|
|
Greetings,
On my way back from Copperstate I did a GAMI lean test at 13,500' and collected a bunch of data on mixture, temps, cruise speed, etc. I continue to be pleased and amazed by the speed and efficiency of this little airplane (320 MKII). I love this machine!!!
The spreadsheet has the details, including a chart of cruise speed and mileage vs. fuel flow. I tried to paste the data into the body of this message for those without Microsoft Excel -- hope it looks okay on your screen.
I have more GAMI test data if any of you are interested. I am finding that my cylinders all peak within 0.2-0.4 gph of each other with the stock injectors. Not too bad I guess, but the engine does start to get a little rough right about peak, so I don't run on the LOP side that much but would like to. I know George recommends 65% power and this particular data is about 55% due to altitude. I have other similar data at lower altitudes and 65%, all with similar results.
Regards,
Dan
Engine Lycoming IO-320-D1B, 160HP, ram air induction
Prop Hartzell 70" constant speed
MAP 18.2
RPM 2,300
Pressure Alt 13,300
OAT (deg C) 8
Fuel Cap (gal) 42
Reserve (gal) 5
Climb Fuel 5
Cruise Fuel 32
GPH Mixture TAS (kts) IAS (kts) NM/gal Stat. MPG Range (nm) Range (mi) Cruise Endurance (hrs) Comments % PWR
7.1 80-90 ROP 183 144 25.8 29.6 825 949 4.5 Smooth 55%
6.8 184 144 27.1 31.1 866 996 4.7 Smooth 55%
6.6 50 ROP 184 144 27.9 32.1 892 1026 4.8 Smooth 55%
6.4 181 142 28.3 32.5 905 1041 5.0 Smooth 55%
6.1 180 141 29.5 33.9 944 1086 5.2 Smooth 55%
6.0 179 140 29.8 34.3 955 1098 5.3 Very light engine roughness 55%
5.8 Peak 176 138 30.3 34.9 971 1117 5.5 Very light engine roughness 54%
5.6 175 137 31.3 35.9 1000 1150 5.7 Very light engine roughness 53%
5.4 10-20 LOP 170 133 31.4 36.1 1006 1157 5.9 Engine roughness 51%
5.2 20-30 LOP 160 125 30.7 35.3 982 1129 6.2 Significant engine roughness 49%
|
|