REFLECTOR: Fuel Consumption Performance

Fri Aug 28 13:55:17 CDT 2009

Nope.

Scott Derrick wrote:
> Chris,
>
> That coolant injection system of yours.  Was it modeled after the WWII
> plane's systems for max power?
>
> Scott
>
> Christopher Barber wrote:
>   
>> Go Al Go!!!!! I agree with ya buddy. I am making some real progress
>> with my 2 rotor. Now that I not trying to tune it with coolant in the
>> combustions chambers, things seem to be coming together MUCH better <g>
>>
>> Right now my potential airplane is kinda of kewl as a REALLY expensive
>> "go-kart" taxiing around the airport :-) I am making a lot of "proof
>> of concept" stuff into flight ready. Kinda scary ;-0
>>
>> All the best,
>>
>> Al Gietzen wrote:
>>     
>>> Terry;
>>>
>>> Good numbers. They are a bit lower than you previously reported, and
>>> right in line with what I get with my rotary.
>>>
>>> There was some discussion awhile back on another list about slowing
>>> down and reducing the cost of flying. I’m thinking- wait a minute;
>>> one of the reasons I have an airplane is to go fast. I can make a 500
>>> nm leg on about 28.0 gals of fuel at 170 KTAS. If I slow down to 150
>>> I can save about 1 gal, and take over 20 minutes longer. The cost of
>>> that gas (especially mogas at $3.00) is completely negligible
>>> compared to the overall cost of having an airplane. I think I’ll
>>> start flying at 190 J.
>>>
>>> Al
>>>
>>> -----Original Message-----
>>> *From:* reflector-bounces at tvbf.org
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Terry Miles
>>> *Sent:* Thursday, August 27, 2009 10:00 AM
>>> *To:* 'Velocity Aircraft Owners and Builders list'
>>> *Subject:* Re: REFLECTOR: Fuel Consumption Performance
>>>
>>> Al,
>>>
>>> Here is my cruz engine log to include this last IN to CO trip.
>>> Westbound was full power. 10,000 will get me mid 180 Kts TAS and
>>> 12,000 gets mid 190 kts TAS. That runs about 11.5 at full throttle
>>> and leaning 50 LOP. Thanks to Scott I did it right and pulled the
>>> mixture out until they were all LOP and enriched back on the first to
>>> peak so to get 50 LOP. It was hardly any real effective difference,
>>> but better to do it right. (And I never got to KLMO when I was asking
>>> about high dens alt ops.)
>>>
>>> As the log shows, on the way back at 11,000 I pulled back to try and
>>> hold mid 170's for speed, and I pulled the prop rpm back some too,
>>> but it doesn't sound good below 2100 for some reason. Anyway I was
>>> able to get 9.5 for a fuel flow. Next good tailwind and I'll try mid
>>> 150's for a speed.
>>>
>>> Also for what it worth for you other fellow newbies and flatlanders
>>> out there, I had it in my head and in my muscle memory that cooler
>>> temps mean more leaning since those are the mixture adjustments I
>>> have been making hundreds of times now. When I got out on the runway
>>> for takeoff run…I put the throttle in full, then I leaned the mixture
>>> leaning for peak…when I got to peak I instinctively _leaned _for the
>>> 100 cooler instead of enriching to get the 100 cooler. Of course I
>>> immediately saw this and fixed it, but I was surprized at myself…all
>>> while the engine is at full blast and my head is on the departure
>>> matters and checklists. Thought I'd toss that in. What not to do is
>>> often as good as knowing what TO do.
>>>
>>> Terry
>>>
>>> *From:* reflector-bounces at tvbf.org
>>> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Al Gietzen
>>> *Sent:* Wednesday, August 05, 2009 11:34
>>> *To:* 'Velocity Aircraft Owners and Builders list'
>>> *Subject:* Re: REFLECTOR: Fuel Consumption Performance
>>>
>>> Al,
>>>
>>> Hey thanks for that. Can I do anything to help fill in the matrix any
>>> better? I could get you some 165 TAS numbers on my next long trip. It
>>> seems like runs at similar altitudes and TAS would make for the
>>> easiest comparisons. But, I could fly at whatever altitude or fuel
>>> flow, etc you wanted to know about.
>>>
>>> Terry;
>>>
>>> I think I’ve gone as far as going with that – I was just
>>> tabulating/correlating the reported data for easier viewing. I’d be
>>> more interested in comparison data for alternative engines, although
>>> that then needs to be compared with the certified engines.
>>>
>>> I think each person should gather some data on their own plane, for
>>> their own purposes; starting with verifying the accuracy of the
>>> airspeed and fuel flow readings. Then it might be fun to compare some
>>> data for the same models at the same TAS at the same elevation.
>>>
>>> So if all you folks flying would, whenever convenient, like to post
>>> some data for your M&M and engine type at, say:
>>>
>>> Leaned cruise
>>>
>>> 150 KTAS
>>>
>>> 9500 ft;
>>>
>>> it would be interesting.
>>>
>>> Best,
>>>
>>> Al
>>>
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>>     
>
>   
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