RE: cub ground roll
The cub ain't the only plane that's nasty to take off.
Tower has an entire line of very small World War I fighters, or scouts as they called them back then. They all are tail draggers and they've got TAIL SKIDS instead of tail wheels. They got big wheels for their size, they're too far back, and they're too close together. You will NOT get one of those suckers off the ground for more than 10 seconds if you try a slam-and-pray kind of takeoff.
One flying field has geomat runway for the electrics. It's excellently smooth. Point one into the wind, start it taxiing, then give it one or two clicks, the one or two more, then wait a second and pull a touch of elevator and up up and away. It works every time. And the take off looks as steady as the full scale takeoffs and just as real.