REFLECTOR: Fuel Consumption Performance

Scott Derrick scott at tnstaafl.net
Thu Aug 27 17:54:06 CDT 2009


Terry,

you said

pulled the mixture out until they were all LOP and enriched back on the
first to peak so to get 50 LOP

I hope you meant "...enriched back on the LAST to peak..."

Scott

Terry Miles wrote:
>
> Al,
>
> Here is my cruz engine log to include this last IN to CO trip.
> Westbound was full power. 10,000 will get me mid 180 Kts TAS and
> 12,000 gets mid 190 kts TAS. That runs about 11.5 at full throttle and
> leaning 50 LOP. Thanks to Scott I did it right and pulled the mixture
> out until they were all LOP and enriched back on the first to peak so
> to get 50 LOP. It was hardly any real effective difference, but better
> to do it right. (And I never got to KLMO when I was asking about high
> dens alt ops.)
>
> As the log shows, on the way back at 11,000 I pulled back to try and
> hold mid 170's for speed, and I pulled the prop rpm back some too, but
> it doesn't sound good below 2100 for some reason. Anyway I was able to
> get 9.5 for a fuel flow. Next good tailwind and I'll try mid 150's for
> a speed.
>
> Also for what it worth for you other fellow newbies and flatlanders
> out there, I had it in my head and in my muscle memory that cooler
> temps mean more leaning since those are the mixture adjustments I have
> been making hundreds of times now. When I got out on the runway for
> takeoff run…I put the throttle in full, then I leaned the mixture
> leaning for peak…when I got to peak I instinctively _leaned _for the
> 100 cooler instead of enriching to get the 100 cooler. Of course I
> immediately saw this and fixed it, but I was surprized at myself…all
> while the engine is at full blast and my head is on the departure
> matters and checklists. Thought I'd toss that in. What not to do is
> often as good as knowing what TO do.
>
> Terry
>
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> *On Behalf Of *Al Gietzen
> *Sent:* Wednesday, August 05, 2009 11:34
> *To:* 'Velocity Aircraft Owners and Builders list'
> *Subject:* Re: REFLECTOR: Fuel Consumption Performance
>
> Al,
>
> Hey thanks for that. Can I do anything to help fill in the matrix any
> better? I could get you some 165 TAS numbers on my next long trip. It
> seems like runs at similar altitudes and TAS would make for the
> easiest comparisons. But, I could fly at whatever altitude or fuel
> flow, etc you wanted to know about.
>
> Terry;
>
> I think I’ve gone as far as going with that – I was just
> tabulating/correlating the reported data for easier viewing. I’d be
> more interested in comparison data for alternative engines, although
> that then needs to be compared with the certified engines.
>
> I think each person should gather some data on their own plane, for
> their own purposes; starting with verifying the accuracy of the
> airspeed and fuel flow readings. Then it might be fun to compare some
> data for the same models at the same TAS at the same elevation.
>
> So if all you folks flying would, whenever convenient, like to post
> some data for your M&M and engine type at, say:
>
> Leaned cruise
>
> 150 KTAS
>
> 9500 ft;
>
> it would be interesting.
>
> Best,
>
> Al
>
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