REFLECTOR: Fuel Consumption Performance

Mon Aug 3 19:42:44 CDT 2009

The IO 550N has a lower BSFC because of the intake tuning.

________________________________
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Monday, August 3, 2009 5:15:31 PM
Subject: Re: REFLECTOR: Fuel Consumption Performance

You want the BSFC number.  Brake Specific Fuel Consumption.  The smaller
the number, the better.

Typically, the following lower the BSFC:
large displacement
high compression ratio
low RPM

Tom Tolton wrote:
> I recently traveled to Oshkosh with a friend who owns a Velocity 173
> with fixed gear and a 200 HP fuel injected Lycoming.  He was able to
> reduce gas consumption to 6.2 gallons per hour at 10500 feet and
> maintain a speed of about 125 nm/hr using LOP techniques. 
> 
>  
> 
> I am building a XLFG -5 with constant speed propeller.  I am looking for
> what one might expect in minimum gas consumption using LOP techniques at
> a density altitude of 10000  feet.  I am considering the Lycoming IO540
> 260 and 300 HP, as well as, the 310 HP Continental 550N.  It has been
> suggested that if I buy one of the more powerful 300 HP engines  I will
> just be able to run with less throttle and bring the fuel consumption to
> a reasonable level.
> 
>  
> 
> I would appreciate any comments / experience of the builders and owners
> with a similar XLFG configuration.    
> 
>  
> 
>  
> 
>  
> 
> Tom Tolton
> 
> 989-835-5828 (Home)
> 
> 989-750-8567 (Cell)
> 
>  
> 
> 
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