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Engine basics => Engine set up tips => Topic started by: Kim Mortimore on August 25, 2012, 07:08:24 PM
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I'm flight-trimming a very nice Imitation (the best plane I've flown) powered by an (inverted) LA46 with a stock E-2030 muffler. The engine runs nicely and hauls 59 oz well (somewhat to my surprise), but wiping off all that goo after each flight gets old. I know that muffler extensions like the Dubro increase back pressure. I'm wondering what would happen if I could rig up an extension in either a megaphone or cylindrical shape with the a max diameter of say 3/4". How would that effect back pressure? It would need to be a soft material (maybe molded rubber) in case of contact with obstructions at our grass field. The stinger is too thin to ream out. Thanks. To answer in advance any smart-alecs who say "go electric," I quote Ted Fancher: "Bah! Humbug!"
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Just wondering what fuel you are using....possibly all castor ? I have been using Sig Champion 5 or 10% nitro ( the oil is 1/2 castor & 1/2 synthetic ) and I have very little goo after a flight....I am using a Randy Smith tube muffler
but I don't think that has any bearing on oily exhaust.
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Gene,
Sig Champion 10%. What plane are you flying? Maybe the design is such that the muffler doesn't "aim" at the wing or fuse, or you used Super Duper Magic Oil-Deflecting Paint? LL~
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There are at least two, maybe 3, different sizes of rubber duckys. I'd put on the biggest one I could make stay put and not worry about backpressure. You might experiment with cutting one shorter. FYI, DuBro's are made in China, as are Hobbico/Great Planes. Thunder Tigers are made in Taiwan, come in chic colors, and are cheaper than the DuBro's, and maybe cheaper than the others, but it's been awhile. H^^ Steve
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Current plane with LA46 is a Midwest Magician. I do get some oil residue but I wouldn't classify it as gooey...probably
just a different perception on my part. I would try Steve's suggestions. Best of luck to you.
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Gooey planes is simply a fact of life! Even with my rear exhaust engines (RO-Jett, Stalker) oil gets all over, except now it is on the bottom instead of the top.
Floyd