Steve Brown
Well Known Member
Hi All,
Last night on a flight from LLR-PAO I did a little more experimenting with running LOP.
I've got an O-320 with 9:1 pistons and EMag/PMag, Catto 3 blade
While leaning, eventually the motor will start to die, but it doesn't ever run rough.
21" MP
2500 RPM
131 KIAS
10 degrees C
7620' MSL
EGT range 1275-1300
CHT range 350-355
Fuel flow - less than ROP (no flow gauge yet)
When running ROP with the hottest EGT at 1300, the coolest will be 1200 or less. Also, CHTs will often run around 400.
So, the EGTs are more closely grouped and the CHTs are lower running LOP. I'm not sure why the EGTs come together for LOP, but that seems like a good thing.
I don't know my fuel flow yet. Next trip I'll run LOP both directions to get an idea of consumption.
Also, I generally cruise at 135 KIAS - IAS is a good indicator of power. I don't have an "official" power schedule for my engine, but I estimate that to be a bit over 65%.
Next time I'll bump the power up to get 135 KIAS running LOP
Last night on a flight from LLR-PAO I did a little more experimenting with running LOP.
I've got an O-320 with 9:1 pistons and EMag/PMag, Catto 3 blade
While leaning, eventually the motor will start to die, but it doesn't ever run rough.
21" MP
2500 RPM
131 KIAS
10 degrees C
7620' MSL
EGT range 1275-1300
CHT range 350-355
Fuel flow - less than ROP (no flow gauge yet)
When running ROP with the hottest EGT at 1300, the coolest will be 1200 or less. Also, CHTs will often run around 400.
So, the EGTs are more closely grouped and the CHTs are lower running LOP. I'm not sure why the EGTs come together for LOP, but that seems like a good thing.
I don't know my fuel flow yet. Next trip I'll run LOP both directions to get an idea of consumption.
Also, I generally cruise at 135 KIAS - IAS is a good indicator of power. I don't have an "official" power schedule for my engine, but I estimate that to be a bit over 65%.
Next time I'll bump the power up to get 135 KIAS running LOP