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JamesB
Unregistered
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 Posted Friday, July 24, 2009 @ 12:04 PM
I recently finished a trip from Washington State to Ohio and back again, solo, in my RF5B. About 3-4 days flying each way, over the Rocky Mountains.
I put a description about it with photos on my website (www.rf5b.com) Flights > Journey to Springfield.
Overally, despite the engine seeming to run too rich most of the time, I averaged 89mph (based on GPS logged distance & tach hours) at 27 mpg.
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jb92563
Unregistered
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Posted Friday, July 24, 2009 @ 01:37 PM
I'll have to check that out....thanks for documenting it, we enjoy reading trip reports.
I had a question about your RF5.
Does it use the Limbach L2000 engine?
I was wondering if it had dual Stromberg carbs like my Grob 109 has on its L2000 Limbach?
Apparently they are altitude compensating and lean the mixture when above ~5,000' msl.
[Edit by jb92563 on Friday, July 24, 2009 @ 01:47 PM]
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eugenio
Unregistered
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Posted Saturday, July 25, 2009 @ 08:16 AM
I think James' engine is a 1700, in any case the configuration is the same on 1700 and 2000. The carburetor's position and number depends on the model. L1700 and L2000 EO1 or EO2 means the engine is a 1700 or a 2000 with single rear low mounted carburetor, rear starter and generator. It is installed mainly on Fourniers and some ultralight (in the US LSA). (1 means that has the small prop hub for variable pitch prop, 2 is for the wooden fixed pitch prop)
The G109, like the HOAC Dimona and other fiberglass motorgliders install the L2000 or L2400 EB1 that means the engine is a 2000 or a 2400 with dual carburetors rear high installed, with rear mounted starter and generator.
The SF25 install a L1700 or L2000 EA1 or EA2 that means iy has rear high mounted single carb with starter and generator in front.
Finally the L1700 EAA is the engine prepared for the RF4 is like the EA2 but with single mounted low rear carburator like the RF5.
L2000DA2 is the dual mag dual carb engine made for the Robin ATL.
Accessories like carbs starter etc are the same for all engines.
Zenith-Stromberg carbs, like the Bing and similar kind of carbs are altitude compensating because compare outside pressure with manifold pressure via the membrane/piston system. Soon I will prepare an instruction leaflet like I did for the Zenith 20RXZ.
Eugenio
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JamesB
Unregistered
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Posted Sunday, July 26, 2009 @ 10:19 PM
| Quote: | | | Originally posted by jb92563
...Does it use the Limbach L2000 engine?
I was wondering if it had dual Stromberg carbs like my Grob 109 has on its L2000 Limbach?
Apparently they are altitude compensating and lean the mixture when above ~5,000' msl.
[Edit by jb92563 on Friday, July 24, 2009 @ 01:47 PM]
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My RF5B has a 1700E with the 3 position Hoffmann prop. At last rebuild, we used 90.5 Mahle pistons & cylinders -- so the displacement is 1776 -- close to the 1800cc it should have with the Hoffmann.
It does have a single Stromberg 150CD carburetor. It seemed to run rich during most of the trip at high density altitudes (often in the 6,000-9,000' range). We had just rebushed the throttle shaft on the Stromberg which may have thrown the mixture off (as the mixture had been set with the additional air coming past the worn carb body).
On the trip, I adjusted the floats to lean the mixture a bit. Although that helped, I don't consider that a fix.
Regardless of its seeming to run rich, the average fuel consumption for the trip was 3.27 gph at mostly 2,700 - 2,800 rpm. But the exhaust and plugs were black. I think it should have done better and can do better. Back in the Seattle area now, essentially at sea level, the mixture looks better. But I think the carb should be rebuilt this winter. I have the newer version that has fewer user adjustments. So, it's not as easy to dial in like Collin's.
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