FWIW, I just ran one of the two new Tower .46 I bought for the Phoenix Sukhoi and Giles. On the test bench, after about 30mins of ON-OFF break-in, it managed just shy of 13,000rpm with an APC 10x6 on 10% nitro 20% oil. I stopped at a few clicks on the rich side, so it will probably go anther 2-300 rpm, if I pushed it. I don't think it's fully froken it yet, but I will break-in the rest of the way flying.

The engine was VERY tight brand new. I had to put the Tower HD starter on 24V to crank it over. So far it has been a good runner, powerful with a very low and steady idle - 2000rpm with a 11x5 APC. We'll see how it does in the air.