The OS LA series
Hi!
I have had both the FP and LA series OS engines and help friends in my club with the LA (.15.25.40.46 and .65) and all have been very good performers.
I have not discorvered any different behavior from these than the OS Fp series......That means perfect throtteling ....super reliable...and good performance.....provided you use a good prop (APC).
For instance in my Kyosho PBY Catalina flying boat I have two of these OS .15 LA ..and they turn 8x5 APC props at more rpm than I have need for in that model (only at take off from water do I use full power). I think the engines turns these props at more than 13000 rpm, I haven't checked top rpm) I set the engines fairly rich at 12500rpm so I can fly safely without having them quit on me.
As for trhe .40 and .46 LA in a trainer aircraft I do recommend a 11x6 and a 12x4 APC for these engines ( at sea level) because they can turn these props a low noice levels and give much bettetr flightperformance than the usual 10x6 can.
Good engines!
Jan K