As much as I like Supertigre engines, I personally thought an LA .40 was more than enough for the Avistar, especially if you're just starting out. The plane balances perfectly with the LA, with a ST you'll have to move the batteries behind the radio compartment. I re-learned on an avistar with the LA, it was perfect, and I never thought the plane was underpowered. But I bought a S-T GS 40, and down the road a way I mounted it. Not screamingly fast, but definetly more vertical.....


Andy