Cessna 340A RAM VII performance numbers for Fltplan.com

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  • #83665
    jseabury
    Participant

      I use fltplan.com to file flight plans for my 1977 340A with RAM VII engines. This website allows you to put custom fuel flows, rate3 of climb, and climb, cruise, and descent airspeeds for every 1000 ft. altitude up to 30K ft. It also allows someone else who has done this in Fltplan.com to share their numbers. This way you will have more accurate fuel consumption numbers and times in your flight plan. so;

      Has anybody done this? If so would you share your profile?
      Does anybody have accurate numbers for my plane? I am happy to put them into fltplan.com and share them.

      Thanks,
      John Seabury
      john.seabury@comcast.net

      #95429
      rwelsh
      Participant

        John, I have been using FltPlan.com for 7 years and have fine tuned my operating numbers for my 1977 340A. I have 310 HP engines but run them at 330 HP with higher fuel flows and manifold pressures of the RAM VI numbers. My flight plans of 3 to 5 hours are usually only a few minutes one way or the other from FltPlan’s numbers. You are welcome to use my numbers. Just let me know how to let FltPlan know about the awap.
        Dick Welsh
        dick156@earthlink.net

        #96535

        I just bought a Cessna 340A with RAM VI engines. If you can share the numbers that you use in FLTplan with FF, speed, etc I would appreciated.
        I am trying to define the numbers using RAM performance numbers but would like to see what you have from personal experience.
        I also use FLTPlan and Foreflight
        Reiner

        #96539
        rstanley
        Participant

          I also recently bought my 1977 340A Ram VI
          Could you share the numbers with the group
          Thanks
          Richard

          #96544
          cochrane
          Participant

            Here are the numbers I use for my RAM VII. I normally fly between 18,000 and 25,000′ so I haven’t confirmed the mid-level numbers. For the preamble parameters:

            Taxi Fuel Burn: 3 gallons
            Fuel Flow, Climb 58 GPH ( 2600 RPM / 33″ MP) ( or 54 GPH with 2500 RPM)
            Fuel Flow, Descent 22 GPH @ 2,000′
            Fuel Flow, Descent 30 GPH @ 28,000′

            Attached file – Altitude / Speed
            Climb Cruise
            Altitude IAS FPM TAS Fuel Burn IAS
            0,000 120 1000 160 35 109
            1,000 120 1000 161 35 110
            2,000 125 1000 162 35 120
            3,000 130 1000 164 35 120
            4,000 130 1000 165 35 130
            5,000 130 1000 167 35 135
            6,000 130 1000 168 35 145
            7,000 130 1000 170 35 150
            8,000 130 1000 171 35 160
            9,000 130 1000 173 35 170
            10,000 130 1000 174 35 180
            11,000 130 1000 176 35 189
            12,000 130 1000 177 35 186
            13,000 130 1000 179 35 184
            14,000 130 1000 180 35 180
            15,000 130 1000 185 35 177
            16,000 130 1000 190 35 174
            17,000 130 950 193 35 170
            18,000 125 900 196 35 167
            19,000 125 900 199 35 163
            20,000 125 800 202 35 161
            21,000 120 750 205 35 157
            22,000 120 700 208 35 154
            23,000 115 650 210 35 150
            24,000 115 600 211 35 147
            25,000 115 550 212 35 143
            26,000 115 500 212 35 140
            27,000 115 400 212 35 137
            28,000 110 350 212 35 128

            #96559

            THank you.
            Very valuable info.

            #96582
            rwelsh
            Participant

              My number pretty well match Cochrane’s numbers except I use less fuel flow running LOP. I burn 30.4 GPH above 21,000 using 2350 RPM and 34″ LOP; maybe 2450 above 23,000 if the OAT is hotter then standard. You will have to run a higher RPM if you run LOP above 22,000 as there is not enough mass airflow at 2350 or 2400 RPM to give you 34″ MP.

              #97866

              Anyone that is using aircraft performance on fltplan.com and will share their data please indicate your user name, and tail number. Thank you. Gerry

              #97867
              rwelsh
              Participant
                quote :

                Anyone that is using aircraft performance on fltplan.com and will share their data please indicate your user name, and tail number. Thank you. Gerry

                If you want 340 LOP numbers which I have on fltplan.com, you can use mine. dick56 and N340RJ
                Dick Welsh

                #97873

                Dick; Thank you for posting your information. for fltplan,com

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