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Old 02-17-2013, 06:06 PM   #21 (permalink)
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Quote:
Originally Posted by ChazInMT View Post
Flew a Warrior when I took lessons a few years back, so I like flying. You do realize that you were getting 18mpg in what is essentially my Civic while doing 140 mph. Fun, yes....Fast, you betcha..... beautiful view, Oh Man....worth every penny, certainly....efficient, debatable.
The aerodynamic resistance calculator gives me 40 MPG in an aerocivic with wings at 140 MPH, 170 at 65 MPH.
My math is flawed chances are.

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Old 02-17-2013, 08:08 PM   #22 (permalink)
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Originally Posted by H-Man View Post
The aerodynamic resistance calculator gives me 40 MPG in an aerocivic with wings at 140 MPH, 170 at 65 MPH.
My math is flawed chances are.

This civic gets about 45 mpg at 65 mph. EPA: 29/41
I fudged the the ecomodder calculator to get 45 mpg at 65 mph in a regular Civic sized car. It would get 13 mpg at 140 mph.
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Old 02-17-2013, 08:19 PM   #23 (permalink)
The brake pedal is evil
 
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Quote:
Originally Posted by mort View Post
This civic gets about 45 mpg at 65 mph. EPA: 29/41
I fudged the the ecomodder calculator to get 45 mpg at 65 mph in a regular Civic sized car. It would get 13 mpg at 140 mph.
-mort
I'm talking about the aerocivic, the aerocivic has half the Cd of a stock civic and the aerodynamic resistance is lower still because the air can go under the aircraft too.
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Old 02-18-2013, 03:04 AM   #24 (permalink)
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Originally Posted by H-Man View Post
I'm talking about the aerocivic, the aerocivic has half the Cd of a stock civic and the aerodynamic resistance is lower still because the air can go under the aircraft too.
I know, I just wanted to compare to a regular Civic.
-m
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Old 02-19-2013, 10:38 AM   #25 (permalink)
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Originally Posted by trooper Tdiesel View Post
would that make enuf force .
Of course not! Not without magnets on the vanes.
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Old 02-19-2013, 04:45 PM   #26 (permalink)
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Another problem with prop propulsion on the road is how steep of a grade can it climb since, unlike wheel propulsion, it is totally decoupled from ground friction? Most aircraft climb out at a fairly shallow angle compared to the steep grades you might encounter when entering a driveway or a parking lot where you need to drop into 1st gear to make it up the slope.
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Old 02-19-2013, 10:01 PM   #27 (permalink)
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Quote:
Originally Posted by basjoos View Post
Another problem with prop propulsion on the road is how steep of a grade can it climb since, unlike wheel propulsion, it is totally decoupled from ground friction? Most aircraft climb out at a fairly shallow angle compared to the steep grades you might encounter when entering a driveway or a parking lot where you need to drop into 1st gear to make it up the slope.
Almost the opposite. "Coupling" is misdirection. Rockets make vertical climbs totally decoupled from ground friction. If the propeller makes more thrust than than needed to climb the hill then you go up.
Air shows often have hopped up crop-duster biplanes that can make vertical climbs. The Piper Cub can make a 45 degree climb, and no road is that steep.
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Old 02-19-2013, 11:05 PM   #28 (permalink)
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Originally Posted by baldlobo View Post
i think he means to build one of these

hell yea, that ell get-er-done


there's no sustute for displacement right
a 460 or 454CI will fix any thing



if i can find one of those 3 or 4' fans used, i think ill give it a try.
but i really don't want to spend near $500 for a guess and by golly deal.
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Old 02-20-2013, 01:00 PM   #29 (permalink)
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Quote:
Originally Posted by basjoos View Post
Most aircraft climb out at a fairly shallow angle...
That has more to do with the stall speed of the wing than the thrust from the prop. Not to get too technical, but every wing has a certain minimum airspeed - roughly 50 mph for a light plane, more for jets - below which it stops producing lift. If that happens, the plane "stalls": the nose drops abruptly, and generally one wing drops quicker than the other, which can lead to a spin. That isn't something you want to have happen close to the ground. (See stall-spin accident.)

There's also the matter of best rate & angle of climb, which are quite a bit higher than stall. But you can hold a typical small plane on the edge of stall at maybe 40 degrees nose up angle.
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Old 02-20-2013, 01:15 PM   #30 (permalink)
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An engine/fan combo from an ultralight aircraft would fit the bill with what the OP wants...

That said that engine is suitable to push a 270lb aircraft and 150lb man around in a light wind... not a 4200lb SUV down a road. I don't think you would be able to obtain any sort of fuel economy gain...

If you want to prop an SUV skip the small props and go for a swamp boat propulsion system. Although I doubt you are going to get any better fuel economy than the engine in the SUV could provide....

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