Cessna 340A vs Rockwell Commander 685
Side-by-side specs, range, and real operating costs for up to 5 aircraft.
Mission Performance
Tap to isolateValues normalised across compared aircraft. Fuel Economy is inverted (lower burn = higher score). See table below for raw figures.
Mission Performance Details
| Metric | Cessna 340A Cessna | Rockwell Commander 685 Rockwell |
|---|---|---|
| Stall Speed | 79 kts | 81 kts |
| Approach Speed | 93 kts | 106 kts |
| Cruise Speed | 229 kts | 222 kts |
| Range | 1,100 nm | 1,251 nm |
| Service Ceiling | 29,800 ft | 27,500 ft |
| Rate of Climb | 1,650 fpm | 1,490 fpm |
| Fuel Burn | — | — |
Flight Profile
Service ceiling, range, and climb rate.
Arc represents the climb-cruise-descent profile based on published service ceiling and range. Climb rate annotated on ascent. FL180 (18,000 ft) shown for reference.
Runway Performance
Density altitude adjusted estimates
Takeoff over 50 ft obstacle
Landing ground roll
FAA 10%/1,000 ft DA rule of thumb (FAA-H-8083-25B). Turboprops and jets are less sensitive in practice. Always verify against the POH.
Estimated Operating Costs
| Metric | Cessna 340A Cessna | Rockwell Commander 685 Rockwell |
|---|---|---|
| Fuel Cost per hour | —/hr | —/hr |
| Direct Operating Cost per hour | —/hr | —/hr |
| Annual Fixed Costs | ||
| Insurance | —/yr | —/yr |
| Hangar | —/yr | —/yr |
| Annual Inspection | —/yr | —/yr |
| Total Fixed | —/yr | —/yr |
Estimates only. Costs vary by location, pilot profile, and market conditions.
Capability, Limits & Dimensions
| Metric | Cessna 340A Cessna | Rockwell Commander 685 Rockwell |
|---|---|---|
| Useful Load | 1,848 lbs | 3,029 lbs |
| MTOW | 5,990 lbs | 9,000 lbs |
| Seating | 6 | 9 |
| Fuel Capacity | 163 gal | 256 gal |
| Engines | 2× Piston | 2× Piston |
| Landing Gear | Retractable | Retractable |
| Pressurized | Yes | Yes |
| Dimensions | ||
| Wingspan | 38.1 ft | 46.7 ft |
| Length | 34.3 ft | 42.1 ft |
| Tail Height | 12.6 ft | 14.1 ft |
Payload-Range Map
Origin: · click map to move