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-   -   56mpg at 138mph? (https://ecomodder.com/forum/showthread.php/56mpg-138mph-3635.html)

landspeed 07-09-2008 09:51 AM

56mpg at 138mph?
 
I put this in the alternative transportation section, because it is an alternative to car transportation. Feel free to move if there is somewhere better to put it :)

Basically, this plane:

Home

Does 56mpg (US) or 66.666mpg (Imperial) at cruise speed of 138mph.

This is pretty imprssive given the fact that a 747 does about 20-30mpgs 'per person' if you divide the fuel used by a FULL plane. In theory it should be more economical as you get more people into it. The plane above, despite being a single seater, generates less CO2 per mile per person than a 747 or other commercial planes.

If I get my private pilot's license I will be very interested in one of these, particularly living in NZ where it takes a LONG time to get anywhere by road :) a 2 seater version would be even better!

ebacherville 07-09-2008 11:20 AM

thats pretty awsome for flight.. really over coming the air resistance to move forward and holding your self up in the air at the same time... thats MPG rating is very impressive

jamesqf 07-09-2008 04:10 PM

IIRC some of Rutan's designs, like the VariEZ and LongEZ, would get in the mid-40s mpg, cruising at about 135 kts.

offroad1994 07-10-2008 07:54 AM

Why can this not be modified for land use? Oh yea - we need to stop and go on land.

elhigh 07-10-2008 10:19 AM

The Quickie II was a Rutan design I think, it used half a VW engine to deliver about 60mpg at 80-120mph, carried two. Funny to look at, too - two sets of very slender wings, like a dragonfly.

dremd 07-11-2008 12:28 PM

Diesel FTW!
Where do I sign up?
Always said that I wanted an airplane.

I've also seen a tiny plane that did about 100 mpg ( I think at 75 mph)on a Briggs vanguard 18 hp

ebacherville 07-17-2008 06:01 PM

wonder what kind of MPG those powered parachute things get.. at least you could fly from point a to b directly and never stop till you arive..

atomicradish 07-18-2008 03:37 PM

I'm sure you could improve upon the 56 mpg mark with a little EOC :)

jamesqf 07-18-2008 03:54 PM

Oh, you can do so much better than that. How about a combination of electric and solar/wind power? AE-1 Silent

Launch on the electric motor, then find a thermal and soar as long as you want, using zero fuel. And you can stay up for long periods - I've gone as long as 3 hours or so in a standard air-tow launched sailplane, and could go much longer if there was an on-board restroom :-)

bgd73 07-18-2008 09:22 PM

Quote:

Originally Posted by jamesqf (Post 45364)
Oh, you can do so much better than that. How about a combination of electric and solar/wind power? AE-1 Silent

Launch on the electric motor, then find a thermal and soar as long as you want, using zero fuel. And you can stay up for long periods - I've gone as long as 3 hours or so in a standard air-tow launched sailplane, and could go much longer if there was an on-board restroom :-)

I like that idea, better than an inline four trying to fly. I wonder what they did to the fuselage, controls and weight distribution to take on such an idiot wobbly engine. As a former aircraft crew chief, I was shocked when I learned of the first dainty 5 main bearing subaru engines in home made aircraft. That crank can't do a quick roll, 30 below and a few g's...but Anyway,
True flight has brought weirdos, temporarily, in aviation history. Given the times and borderline criminal for invention, I am not surprised anymore to see the photos of an inline diesel in an airplane.
Glide without an engine in my mind, it is peaceful.After recent years, aside form the 120v6 long over due, aviation and automobiles needs a fatherly engineer to set things straight or it will be war..(My truest scariest thought out loud.)

elhigh 07-18-2008 09:32 PM

Quote:

Originally Posted by ebacherville (Post 45027)
wonder what kind of MPG those powered parachute things get.. at least you could fly from point a to b directly and never stop till you arive..

Their fuel efficiency is atrocious. Speed under full throttle: 30mph, idling: 20mph. The ram wing is a great way to generate lots of lift at low speeds in a low mass form, but it costs at the pump.

Otto 08-14-2008 03:52 PM

That plane has only scratched the surface of aircraft fuel efficiency. Per research and development by aerodynamicists including Bruce Carmichael, Alex Strojnik, and Sig. Hoerner, a much more streamlined plane could be built and go faster on less fuel, using lighter weight and better aerodynamics such as laminar flow.

Consider that the not-too-good Sweitzer 2-32 sailplane is efficient enough with a ~49' wingspan to maintain level flight at ~60 mph on ~2 hp of thrust. That Sweitzer, btw, is a dog compared to current German sailplanes.

Whittle that plane down to half the size, weight, and wetted area, clean up its rough spots, any you'll get substantially better mileage.

In fact, ~30 years ago the Quickie got over 100 mpg flying at better than ~100 mph on an 18 hp Onan engine, like used in Winnebagos for aux generators. The Quickie, btw, was not the end-all and be-all of homebuilt planes. Small and light, though.

Who 08-14-2008 11:00 PM

Imagine the mileage over open water while flying bravely in ground effect.

Otto 08-14-2008 11:43 PM

Quote:

Originally Posted by Who (Post 53446)
Imagine the mileage over open water while flying bravely in ground effect.

I used to be more enthusiastic about ground effect vehicles, until I realized that you have to go to all the trouble and expense of aircraft construction, but then have a vehicle that only goes over water, often in poor visibility and wx conditions.

Better to climb above all that, the bad weather, and terrain, with a real airplane that can go anywhere on the earth's surface.


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