People are using Saito 56's, 72's, & Y-S 63's. The 56 should almost replicate your TT PRO 46. But the 3D hotdogs are using the bigger engines.

The OS 70 Surpass II has good power and friendlyness but is larger on the outside than the other engines. Some people use it though.

The OS 52 doesn't have the power of the TT PRO 46 and is better suited to a large wing - lite weight plane. Then you can have many hours of economical fun with one.

I have a couple Magnum 61's but they are not materially different from the 52.

Jim