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  #11  
Old 01-25-2014, 01:10 PM
diamond diamond is offline
 
Join Date: Sep 2009
Location: Rochester, MN
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150 mph? That's just a few ticks shy of Vne. Do you RV12ers routinely fly that fast?
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  #12  
Old 01-25-2014, 01:36 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by diamond View Post
150 mph? That's just a few ticks shy of Vne. Do you RV12ers routinely fly that fast?
I think Scott probably did it for a short period, for data comparison only.
Max continuous RPM on teh Rotax 912 is 5500, so typical max true airspeed is usually in the 135 - 140 MPH range.
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  #13  
Old 01-25-2014, 01:51 PM
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az_gila az_gila is offline
 
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At max continuous rpm, it's at 24.5 mpg at 140 mph on Scotts chart.

Still quite amazing in automotive terms.
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  #14  
Old 01-25-2014, 01:54 PM
NASA515 NASA515 is offline
 
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Roger all of the above.

Bob
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  #15  
Old 01-25-2014, 01:58 PM
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DonFromTX DonFromTX is offline
 
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I thought people on the ground comment that someone is flying a sewing machine! Then again maybe I was wrong.
Quote:
Originally Posted by gblwy View Post
Well, for an ex-Lycoming driver it's much too fast in any currency ;-)

Having said that I wouldn't swap my engine - starts in a heartbeat, sounds fine in the cockpit, and people on the ground have commented how quiet the plane is in the air.

Cheers...Keith
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  #16  
Old 01-26-2014, 11:20 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Scott, that's interesting. My flying in AZ is done anywhere from 4500 to 12500 Ft, and I don't think I've ever seen an average fuel burn over 5 GPH. I usually cruise at 5300 RPM, and most flights are at least two hours.
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  #17  
Old 01-27-2014, 11:11 AM
664781 664781 is offline
 
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Location: Powder Springs, Ga
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Default Fuel Burn

My longest leg flown was 3.3 hours at 5000 ft and 5100 RPM. Added 14.6 gal, and was full when I left. Temp was -7C when I took off and 0C when I landed. Fuel Flow was showing right at 5 GPH so need to tweak the K factor one more time.
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  #18  
Old 01-27-2014, 11:44 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Keep in mind that actual power produced is a function of both engine RPM and manifold pressure. The two together correlate to a specific fuel flow.
So, considering that RV-12's have ground adjustable props, stating that I get X fuel flow at Y RPM doesn't tell the whole story, without also giving manifold pressure. Prop pitch can have a big influence on what the fuel flow Vs RPM ratio is.
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  #19  
Old 01-27-2014, 11:54 AM
RFSchaller RFSchaller is offline
 
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True, Scott, but for planning purposes on a long cross country 4.5 GPH seems to work out within a few tenths of a gallon. The few 12 owners I've met at the airfield say that's what they are seeing too.
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  #20  
Old 01-27-2014, 01:43 PM
yankee-flyer yankee-flyer is offline
 
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Location: Dayton, OH
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Default Fuel burn

My fuel burn is pretty consistently 4.3 - 4.4 gph at 5200 rpm and 110-112 knots. I flight plan for 4.5 and have never had any problem with that in 225 hours

Wayne 12041/143WM "Little Bird II"
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