Piper Commanche vs Money 201

I wonder what that would look like on George Braly's test bed analyzers.
"CriticalMass" wrote in message ...

"Dan Luke" wrote in message ...

What's your plan for break-in?
--

Basically, I plan to cruise around 100-125 degrees ROP at around 75 percent power, never baby it, always keeping a eye on the GEM.

My IA tells me Mattituck provided some guidelines with the engine when it came back, and I haven't had the opportunity to review those yet. But the main things are to keep the power up, temps down (or at least, normal), and keep the mineral oil in there till consumption stabilizes or after.

"CriticalMass" wrote:
What's your plan for break-in?

But the
main things are to keep the power up, temps down

That's the ticket. Run it hard, run it cool.
--
Dan
C172RG at BFM

"Dan Luke" wrote in message
...
"CriticalMass" wrote:
What's your plan for break-in?

But the
main things are to keep the power up, temps down

That's the ticket. Run it hard, run it cool.

I see you're just north of Dauphin Island. I've been meaning to get over
there and scout around the place for years now and haven't made it, for
various reasons, most of which involve either weather or laziness.

Do you get down there ever? Would it be worthwhile as a sightseeing
daytrip? Is the strip serviceable?

Dave

Paul Sengupta wrote:
: Pirep:

: Went flying yesterday and tried LOP again in my Bulldog
: (Lycoming IO-360, standard FIs). Seemed to work ok.
: Needed a fair bit higher MP to maintain the speed, but the
: CHT (only one) was much lower than "normal". However
: one thing I found was that the fuel burn for the same speed
: didn't seem any lower, and was possibly a bit higher than
: what I normally fly. I fly on pretty low power anyway usually
: so I lean until the power starts reducing then bring it back a
: shade. Probably the max-power setting, though only at about
: 50% power or so.

This makes sense because you were using airspeed to set your
engine power, which is probably the most correct method. Trouble is, the
airframe doesn't care how you make the power
(MP/RPM/Mixture/CHT/EGT/etc)... 75% of 200 hp is 150 hp, and that's what
it takes to go at "cruise speed." Adding an inch or two also make sense
if you were truly running LOP. Take a look at:
http://www.avweb.com/newspics/tcm_mixture_sweep.jpg from the article
http://www.avweb.com/news/columns/182179-1.html

Although I fly a carb'd O-360, I try to lean as aggressively as
possible. Unfortunately, that generally means right at about peak EGT
before roughness sets in. Lycoming themselves say that if the power is
kept below 75%, that's an acceptable "economy" cruise. I figure that it
should be safe, and I never cruise at 75% anyway... usually 65% for a
safety margin. BTW, it flies *exactly* by the book at those settings.
Cruise speed, fuel burn, etc... Almost perfect 8.5 gal/hour at 65%.

-Cory

--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

"CriticalMass" wrote:
I see you're just north of Dauphin Island.
Do you get down there ever?

I do a t-'n'-g there once in a while. Flying up and down the beaches is
fun.

Would it be worthwhile as a sightseeing
daytrip?

Yes, but the beaches are better over on the east side of the pass at
Gulf Shores/Orange Beach.

Is the strip serviceable?

Yep. Don't know if there's a courtesy car, fuel, etc.
There's a dandy little seafood restaurant on that side of the bay, a
few miles north of Dauphin Island.
--
Dan
C172RG at BFM