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Old 11-25-2003, 10:00 PM   #1
Chris Cann
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LA engines

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are the lower LA engines the same as the higher one like 40s or are the lower ones like 25's better?
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Old 11-25-2003, 10:54 PM   #2
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Old 11-25-2003, 11:35 PM   #3
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Chris .... I think what Cecil is trying to say is ...... Huh?!?

LA's come in 10 to 65 size as I remember, and everywhere in between.

If you are asking are they as strong as other engines of the same size, Personally I would have to say no.

They are reliable but not power houses. HTH
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Old 11-26-2003, 05:58 AM   #4
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If memory serves , the LA engines are bushing equipped. Usually bushing (or plain bearing) engines do not make as much power as the same sized ball bearing ones.

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Old 11-30-2003, 11:38 AM   #5
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Ok sorry but i never got the little yellow icon saying that there's new posts anyways the reputation for La engines are that they are sluggish but i have heard on the SPAD forum and a little bit on RCU that the lower LA's like the 25's do not fallow the same reputation as the higher ones like the 40's and the 46's So I was wondering if anyone can say thats true or not!
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Old 11-30-2003, 01:09 PM   #6
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You get what you pay for.........the LA series are low priced ,low stressed ,easy starting bushing engines,not intended for top performance.I have a .40 and like it but it does not perform with most BB .40s
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Old 11-30-2003, 10:06 PM   #7
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Yup agree with the guys who say LA's are ment for SPORT flying. Combat dudes want like the old TV show "Home Improvement" MORE POWER. But you can easily get better RPM out of a LA .15 by #1 remove the middle baffle from the muffler and #2 Bore out the end pipe of the Muffler. I get great performance on my .15 size RV-4
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Old 12-01-2003, 08:58 AM   #8
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As stated already, The LA series is no the most powerful motor out there, but by next winter I should be ready to mount engines in my Lancaster. I'm going to use the LA .40 because it is reliable. Maybe not the most powerful engine out there but in a multi engine plane you want reliablity. I have a pair of OS .61's going into my avro anson sometime in the spring, if I can get my Waco painted and finished first.
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Old 12-01-2003, 05:17 PM   #9
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The biggest thing about the LA series engines is that they have true "Schneurle" porting. They have two fuel trasnfer ports in the sleeve, There is no third "Boost" port opposite the exhaust port like most engines. Most manufacturers machine this third port to give very good high speed running characteristics. OS realized that an R/C sport engine didn't require this third port, less machining less cost to the consumer. Also in the Control line side of the hobby, it was discovered that the engines spun bigger props more reliably in this configuration "This is due to the fuel transfer from the crancase to the combustion chamber is more vigorous than with three ports for the fuel to blow through". As a result, most control line engine rebuilders block off this boost port in the crank case with JB weld as a part of the "rebuild process" and drop or raise the sleeve depending upon what you are going to use the engine for.
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Old 12-01-2003, 05:23 PM   #10
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I love my LA 15. It is a sweet, sweet engine.
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