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I've been flying an IO-550-N (SR22) for a couple of years now. I
always fly it LOP except for take-off and climb. I have adopted a very
simple LOP protocol that works well with my engine at any rpm between
2500 to 2700. I've checked it hundreds of times against the GAMI "red
zone" chart and it's always worked out to be in the safe zone. As
always, YMMV. Please verify that these settings are safe for your own
engine:
0 to 3000 ft MSL = 15.5 gph
3000 to 7000 MSL = 14.5 gph
7000 ft MSL and above = 13.5 gph
13.5 gph works out to be peak EGT at around 10,000 MSL. The engine
can't make more than 65% power at that altitude anyway so I let it go
slightly ROP above 10,000 to maximize power output in the teens where
I usually fly. Walter taught us this "high-altitude / ROP" trick for
NA engines at APS several years ago. Of course going leaner up there
will greatly improve efficiency and range if that's your priority.
I like things quick and simple. I just level off and set the
appropriate FF. If I get bored later I'll put on my nit-picking hat
and fiddle with it.
Ron
On Sat, Jun 26, 2010 at 10:54 AM, Douglas Brunner
<douglasbrunner@earthlink.net> wrote:
> I typically take off and climb at wide open throttle - 2600 rpm. Fuel flows run about 28 gph at takeoff.
>
> As I climb I lean to about 1100 until I reach 70% power, then I lean to about 1200.
>
> On level off I leave my throttle wide open, reduce RPM to 2500 or 2400 and lean my engine to about 50 LOP.
>
> If I am not going high enough to get below 70% power, I will reduce either RPM or MAP until I am at 70% power or below and then go lean.
>
> For "fooling around" at lower altitudes I will set "23 squared" and lean to 50 LOP. This usually gives me a fuel flow of between 12 and 12.5 gph depending on temps, etc.
>
>
> -----Original Message-----
>>From: paul miller <paul@tbm700.com>
>>Sent: Jun 25, 2010 6:29 PM
>>To: lml@lancaironline.net
>>Subject: [LML] Re: LNC2/320 Cruise Speed
>>
>>Doug: (hi) where do you go LOP in the io-500? Just in cruise?
>>
>>Paul
>>
>>On 2010-06-25, at 4:48 PM, Douglas Brunner wrote:
>>
>>> The "GAMI boys" have a phrase for it:
>>>
>>> "3 knots for 3 gallons"
>>>
>>> Sounds like a good deal to me. I always fly lean of peak in cruise.
>>>
>>> D. Brunner
>>> WOTLOPSOP
> bowel wall thickening is noted involving the sigmoid colon
>
> --
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>
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