G'day

My vote would go to the OS LA 46 too for several reasons.

1. Trainers tend to have tough lives and a bushed engine will survive being banged into the ground better than a ball raced engine. A bit of a cleanup and they are ready to go again.

2. The LA series are the latest in a range of plain bearing (bushed) engines that OS has been making since the 1940s. They are direct descendants of the MAX engines that were so popular in the 1950s and 60s. OS really knows how to build a quality simple engine.

3. OS's simple air bleed carby is about as good as a simple carby gets. They really are "set and forget" devices.

4. They are cheaper.

If you run it slightly rich and use a fuel with castor oil in it (the more the merrier) it will last for ages. And it does not need more than 10% nitro either which makes your fuel cheaper.

I had an LA 46 in a World Models Skyraider Mach 1 some years ago. I rarely got to fly it because the club president loved to borrow it to give newcomers a fly. I later put the engine in to a World Models Super Stunts (Stick) and it was great there too.