Have you had many Classic Pattern designs that wanted to snap or stall at proper approach speed in the past? I have 9 pound Tiporare that flies slower than many Warbirds at my field, straight as an arrow. I'm sure if I slowed it down too much it would stall, or drop a wing even, snap? I see people do that with ARF Warbirds but have never seen any ARF Classics doing anything near it. I've only seen one Dirty Birdy ARF, but dozens of Phoenix 7 ARF's and they all flew very well.