OS LA Series Problems?
04-16-2003 | 11:30 AM
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From: Bisley, UNITED KINGDOM
OS LA Series Problems?
I have an OS 46LA installed in a WOT4 that has never worked particularly well. The engine tunes beautifully whilst attached to terra firma, but once in flight for approx. 5 minutes it's revs change from low to high and a short while later the engine cuts out. I have heard (through my local club) that there has been trouble with some LA series units experiencing an expansion of the liner as the engine heats up. Could this be related to my problem? If so how do I go about getting it fixed?
Chocky.
Chocky.
04-16-2003 | 02:23 PM
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OS LA Series Problems?
Chocky,
If your engine will run "all day" when it's on the ground, either in a model or on a test stand, then there's nothing wrong with the engine. If the problem happens onlyl in the air, then the problem source is somewhere in the airframe/fuel system/mount/engine combination.
Usually, vibration-induced fuel foaming is the most common reason an engine will run for a while and then quit. It's overheating from being too lean. The fuel's not affected when the model's on the ground because your hands and the ground restrain the vibration modes of the model.
If the engine won't run right on a test stand, then it needs to be carefully checked to see what might be wrong.
The O.S. Max LA-series engines don't have any particular problems inherent to them. If the piston/liner fit has become loose, it's most likely that the engine's had an overheat at some time. Since your engine's quitting shortly into a flight, that's likely. Locating the cause can take some detective work.
If you believe the engine, itself is at fault, please send it to us for inspection/
If your engine will run "all day" when it's on the ground, either in a model or on a test stand, then there's nothing wrong with the engine. If the problem happens onlyl in the air, then the problem source is somewhere in the airframe/fuel system/mount/engine combination.
Usually, vibration-induced fuel foaming is the most common reason an engine will run for a while and then quit. It's overheating from being too lean. The fuel's not affected when the model's on the ground because your hands and the ground restrain the vibration modes of the model.
If the engine won't run right on a test stand, then it needs to be carefully checked to see what might be wrong.
The O.S. Max LA-series engines don't have any particular problems inherent to them. If the piston/liner fit has become loose, it's most likely that the engine's had an overheat at some time. Since your engine's quitting shortly into a flight, that's likely. Locating the cause can take some detective work.
If you believe the engine, itself is at fault, please send it to us for inspection/
04-16-2003 | 06:46 PM
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From: Bisley, UNITED KINGDOM
OS LA Series Problems?
Bill,
Many thanks for your advice. I must admit that other than at the early running in stages I haven't had the engine running for any length of time on the ground since. I'll be sure to give that a go. I'll also review the way that the fuel tank is mounted before packing it off for any investigative work. Don't think that I'll send it to you though as I live in the UK! Do you know who the distributor is for OS Engines this side of the Pond? Thanks again for your time.
Chocky.
Many thanks for your advice. I must admit that other than at the early running in stages I haven't had the engine running for any length of time on the ground since. I'll be sure to give that a go. I'll also review the way that the fuel tank is mounted before packing it off for any investigative work. Don't think that I'll send it to you though as I live in the UK! Do you know who the distributor is for OS Engines this side of the Pond? Thanks again for your time.
Chocky.
