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>> That engine can be operated on premium automotive gasoline, too.
>> The poster listed a 150 HP RV-9, which could burn mogas Curious, where does this information come from? From what I've seen on Lycoming's website, they say nothing but AVGAS for all their engines. How does one know whether you can really safely run MOGAS in these engines? >> Consider this. Go ahead and put the 160 HP Lyc in and when prudent throttle back to a fuel burn of the 118 HP engine Be interesting to see how the consumption rates compare for the two engines running at the same speed, say 150mph. The 160HP would be going that speed at a lower power setting, but it's a bigger engine overall. I wonder how close the GPH would be between the two engines running at the same speed (150MPH). |
Weather factor
I have had to park my plane (twice ) in bad weather and take the Greyhound home. No fun at all. Then I had to arrange to get back and retreive the plane. The saying goes, "When you have time to spare, go by air". I never leave home without bus fare. Having said that, I have made seven trips from Salem Oregon to Southern California in my RV and it's far better to fly than drive.
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If you come across some reliable performance numbers for an O-235 equipped RV-9, compare them to the Cafe Foundation report on the O-320 powered N129RV. The O-320 -9 will at least match the O-235 for efficiency in most situations. |
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1. smaller displacement means less frictional losses to turn it at a given rpm, 2. the throttle will be further open than the one on the larger engine, leading to lower pumping losses, and 3. the aircraft with the smaller engine should be a bit lighter than the one with the larger engine. The lighter weight should mean a bit less induced drag. |
(disclaimer) I'm only repeating what I have heard about the 118 hp gph.
I have been told that the 118 hp engine uses about 5 - 6 gph in econ. cruise. According to Van's (and I think their numbers are pretty accurate) that would have you zooming along at 150 mph. The biggest draw back for flying to visit relatives and such is ground transportation. Yeah, they can pick you up and drop you off but I would rather rent a car. Of course the "Wanna fly in my plane?" usually gets instant cooperation from anyone. If your trying to save money by flying instead of driving - you might actually come out better going commercial. HOWEVER! Getting in YOUR plane and flying yourself to whatever destination you desire brings into light the COOL factor. The COOL factor outweighs any and all cost or time considerations. |
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Robert, where in SC are you located? |
I've never lost my luggage when I'm the pilot.
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That definitely says it all
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Back to the small engine debate: Wouldn't an RV-9 with an O-235 at 118 HP still use close to the same amount of gas as a 110 HP Cessna 152 at any given RPM? |
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