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leaning

 
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dlm34077(at)gmail.com
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PostPosted: Fri Jul 21, 2017 4:57 am    Post subject: leaning Reply with quote

I use 2250 RPM as that is the IO540 best torque point. I also use about 22.5 MP or FT. This provides about 60% and LOP fuel flows about 9 gph and 150KTAS. I have had the aircraft to 17000 MSL over the four corners area and showing about 50%, KTAS 150 and flow of slightly under 9 gph. Try best torque RPM to achieve 150 KTAS and flows of about 9 gph. The running is smooth and saves 1-3 gph by giving up about 10 KTAS.
Don't know the top speed having never been there. When I see 25 gph flow for FT takeoff; I begin to think about leaning; With two people it will climb faster than a spam can evenĀ at 55-60%.
David McNeill
N46007


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Mauledriver(at)nc.rr.com
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PostPosted: Fri Jul 21, 2017 5:52 am    Post subject: leaning Reply with quote

I run about the same; 2200-2300 RPM and FT. I can get 9.2 gph and
150KTAS at 9,000 and above but I now aim for 155KTAS which takes the
fuel flow to 10.0 to 10.6. Nice know that the best torque point is
around 2250 because I've arrived at that figure by 'feel' (?).
Generally if I have a headwind I'll run more fuel thru it to get 155
-160KTAS and if a strong tailwind I roll the fuel back to do 150-155KTAS.

What I do on the climb is FT with a roll back from 2700 to 2600 once the
climb is established. Then at 1500 to 2000MSL I hit the leaning
function on my GRT. Once all cylinders' EGT falls to -10F I start
leaning to keep it there.

dAs I understand it, the thinking behind that is that the engine is
setup so that full rich and FT at sea level is safe in terms of cylinder
cooling and detonation. Then as you climb the engine at full rich is
progressively too rich. Waiting until 2000MSL then letting the EGTs
fall 10F keeps things conservatively rich (ROP) at which point I begin
leaning to stay there. I get some significant fuel flow savings on the
climb with flows dropping below 20gph before climbing thru 9k.

On 7/21/2017 8:54 AM, dlm wrote:
Quote:
I use 2250 RPM as that is the IO540 best torque point. I also use
about 22.5 MP or FT. This provides about 60% and LOP fuel flows about
9 gph and 150KTAS. I have had the aircraft to 17000 MSL over the four
corners area and showing about 50%, KTAS 150 and flow of slightly
under 9 gph. Try best torque RPM to achieve 150 KTAS and flows of
about 9 gph. The running is smooth and saves 1-3 gph by giving up
about 10 KTAS.

Don't know the top speed having never been there. When I see 25 gph
flow for FT takeoff; I begin to think about leaning; With two people
it will climb faster than a spam can even at 55-60%.

David McNeill
N46007

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