I currently fly Virgil Wilbur's very old MO-1 in profile carrier with a OS-35FP, very slow by Nelson standard but I have no interest in buying a Nelson. I normally fly CL scale and only pull out the MO-1 for local contests now once a year.
I have tried other engines but always end up putting an OS glow engine on the model. I have 9 flyable models, 6 for CL scale (5 glow powered, 1 electric), 1 carrier with an OS-35FP, and 2 for sport flying (1 glow, 1 electric).
The Cub has a Thunder Tigre and I like that brand, it does not give me any problems
The rest of my fleet is powered by OS glow engines (OS FP series)
My FP engines start everytime and run great, maybe not a speed demon but I don't fly carrier to go fast.
Fred C.