Cessna 425 Conquest I vs Commander 690

Side-by-side specs, range, and operating costs.

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Dimensions & configuration

Representative planforms, drawn to shared scale.

Cessna 425 Conquest I
44.2 × 35.8 ft 12.6 ft tall
2× Turboprop Retractable Pressurized
Commander 690
46.5 × 44.4 ft 14.9 ft tall
2× Turboprop Retractable Pressurized

Flight Profile

Service ceiling, range, and climb rate.

Tap legend to isolate

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.

Mission Performance

Stall, approach, cruise, range, ceiling and climb: best values are at the top.

Mission performance specifications
Specification Cessna 425 Conquest ICommander 690
Stall speed 84 kt82 kt
Approach speed 91 kt97 kt
Cruise speed 260 kt279 kt
Range 1339 nm1419 nm
Service ceiling 33400 ft31000 ft
Rate of climb 2000 fpm2849 fpm
Fuel burn 68.0 gph80.0 gph

Each axis is scaled independently across the compared aircraft and printed in its own units; every vertex sits at the published figure. Higher is better on all axes: Stall, Approach and Fuel Burn are inverted (lower = higher). A missing figure breaks the line at that axis.

Fuel Burn & Range

Range, endurance, and what the fuel costs by the hour.

Cessna 425 Conquest I Jet A
68.0 gph
Baseline
1,339 nm range 3.8 nm/gal 366 gal usable $408 fuel/hr 5h 22m endurance
Cessna 425 Conquest I: 68.0 gallons per hour at cruise, 1,339 nautical mile published range, 5 hour 22 minute endurance, 3.8 nautical miles per gallon.
Commander 690 Jet A
80.0 gph
Baseline
1,419 nm range 3.5 nm/gal 384 gal usable $480 fuel/hr 4h 47m endurance
Commander 690: 80.0 gallons per hour at cruise, 1,419 nautical mile published range, 4 hour 47 minute endurance, 3.5 nautical miles per gallon.
Jet A range each cell = 1 hr of cruise · width scales with speed

Bars show published still-air range. Endurance is usable fuel divided by the published cruise burn. Estimates only. Always verify against the POH.

Runway Performance

Density altitude adjusted estimates

Outside Air Temp
0°F57°F115°F
Field Elevation
SL4,0008,000 ft
Density Altitude

Takeoff over 50 ft obstacle

Landing ground roll

Base distance DA penalty
Scale: 6,000 ft

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

Scale:
Cessna 425 Conquest I Jet A
$1,045 /hr
Baseline
Cessna 425 Conquest I: $1,045 per flight hour — fuel $408, maintenance and reserve $637.
Commander 690 Jet A
$1,034 /hr
Baseline
Commander 690: $1,034 per flight hour — fuel $480, maintenance and reserve $554.
Cessna 425 Conquest I Turboprop
$28,000 /yr Baseline
Cessna 425 Conquest I: $28,000 per year — insurance $16,500, hangar $9,000, annual inspection $2,500.
Commander 690 Turboprop
$38,058 /yr Baseline
Commander 690: $38,058 per year — insurance $23,000, hangar $12,558, annual inspection $2,500.

Estimates only. Costs vary by location, pilot profile, and market conditions. See individual aircraft pages for source notes.

Capability & limits

Each bar stacks your selected occupants against full fuel and the aircraft's useful-load limit (the black line). The open gap between them is spare payload. Add an occupant and the gap closes; once it's gone, fuel has to give.

lb

+ lb / pax

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Cessna 425 Conquest I
8 / 8 seats 366 / 366 gal fuel 821 lb wet payload 3,273 lb useful 8,600 lb MTOW
Commander 690
7 / 7 seats 384 / 384 gal fuel 1,607 lb wet payload 4,180 lb useful 10,325 lb MTOW

Occupants at 190 + 30 lb each. Fuel at 6.7 lb/gal jet-A, 6.0 lb/gal avgas.

Payload-Range Map

Origin: · two fingers to move map

lb

+ lb / pax

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1

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