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  #11  
Old 12-31-2007, 03:24 PM
smenkhare smenkhare is offline
 
Join Date: Jan 2007
Location: Sydney Aus
Posts: 55
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there are a couple of "homebuilt" they only one i can think of is epic aircraft but there are at least three others.

they all require you to use their builder assistance center though.
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RV-10 wannabe
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  #12  
Old 12-31-2007, 04:57 PM
6 Gun 6 Gun is offline
 
Join Date: Jun 2005
Posts: 846
Default JETS

the guy that owns blue mountian avioncs put a small GE in a cozey there was a nice write up in eaa a year or so ago i think it was a engine called a J5 burned 30 gal hour
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  #13  
Old 12-31-2007, 10:11 PM
Eddie P's Avatar
Eddie P Eddie P is offline
 
Join Date: Oct 2007
Location: Aptos, CA (previously Reno, 21 years!)
Posts: 247
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I bet we'll see more turbines in the future of GA and EAA'ers but I believe they will be in purpose built airframes, probably resembling Long EZ or wing and boom type shapes with the jet exhaust in the rear.

The 'next generation' very light turbofans will have much better efficiencies. However, my best guess is that turbofans will always be pricey due to the exotic materials and engineering tolerances required, to spite the fact that they are simpler in 'theory' than a piston engine.

Agreed, turbofans will also always perform most efficiently up higher in thin air where fuel burn is relatively low and airframe drag is equally low for relatively high true airspeeds. I would not be suprised to see efficiently low fuel burns for optimim economy cruise flight profiles for tomorrows turbofan GA planes that approach the more inefficient 100LL burners of yesterday.

But... Jets are lousy at pattern work if you are paying the bills, and equally wonderful at pattern work if you are not paying the bills and just flying them

It's still a ways out though. I'd 'settle' for a nice RV for now
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  #14  
Old 12-31-2007, 10:33 PM
Phil MacFarlane Phil MacFarlane is offline
 
Join Date: Dec 2007
Location: Northern California
Posts: 11
Default RV-4 Jet

Here is a RV-4 with an Innodyn jet.

http://www.youtube.com/watch?v=1PB4Fhge4oI

Phil
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  #15  
Old 01-01-2008, 09:02 AM
Steve Steve is offline
 
Join Date: Jan 2005
Location: Roy, Utah
Posts: 1,144
Default fuel payload

On my earlier Mustang post, the 600 pound figure was the full fuel payload not the weight of fuel on-board. I misread the spec sheet. It's a small aircraft but not that small.

Oops,
Steve
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  #16  
Old 01-01-2008, 10:10 AM
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Capflyer Capflyer is offline
 
Join Date: Feb 2005
Posts: 1,082
Default BD-10

Google and youtube the BD-10. There are some videos of it on youtube. Pretty cool airplane that maybe someone with money could take to the next step.
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  #17  
Old 01-01-2008, 10:58 AM
nucleus nucleus is offline
 
Join Date: Sep 2006
Location: Bozeman, Montana
Posts: 858
Talking Smaller Diameter= Lower Efficiency

Another factor is that the efficiency does down as a cubic function of the diameter, so you loose a lot of efficiency really fast. If you look at the new more efficient turbofans on the new Boeings for example, you can see that they are a lot bigger around than than the turbofans on an older plane.

Hans
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  #18  
Old 01-01-2008, 12:41 PM
asav8tor asav8tor is offline
 
Join Date: Oct 2006
Location: Seattle, wa
Posts: 679
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Quote:
Originally Posted by nucleus View Post
Another factor is that the efficiency does down as a cubic function of the diameter, so you loose a lot of efficiency really fast. If you look at the new more efficient turbofans on the new Boeings for example, you can see that they are a lot bigger around than than the turbofans on an older plane.

Hans
Then the next step is the unducted fan.........

Sonn after that a student of aerodynamics will point out less blades are more efficient.

Then after we reduce the unducted fan blades down to 2 someone will point out the bsfc is better on an intermittent basis over a continuous burn.....

Someday we will put it all together with a direct drive piston engine and a constant speed 2 blade prop.......
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  #19  
Old 01-01-2008, 01:08 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 873
Thumbs up diameter of jet engines

Quote:
Originally Posted by nucleus View Post
Another factor is that the efficiency does down as a cubic function of the diameter, so you loose a lot of efficiency really fast. If you look at the new more efficient turbofans on the new Boeings for example, you can see that they are a lot bigger around than than the turbofans on an older plane.

Hans
The large diameter you see is the N1 section. The actual turbine engine is quite a bit smaller. The modern HIGH Bypass Ratio t-fan derives most of its thrust not from the jet exhaust but from the N1 fan section and bypass air.
It is essentially a ducted fan. Modern jet engines are amazing ( the F-22 can only do the things its does because of advancements in engine fuel and air management abilities.)
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  #20  
Old 01-02-2008, 04:03 AM
smenkhare smenkhare is offline
 
Join Date: Jan 2007
Location: Sydney Aus
Posts: 55
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oh and there is also the compair jet
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