MTK,

Have You noiticed any vibration related problems on the plane itself or the equipment (servo wear for example) with Gas engine in your pattern plane(s)?

There is a new OS Gas Engine, GF40 (40 cc) - what do You think about such engine in a 2M pattern plane?
GF40 almost twice ($800) as expensive then GT33 ($420) and is little heavier also (1170+113+95=1378 grams compared to GT33 984+160+105=1249 grams) so the price gap is a big disadvatage. But if we disregard the price, is it suitable for F3A flying do You think?

What pipe are You using on Your OS GT33?

/Bo