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  #21  
Old 08-16-2016, 10:53 AM
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RVbySDI RVbySDI is offline
 
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Quote:
Originally Posted by jchang10 View Post
It seems like the -8's are the winners in "total" performance (ie. speed combined with efficiency). I wonder what an -8 with -9 or -10 wings would be like. Anyone else curious?
Quote:
Originally Posted by NovaBandit View Post
Not if the performance number you're looking at is "passenger mile per gallon"!
Aww! That pesky word: Efficiency!

Each of us thinks we KNOW what the word means. And we indeed do. That is, we know what it means in terms of what our internal thoughts are concerning efficiency. However, we tend to think of it in specific terms only as it relates to what WE envision it to mean. If we think of speed as efficient, that is what we concentrate on. If we think of energy expenditure, well we think of that. Neither is completely appropriate to use without the other in the equation. Those are just two components. In most instances, there are many other variables that need defining in order to understand what constitutes efficiency. In order to fully discuss the term, all of them have to be defined.

To really comprehend efficiency for any given analysis the thing(s) being measured for efficiency have to be defined up front. Such is the result of the above contributions to this conversation. The term has different meanings for different people.

What makes an efficient Reno racer is most certainly going to be very different to what makes an efficient cross country glider.
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Last edited by RVbySDI : 08-16-2016 at 10:55 AM.
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  #22  
Old 08-16-2016, 11:07 AM
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F1Boss F1Boss is offline
 
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Default Coming' home from Reno



RVbySDI says:
"What makes an efficient Reno racer is most certainly going to be very different to what makes an efficient cross country glider."

That is a fairly fast glider! If I push it up a bit (not quite 20NMPG, but movin' right along):



Next time I'm up there I'll see what it does ROP.

Carry on!
Mark
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  #23  
Old 08-16-2016, 03:04 PM
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smokyray smokyray is offline
 
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Default L/D Max!

Great numbers Andy/Mark!
Having owned a Rocket (GAMI Injectors dual F.I.) and 2 RV's I'm looking at new efficiency numbers albeit on a lower scale in my Sonerai 2. I flew from Amarillo TX to Dallas (254nm) on 5.9 gallons of fuel. Roughly 40MPG @129KTAS!
The Ellison TBI on the GP2180 engine cranking out some amazing numbers, a bit slower but impressive nonetheless.
Thanks for sharing.
V/R
Smokey

Last edited by smokyray : 08-16-2016 at 04:06 PM.
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  #24  
Old 08-17-2016, 08:40 AM
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26.6 NMPG
RV7A, IO360 M1B direct from Lycoming (via Vans)
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Last edited by AltonD : 08-17-2016 at 08:42 AM.
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