lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> Posted for "John Lasher" <johnlasher@msn.com>: WOW!!!!!!! WHAT INSIGHT!!!!!!! OUGHT TO BE IN THE CHECKLIST OF ALL PILOTS RUNNING LOP!!! I was tempted to try to write something similar in response to some of the recent uninformed comments made in this forum on running LOP ("Fuel is cheap"). Although my experiences are similar to George Braly's, I would have fallen far short of the informed comments that he has given us; I have learned greatly from his comments. I have been following his procedure almost to the letter. So without repeating anything, I will give the final endpoint that I achieve at FL 240 (All other flight levels are similar except for TAS). I have been running these settings exactly for the past 350 hours since top overhaul. 30.5" MP @ 2500 RPM 17.0 gph (17.0 *13.7 = 233 hp or 67% of 350 hp) TIT 1600 - 1620 degrees (I lean to stay in this range) 268 KTAS at FL 240 Max CHT 360 (most are in the 325 - 350 range) Going to ROP @ 75% power at FL 240 I use 22.5 gph which gives me 284 KTAS or a 6 % increase in airspeed and a 32 % increase in fuel flow. Almost every other week I fly non-stop 1200 nm from Amarillo, TX to Naples, FL in 4.5 hours or less with 1.5 hours reserve. Yes, I do have a tail wind most of the time. If I were running ROP, I would have to stop which is expensive both in time and money. My engine has GAMI injectors that were tweaked over a 3-4 month interval. The engine goes LOP without any fuss; only a power loss is felt. This brings out another benefit of running LOP. You can't run your engine LOP unless everything is perfect. Think about it, if anything starts to get out of whack, the engine will let you know by shaking about and the temperatures will go crazy. In which case, all you have to do is to go ROP (things will probably smooth out), land and fix the problem. John Lasher Lancair IV-P N411WB LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com.