REFLECTOR: Fuel Consumption Performance
Terry Miles
terrence_miles at hotmail.com
Mon Aug 3 21:00:10 CDT 2009
Tom,
I've got an XLRG-5 IO-540K 300 HP with a 3-blade constant speed ACI prop.
These numbers are about 2 weeks old. Same day taken only an hour or so
apart on the xc from PA to IN.
Altitude 10000 12000
OAT C +16 +12
TAS 193 195
IAS 160 157
FF 11.5 11.5
RPM 2330 2390
% pwr 64 62 wide open throttle
Oil T 192
Oil P 66
Cyl ave 300 25 hotter
EGT 1230 same
I lean until my first cyl is 50 lop and quit there. I can likely go to 11
gal.
I was about 2600 gross wgt at the time.
Terry Miles
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Tom Tolton
Sent: Monday, August 03, 2009 19:39
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Fuel Consumption Performance
Thanks Brian. I'll start looking for BSFC numbers. After posting my last
message I found an article where a LANCAIR with a 550N was tested to
determine the Vbc or velocity for best CAFÉ or best Comparative Aircraft
Flight Efficiency. At 12.5 K density altitude 2300 rpm and 248.3 smph they
were able to reduce fuel consumption to 10.4 gph LOP. Do you know if
Velocity has entered the CAFÉ competition?
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brian Michalk
Sent: Monday, August 03, 2009 8:16 PM
To: Velocity Aircraft Owners and Builders list
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)
>
>
>
>
> ----------------------------------------------------------------------
> --
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail Check old archives:
> http://www.tvbf.org/archives/velocity/maillist.html
_______________________________________________
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
Visit the gallery! www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
More information about the Reflector
mailing list