My rule in the smaller planes is to NEVER use lead or heavy prop nuts.

Balance the finished plane with a heavy enough engine. Bigger, like 40 to 60% are a joy to fly on windy days.

LEAD is never a joy to fly.---------My way may not be for you.-----Yes, every plane WW II, can hand launch vertically if necessary. The AT6 thinks it is a 3D at about 75% oversized engine.