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Model Forum / Radio Controlled / Air Models / July 2004Ball bearing problems
I like flying with small acro trainers. I used a OS 50 SX for several months on a Soprano (1,55m - 2,6 kg - APC 12 x 6 - Cool Power 15 % Nitro) with great satisfaction. Suddenly the engine lost some power. Reason : several balls in the rear ball bearing where damaged, and the particles did ruin the engine. OS (Graupner Germany) accepted no warranty. I replaced the OS by a Magnum XLS 46. Performed well after runnung in. A few weeks later : sudden power loss and same story as above. Chrome did come apart of the balls of the rear ball bearing. As far as I heard, this happens very seldom. Can there be a common reason ? Thanks for anny comment. > I like flying with small acro trainers. > [quoted text clipped - 13 lines] > > Thanks for anny comment. 15% nitro runs hot. Were you running your engines too lean? The chrome plating either got too hot, or you got hold of defective engines. >> I like flying with small acro trainers. >> [quoted text clipped - 15 lines] > chrome plating either got too hot, or you got hold of defective > engines. The last I heard, Cool Power used about 16% all-synthetic oil. Your 2-stroke engines are probably better off using fuel containing at least 18% oil with at least a small amount being castor oil. The castor oil adds a margin of safety in case of a lean, too hot run. Jim - AMA 501383 you should only be running 15% in high performance or cold weathe applications. with a trainer type of aircraft you only need 5% and tun it a little rich on the ground as it will lean out once you ar airborn -- papama MAYBE NOT ENOUGH LUBE IN THE COOL-POWER FUEL ( or maybe no lube ) Run the engine slobbering rich and check for oil-residue from muffler You'll see the proble -- hall wo This seems to be more and more common with engines running Cool Power. I just sold 4 sets of ceramic bearings to some heli fliers using the OS 50 SX-H engines who had exactly the same problem. My advice would be to make sure you use a rear bearing with a high speed plastic retainer and run a fuel other than Cool Power. -- Paul McIntosh http://www.rc-bearings.com > I like flying with small acro trainers. > [quoted text clipped - 13 lines] > > Thanks for anny comment. the 50 sx is a ringed engine....unlike the abc engines that must be run in 2 cycle to come up to temp for proper piston cylinder fit a ringed engine should be broke in 4 cycle at first then after a few tanks to 4 cycle breaking into 2 cycle (plenty rich) I suspect a lack of lube and a 12 x 6 prop seams to be on the large side (too high of load...too much heat) for this engine it might be ok after breaking in on a smaller prop, by running a smaller prop for break in it will run at a higher rpm and what comes with that is a lighter load with more fuel that come with more oil which carries away the heat as well as more lubrication I have read the Os manual and see that they recommend a 12 x 6 but personal experience with my 50 sx has shown that a 11 x 6 is a much better choice for this engine... mine is 3 years old and I have run 11 gallons of power master 15 % thru it and it still has original bearings and is still as strong and smooth as ever....I ran the first 3 tanks in full 4 cycle then the next 5 in a 2 - 4 break and since then in a semi rich 2 cycle all with apc 11x6 > This seems to be more and more common with engines running Cool Power. I > just sold 4 sets of ceramic bearings to some heli fliers using the OS 50 [quoted text clipped - 24 lines] > > > > Thanks for anny comment. This is speculation on my part, but it appears that you are in Belguim, so do you perchance have engines designed for use with 0% nitro, which will have higher compression than an engine designed for nitro? 15% nitro in a high compression engine swinging a large prop, and using inadequate oil in the mix is bound to spell disaster. Paul McIntosh, you surely know whether OS and Magnum suppliy European engines with higher compression than US engines. Let us know! Geoff Sanders They are all the same. Many of the Brits complain about the performance on low/no nitro fuels with the Japanese and Chinese engines. Many of them are now seeing that the engines are designed for the mass market (US). -- Paul McIntosh http://www.rc-bearings.com > This is speculation on my part, but it appears that you are in Belguim, so do > you perchance have engines designed for use with 0% nitro, which will have [quoted text clipped - 6 lines] > > Geoff Sanders Therein lies the difference. You used Powermaster which has a very good lube package. -- Paul McIntosh http://www.rc-bearings.com > the 50 sx is a ringed engine....unlike the abc engines that must be run in 2 > cycle to come up to temp for proper piston cylinder fit a ringed engine [quoted text clipped - 41 lines] > > > > > > Thanks for anny comment. Just another thought. If the chrome came off the balls, they you have a real big problem! The balls are solid chrome-steel, not plated! -- Paul McIntosh http://www.rc-bearings.com > I like flying with small acro trainers. > [quoted text clipped - 13 lines] > > Thanks for anny comment. |
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