RE: [COUPERS-TECH] Ercoupe Economy

[Scott Morgan]

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Before I overhauled the engine on my A2-A, I had an 0-200. I would fly that engine at the lower RPMs and got a burn of around 4.5 GPH. Then we installed a newly overhauled C-90 and I was told that one should not baby these smaller Continental engines as it does them more harm than good. That is what I am told and I don't know if this is the gospel or not. I operate the new engine at no less than 2300 RPM in cruise and use 5.5+ GPH. Of course I only have 80 hrs. on the engine, so, maybe this is why I should not baby it along.

 

Scott

5458F

Ed Burkhead <[EMAIL PROTECTED]> wrote:

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Marty,

 

Great experiment.  I bet you get great numbers when you go on longer flights, too.

 

As a reference for others, I’d recommend Stick and Rudder Chapter 19, “The Working Speeds of an Airplane” discuss and explain this issue well.  In addition, for long cross country trips for transportation, Chapter 20, “Thin Air” discusses the speed/mileage improvements when you fly high and lean.

 

Marty, I think your fuel consumption numbers sound a bit low to me but the difference sounds reasonable between normal cruise and slower cruise.  You might want to do the experiment over longer flights or over multiple fill-ups.

 

For example, I got my 7146 prop, 2400 rpm fuel burn number of 5.4 gph through three tanks of fuel flying from Illinois to Pennsylvania.  That gave enough data for a pretty good number.

 

Ed Burkhead

http://edburkhead.com

ed -at- edburkhead???.com          (change -at- to @ and remove "???")

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