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From: "Mike Wills" <rv-4mike@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-4218930@logan.com>
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Subject: Re: [FlyRotary] Re: Fuel Burn Rate
Date: Tue, 13 Apr 2010 19:14:50 -0700
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My experience so far with about 30 hours on my RV-4. All fuel flow numbers 
are from the EFISM which so far seems to be pretty accurate. During full 
power takeoff and initial climb (525' MSL) I see about 16GPH. At 8000' and 
full throttle with the mixture monitor registering mid range I see about 
9.4GPH. Same altitude and throttle setting but leaned somewhere around 100 - 
125 LOP I see about 8.2GPH. At this setting I'm cruising at approx 180MPH 
true. Compare that with 7.8GPH and approx 170 true that I used to get at 
cruise in my former airplane, an RV-6A with 160HP Lyc and fixed pitch 
Sensenich metal prop.

I'll probably be doing a lot more tweaking and learning as time goes on, but 
as of now the RV-4 appears both faster and thirstier than the -6A was.

For info, the engine is a 13B normally aspirated with NA rotors and turbo 
housings (no exhaust splitters). The PSRU is Tracy's original RD-1 with 
2.17:1 ratio and the prop is a wood Warnke. Currently appears that I am 
under powered/over propped slightly. There may be a new RD-1C and prop in my 
future somewhere down the road.

Mike Wills

--------------------------------------------------
From: "David Moyer" <davidm@remconinc.com>
Sent: Monday, April 12, 2010 12:40 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Fuel Burn Rate

> Pretty impressive burn with the turbo. Finishing up my PPL this and next 
> week, just getting excited about getting my Cozy finished up and flying 
> it.
>
> -- 
> Cozy MK-IV (Still Building) Come on already!!! Itching to fly this bird.
> Turbo Rotary
> Houston, TX
>
>
> On 4/12/2010 1:47 PM, John Slade wrote:
>> Hi David,
>> I tend to leave my EM2 set to show mixture and must admit I don't pay 
>> much attention to fuel flow. If the engine's running smoothly and the 
>> mixture's in the middle the fuel flow (shown by the EM2) isn't going to 
>> tell me much. The few times I checked I think it was showing anywhere 
>> between 7 - 8 gph at a gentle cruise and 13 or so at higher throttle 
>> settings.  I don't think I've ever checked it on take-off  (too busy 
>> watching temps and mixture). I usually flight plan for 10 gph and that 
>> seems to work out fairly well. If I ever get to less than 5gals in either 
>> side I consider it time to land and get fuel.
>> Regards,
>> John
>>
>> David Moyer wrote:
>>> Just fishing for some fuel burn rates that every one has been seeing.
>>>
>>> John Slade, curious what kind of burn rate you are seeing with your 
>>> setup as mine will be very similar.
>>>
>>
>>
>> -- 
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub: 
>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub: 
> http://mail.lancaironline.net:81/lists/flyrotary/List.html