the ST2300 is a 31 oz with 3.7hp, very close to the OS160fx, the ST3000-3250 is a 48 oz engine with 3.2 hp......do the math.


I think the ST3000 is a great running engine, but it designed back when engines needed to be heavy to balance a plane, today the planes are built to the engines that exsist, a ST2300 with the throttle servo mounted on the box would make you a happy guy!


Take a close look at the moki 1.80/2.10, kind of heavy too for a 73" plane, they do have great power, but the moki 135 is more in the wieght range that you are looking for.

Dave patrick has a 78" extra with a ys 140 four stroke for power, the plane weighs in about 12.5 lbs and will do EVERYTHING a TOC plane will do, at scale speed!


I have a H9 pizazz that was designed for a 16 oz .46 engine, I have a 25 oz .68 engine in it....why? Because it would not hover or do flat spins.....see this plane flys off the prop, it does the moves, they just do not look "scale" does a blender so fast it looks stupid!


I hope this makes sense for you......If you have not noticed the market has shifted to 78-80" for this size flying, planes like the 80" 19lb midwest extra are a thing of the past. I use my 300xs to fly early in the season, when it is a little wet....after I have flown the .40 size for a week. The plane helps me get used to "landing" the bigger ones, it really does look a lot different on approach. The light wing loading also gets me warmed up for the hotter planes. Fly this plane and learn 3d! then get your self a GP PW extra 300, DP extra of edge 300 or a H9 80" cap 232.......or just go on to 33-35%, that is my next stop!