REFLECTOR: Best Speed for MPG

[Scott Derrick]

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
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-- 
While I see many hoof marks going in, I see none coming out. It is 
easier to get into the enemy's toils than out again.
Aesop