January 2009 Issue
First Word: 01/09
Here’s my definition of hell: Being marched at gunpoint into a small, windowless room with a laptop and being forced to write about lean-of-peak flying for eternity. Such is my fatigue with the subject, that where you have dreams about flying above sun-warmed cloud tops and landing on seaside runways, I have nightmares about peak pressure traces and runaway CHTs. The reason this is so is because 15 years ago, I got caught up in the thick of the leaning debate, wrote reams about it and figured it was time for the world to move on. But it hasn’t moved on. Comes this note from a reader: "My crusty, dinosaur belt-and-suspenders-old-school mechanic disabused me of lean of peak when I suggested it for my O-550. Instead, per his instructions, I cruise at 20 inches with 2300 RPM, 50 to 75 degrees ROP and burn an astounding 15.6 GPH…the engine went for 1500 hours before needing a top and in 20 years with two O-470s, I’ve had to overhaul only one jug. Using this anecdotal evidence, I suspect that it’s the overhaul companies that are advertising the fuel savings by pushing LOP procedures…Ol’ Crusty wins this one."
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