REFLECTOR: Fuel Consumption Performance

David n350tx at att.net
Tue Aug 4 08:42:28 CDT 2009


I am normally aspirated so I usually do not fly over 10M.  However my fuel
consumption is better with some loss of TAS.
Dave Bertram 
 
-------Original Message-------
 
From: nmflyer1 at aol.com
Date: 8/3/2009 10:20:58 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Fuel Consumption Performance
 
Sounds great. About the same redrive ratio as I have. I hope to cruise
around that RPM.. depending on the sweet spot that all chevys have. Have you
checked the numbers higher?  I usually have to cruise at 10.5-13.5 to get
where I need to go. 

Look forward to seeing/hearing your bird someday. 

 Kurt 


-----Original Message-----
From: David <n350tx at att.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Aug 3, 2009 9:07 pm
Subject: Re: REFLECTOR: Fuel Consumption Performance


79F8FDE2-E90C-4120-9A2C-E484CCFAA091
cid:7258A615-E3E5-413F-95B0-ACF2EF89334B repeat #f3eded left top
BCEB29C0-42D3-11D4-BA3E-0050DAC68030 0 BCEB29C0-42D3-11D4-BA3E-0050DAC68030
1 A5BE2A00-37CC-11D4-BA36-0050DAC68030 0
A5BE2A00-37CC-11D4-BA36-0050DAC68030 1 601231A0-325F-11D4-BA2D-0050DAC68030
0 X-ASN,X-ASH,X-AN,X-AP,X-AD ; THE ENGINE RUNS AT 3700RPM AND THE PROP AT
2100RPM.  Mp IS 23.  At 8500msl I still have a lot of throttle.
DAVE BERTRAM 
 
-------Original Message-------
 
From: nmflyer1 at aol.com
Date: 8/3/2009 9:19:57 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Fuel Consumption Performance
 
Considering your low altitude Dave, That sounds pretty good! What RPM were
you doing at those numbers? 

Kurt 


-----Original Message-----
From: David <n350tx at att.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Aug 3, 2009 7:03 pm
Subject: Re: REFLECTOR: Fuel Consumption Performance


79F8FDE2-E90C-4120-9A2C-E484CCFAA091
cid:2648E5ED-F796-444D-8B2F-016EB110B9C5 repeat #f3eded left top X-ASN,X-ASH
X-AN,X-AP,X-AD ; I just came back from Oshkosh and I had 14.3gph at 185kts
tas.  I cruised at 5500 to 8500.  I have not run my Chevy lean of peak yet
since there is little info on that operation.  With the big engines you
probably will not do any better than 12gph at most altitudes.
 
Dave Bertram
N350TX
Chevy V-8
 
 
-------Original Message-------
 
From: Tom Tolton
Date: 8/3/2009 7:01:18 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Fuel Consumption Performance
 
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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