REFLECTOR: Best Speed for MPG

Brian Michalk michalk at awpi.com
Wed Aug 14 10:18:06 CDT 2013


Do you have indicated airspeed at those settings?

On 8/14/2013 9:00 AM, Scott Derrick wrote:
> My best is up high. 18,000 ft, 10.5 GPH 180KTAS.
>
> At 12,500 ft a more common place for me to cruise, 12 GPH at 175KTAS.
>
> At 4,000 ft I'm up to 13.5 GPH at 175KTAS
>
> Scott
>
>
> -------- Original Message --------
> Subject: Re: REFLECTOR: Best Speed for MPG
> From: Ron N VelocityXLFG <velocityxl at fastmail.fm>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Date: 08/14/2013 07:52 AM
>
>> I have read  that some where also and the argument makes sense that the
>> engine is nothing more than a air
>> pump. So you do not want to restrict it. Though it seems there should
>> also be a sweet spot where the
>> aerodynamic is more important that the throttle position.
>>
>> On 8/14/2013 7:59 AM, Brian Michalk wrote:
>>> The engine runs most efficiently at wide open throttle and low RPM.
>>>
>>> If you can regulate power with altitude, fly high at WOT.
>>>
>>> On 08/14/2013 07:51 AM, Ron N VelocityXLFG wrote:
>>>> I was wondering what the best speed per gallon of gas  has been in
>>>> the velocity.
>>>> I have been doing some  work on this lately . Now my plane having a
>>>> alternative
>>>> motor and a fixed pitch prop will likely not be the same as other
>>>> installations but
>>>> with that said I still would like to know what Speed other velocity
>>>> pilots are
>>>> finding for the best fuel mileage  has been.  I feel most comfortable
>>>> at 145 knots
>>>> seems to be the sweet spot for me so far but that is also my comfort
>>>> zone for the engine
>>>> rpm on my fixed pitch propeller. Now this is only about Half throttle
>>>> for me wide
>>>> open I get 175 knots Or should I say 201 MPH  but I am sure my
>>>> mileage will go way down at the speed.
>>>>
>>>>
>>>> So far for me with only a few cross country's under my belt
>>>> Velocity XLFG LT1
>>>> Prop RPM 2500 Prop tip speed 535 mph
>>>> Prop Dia 72"
>>>> At 4500 alt
>>>> 2600 gross Weight
>>>> Speed of 143 knots
>>>> 280 mile round  trip
>>>>
>>>> I got 12 gallons an hour
>>>> fuel burn
>>>>
>>>> Ron
>>>> _______________________________________________
>>>> 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
>>
>> _______________________________________________
>> 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