ORIGINAL: Red B.
In most applications a Saito 82 will significantly outperform the OS46AX simply because it provides more power at the RPMs we are typically operating our engines at.
/Red B.
Do you have the numbers for that? What is the difference in power?
This comparison is exactly what should always be done when shopping for engines. The Saito's are known for their power/weight performance. And some sizes of engines are perfect for the type engine in question. For example, the 1/2A engines are so small that they are hard to keep hot enough to run with power unless significantly high nitro fuel is used. And for years, 40-45 size engines were considered the perfect balance for 2C model engines' for power output and weight of the engine. But keep in mind that the weight of an engine also does good and bad not only for it's use to balance your airframe, but also for the power output and longevity of the engine.
Whenever you search for the right engine, there are more details to consider than just one or two.