I never had a foam Bipe myself but when I went through my bipe period most of what I built was WWI stuff. The Fokker D-VII was my first. It isn't real short coupled but it took a while to get used to the ground handling. Once figured out it ws just another plane. I found the Smith Mini plane a real thrill on the ground. Once in the air it was just another plane. The Tiger Moth has a very long fuse and it was more like a trainer in all respects. On take off it would come up on step and if elevator wasn't used you could start hitting the prop on the ground.
I saw the stall speed mentioned by jet. Again, 100% correct. Some of them can be bad and some don't have any problem. I lost my Krier Kraft in a stall while I was showing off. Too slow with a steep bank. Once they go into the snapping stall spin your out of luck. I learned that the hard way.
When building or setting up if the full scale plane had a rotary engine you know from the get go your model will be tail heavy. That applies to any plane that used a round motor though. Just build accordingly and if it's an ARF then use a heavy engine and install your gear forward.
I removed the wires off my Moth and Boeing. Top mentioned Drag, again, another 100% correct statement. When in static display I had the wires all on, when flying I removed them.
If you want to see and feel drag take some wire or string and pull it through some water. Now you have a better understanding of drag.
Planes like the Ultimate are built very clean with as little drag as they can make them.
I haven't been there or posted any photos in a while but I'm sure I have some photos in my file of some of my Bipes is anyone wants to look. I still have the plans to several of them. The Krier was a great build!! I would build another Moth if I found a good kit.
I really did like that Moth!!!