REFLECTOR: Fuel Consumption Performance

Terry Miles terrence_miles at hotmail.com
Thu Aug 27 19:04:15 CDT 2009


Scott,
No I said what I intended.  I leaned the engine based on the first to peak.
If I took the last to peak, then the first would be over 100 
lop when the last cly would be right on.  I opted for reverse of that--or to
say the 1st to peak cyl to to be right on and the later cly to be whatever
they come out to be.  The very last is in fact ROP by some small amnt which
was what I was doing before this anyway.  Isn't that the way you are
supposed to do this?
Terry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Thursday, August 27, 2009 17:54
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Fuel Consumption Performance

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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