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10-07-2014, 12:53 PM
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Join Date: May 2010
Location: Kokomo, In.
Posts: 109
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RPM for Rotax RV-12
what rpm and fuel used per hour for a rv-12 with rotax power
on cross country flights by most pilots?
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10-07-2014, 06:24 PM
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Join Date: Sep 2013
Location: Tucson, AZ
Posts: 322
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most seem to use 5100-5400 and use from 4.5 to 5.5 gph. I tend to be around 5200 and seem to get right at 5 gph.
This can vary a tad from engine to engine and individual users. Then you have each persons personal preference.
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Roger Lee
Tucson, AZ
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10-07-2014, 07:10 PM
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Join Date: Sep 2012
Location: South Coast, Australia
Posts: 22
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I can't speak for RV-12's in particular as I don't fly one, but in the range of similar aircraft I fly that are powered by Rotax 912, as per the Rotax Operation Manuals, 4800-5200 is the optimum operating range.
I usually see 15-18Litres/hr (4 US Gallons per hour/4.7 US Gallons per hour) and I try to stick more to the lower-middle range around the 4800-5000rpm mark.
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Cameron
RV-3B (Building... slowly... very slowly  )
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10-07-2014, 07:42 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,818
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5100 RPM and 20" MAP GIVES ME 4.5 GPH.
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10-08-2014, 05:18 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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Rotax says run them. Fuel flow will depend upon altitude. I always run at 5400 RPM and see between 4.7 and 5.2 GPH.
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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10-08-2014, 06:41 AM
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Join Date: Mar 2013
Location: Iowa
Posts: 161
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The suggestions to operate around 5200-5400 are assuming the prop is pitched for WOT at cruise altitude is least 5500 and more likely 5600 or even 5650.
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10-08-2014, 08:44 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
Originally Posted by jnmeade
The suggestions to operate around 5200-5400 are assuming the prop is pitched for WOT at cruise altitude is least 5500 and more likely 5600 or even 5650.
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On an RV-12, if the prop pitch is set properly, the WOT RPM at lower altitudes will easily exceed 5500.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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