The 680E was certified on June 19, 1958, to CAR 3 Amendment 12. The 680E is modified 680 by increasing gross weight to 7500, adding the 32-inches to the wingtip and a Lycoming GSO480-B1A6 (340HP).
Specification Performance Kit Finder| Span - 680E | 49.04' | 14.94m |
| 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-B1A-6
| Max Ramp Weight: | 7500 lbs/ 3402 kg |
| Take-off Weight: | 7500 lbs/ 3402 kg |
| Landing Weight: | xxx lbs/xxx kg |
| Standard Empty Weight: | 4522 lbs/ 2051kg |
| Useful Load: | 2978 lbs./ 1351kg |
| 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 |