 3 Amendment 12 on December 14, 1955. This model was created by changing the 560A model by increasing the gross weight to 7000 pounds, changing the engines to a Lycoming GSO480-A1A5 (340HP) and increasing the fuel capacity to 223 gallons. The 680 model was also known as the “Couser” Commander for its notable speed relative to its gross weight at the time.
Specification Performance Kit Finder| Span - 680 | 44.05′ | 13.42m |
| Length | 35.10′ | 10.69m |
| Height | 14.5′ | 4.41m |
| Tread | 12.91′ | 3.93m |
| Cabin Entry Door | 3. 58’ x 2.33’ | 1.09 x 0.71m |
| Cabin Height (Inside Interior) | 4.41′ | 1.34m |
| Cabin Length | 10.62′ | 3.23m |
| Cabin Width (Inside Interior) | 4.33′ | 1.31m |
| Cabin Volume | 177 ft³ | 53.94m³ |
| Baggage compartment height | 3.41′ | 1.03m |
| Baggage compartment width | 3.91′ | 1.19m |
| Baggage compartment length | 2.58′ | 0.78m |
| Baggage compartment volume | 32 ft³ | 9.75 m³ |
| Baggage door height | 1.91′ | 0.58m |
| Baggage door width | 1.58′ | 0.48m |
| Baggage compartment load limit | 350 lbs | 159 kg |
HC-83x20-2A/9333C (3 blade)
Lycoming GSO-480-A1A-6/B1A-6
| Max Ramp Weight: | 7000 lbs/ 3175 kg |
| Take-off Weight: | 7000 lbs/ 3175 kg |
| Landing Weight: | xxx lbs/ xxx kg |
| Standard Empty Weight: | 4420 lbs/ 2005 kg |
| Useful Load: | 2580 lbs/ 1170 kg |
| Zero Fuel Weight: | xxx lbs/ xxx kg |
| Baggage: | 350 lbs/ 159 kg |
| Cruise Speed (@ 70% power @ 10,000 Ft) | 210 MPH / 182 KTS |
| Maximum Cruise | |
| Normal Cruise Speed | |
| Twin Engine Best Rate of Climb Speed (CAS): | xxx mph/xxx kts |
| Twin Engine Best Angle of Climb Speed (CAS): | xxx mph/xxx kts |
| Single Engine Best Rate of Climb Speed (CAS): | xxx mph/xxx kts |
| Single Engine Best Angle of Climb Speed (CAS): | xxx mph/xxx kts |
| Best rate of Climb Speed | 120 MPH / 104 KTS |
| Minimum Control Speed (CAS): | 85 mph/74 kts |
| Stall Speed, Clean (CAS): | 79 mph/69 kts |
| Stall Speed, Gear and Flaps Down (CAS): | 71 mph/62 kts |
| Max Range | 1400 SM / 1216.5 NM |