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mark.j(at)yakuk.com
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Posted: Mon Feb 20, 2006 3:16 am Post subject: Tin

http://www.fuelcat.co.uk/history.html   

   

can Brian or would Ernie like to comment on this subject. About ½ way down the page is the interesting stuff ref Russian a/c.  I know there are experts on this list ref Ethanol additives in fuel.  

   

Cheers, mj

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Mon Feb 20, 2006 10:14 am Post subject: Tin

Mark Jefferies-YAK UK wrote:

 	  Quote: 	
		   http://www.fuelcat.co.uk/history.html

 

  

 

 can Brian or would Ernie like to comment on this subject. About ½ way

 down the page is the interesting stuff ref Russian a/c.  I know there

 are experts on this list ref Ethanol additives in fuel.


	


I don't see any references to alcohol in your link but will comment

anyway as I suspect that the US is going to go in for ethanol in a big

way here very soon. We have the ability to produce it in quantities that

make it attractive.



Ethanol has two strikes against it as a replacement fuel for aircraft:



1. It tends to be more corrosive. You have to go through your fuel

system and replace things that are prone to attack by alcohols.



2. It has only about 1/2 the energy density of gasoline. Here:



	Ethanol:	 26.8 MJ/Kg (megajoules per kilogram)

	Gasoline:	~45   MJ/Kg



That means, to produce the same horsepower for the same length of time,

you will need to carry almost double the weight of gasoline in alcohol.

Either that or cut your range in half.



The only good thing about alcohol is that it has such a high octane

rating that detonation is almost impossible. This lends itself to very

high power-to-weight ratio high-compression supercharged engines or

engines that are much more efficient.



If you just want an airplane to play with locally, alcohol might be an

acceptable fuel. If you want an airplane to go cross-country with,

alcohol sucks.



-- 

Brian Lloyd                         361 Catterline Way

brian-yak at lloyd dot com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

- Antoine de Saint-Exupery

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

L39parts(at)hotmail.com
Guest

Posted: Mon Feb 27, 2006 7:44 pm Post subject: Tin

So do you guys have to wear flight suits over  there?

 [quote]   ---

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L39parts(at)hotmail.com
Guest

Posted: Mon Feb 27, 2006 7:53 pm Post subject: Tin

3) vapor pressure



---

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Mon Feb 27, 2006 9:02 pm Post subject: Tin

On Feb 27, 2006, at 7:53 PM, Ron Davis wrote:

 	  Quote: 	

 3) vapor pressure

Good point. I was thinking that the RVP of ethanol was lower than  

gasoline. Even so, that is just a minor engineering problem. You  

can't engineer away lower energy density.

 	  Quote: 	
		  > Ethanol has two strikes against it as a replacement fuel for  

> aircraft:

>

> 1. It tends to be more corrosive. You have to go through your fuel

> system and replace things that are prone to attack by alcohols.

>

> 2. It has only about 1/2 the energy density of gasoline. Here:

>

> Ethanol: 26.8 MJ/Kg (megajoules per kilogram)

> Gasoline: ~45   MJ/Kg

Brian Lloyd                         361 Catterline Way

brian-yak at lloyd dot com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

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