Cessna 340/A Stock Airplane vs. RAM Series IV
Primary Specifications Cessna 340/A RAM 325 hp Series IV
Engine Model: Continental - TSIO-520 -N & -NB -NB
Horsepower: 310 325
TBO - hours 1,400 & 1,600 1,600
Fuel - with 63 gal. Aux.- useable - gallons 163 163
Takeoff Manifold Pressure @ 2700 rpm 38” 41”
Takeoff Runway Acceleration - 0 to 100 mph 21 sec. 16 sec.
Twin Climb - ISA - Cessna 5,990 lbs. / RAM 6,290 lbs. 1650 fpm 1815 fpm
Single Climb - ISA - Cessna 5,990 lbs. / RAM 6,290 lbs. 315 fpm 340 fpm
Climb Power - ISA + 30°F - rpm / MP 2450 / 31.5” 2500 / 35.0”
Cruise Climb - SL to 18,000 ft - min. 22 16
Cruise @ 75% - ISA - 20,000 ft. - ktas 215 225
Cruise @ 65% - ISA - 20,000 ft. - ktas 200 210
Cruise @ 55% - ISA - 20,000 ft. - ktas 185 195
Useful Load Increase - lbs. 340 & 340A NA +315 & +300
Ramp Weight - lbs. 340 & 340A NA 6,330 & 6,330
Gross Weight - lbs. 340 & 340A 5,975 & 5,990 6,290 & 6,290
Landing Weight - lbs. 340 & 340A 5,975 & 5,990 5,975 & 5,990
Zero Fuel Weight - lbs. 340 & 340A NA & 5,630 5,690 & 5,630
SOURCE: Sources
Cessna 340/A Stock Airplane vs. RAM Series VI
Primary Specifications Cessna 340/A RAM 335 hp Series VI
Engine Model: Continental - TSIO-520 -N & -NB -NB
Horsepower: 310 335
TBO - hours 1,400 & 1,600 1,600
Fuel - with 63 gal. Aux.- useable - gallons 163 163
Takeoff Manifold Pressure @ 2700 rpm 38” 41”
Takeoff Runway Acceleration - 0 to 100 mph 21 sec. 15 sec.
Twin Climb - ISA - Cessna 5,990 lbs. / RAM 6,290 lbs. 1650 fpm 1930 fpm
Single Climb - ISA - Cessna 5,990 lbs. / RAM 6,290 lbs. 315 fpm 355 fpm
Climb Power - ISA + 30°F - rpm / MP 2450 / 31.5” 2500 / 35.0”
Cruise Climb - SL to 18,000 ft - min. 22 15
Cruise @ 75% - ISA - 20,000 ft. - ktas 215 228
Cruise @ 65% - ISA - 20,000 ft. - ktas 200 213
Cruise @ 55% - ISA - 20,000 ft. - ktas 185 198
Useful Load Increase - lbs. 340 & 340A NA +415 & +400
Ramp Weight - lbs. 340 & 340A NA 6,430 & 6,430
Gross Weight - lbs. 340 & 340A 5,975 & 5,990 6,390 & 6,390
Landing Weight - lbs. 340 & 340A 5,975 & 5,990 6,075 & 6,075
Zero Fuel Weight - lbs. 340 & 340A NA & 5,630 5,790 & 5,630
SOURCE: Sources
Cessna 340/A Stock Airplane vs. RAM Series VII
Primary Specifications Cessna 340/A RAM 340/A VII
Engine Model: Continental - TSIO-520 TSIO-520-N/-NB TSIO-520-NB
Engine hp rating / TBO - hrs. 310 / 1600 335 / 1600
Takeoff M.P. @ 2700 rpm (ISA + 30° F) 38” 38”
Acceleration 0 to 100 mph (seconds) 21 15
Twin engine climb @ S.L. (fpm) @ new GW 1650 1930
Single engine climb @ S.L. (fpm) @ new GW 315 355
Cruise climb power (rpm @ MP) (ISA + 30° F) 2450 @ 31.5” 2500 @ 33.0”
Cruise climb S.L. to 23,000 ft. (minutes) 31 23
260 hp Cruise @ 23,000 ft. (ktas) / Fuel/engine (gph) NA 232 @ 20.3
230 hp Cruise @ 23,000 ft. (ktas) / Fuel/engine (gph) 206 @ 19.3 219 @ 17.9
200 hp Cruise @ 23,000 ft. (ktas) / Fuel/engine (gph) 185 @ 16.5 205 @ 14.7
Landing Wt. & Zero fuel Wt. (lbs.) - 340/340A 5,975 / 5,990 & 5,630 / 5,630 6,075 & 5,630
Useful load increase (lbs.) - 340/340A NA +395 / +380
Gross Wt. & Ramp Wt. (lbs.) - 340/340A 5,975 / 5,990 & NA 6,390 / 6,430
SOURCE: Sources

Performance is based on a mid CG with mid cabin and fuel weight on an average day. Performance should always be calculated per flight environment while referring to the Manufacturer’s Pilots Operating Handbook and applicable Flight Manual Supplements for the particular airplane. Aircraft Manufacturer’s Pilot Operating Handbooks and Aircraft Owner’s Manuals should always be available and adhered to by the aircraft Pilot in Command, including attention to applicable FAA approved Flight Manual Supplements and emergency procedures for each individual aircraft. Performance should vary from airplane to airplane, atmospheric day to atmospheric day, one gross weight and CG to another, and pilot to pilot.

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