I had an ARF Fokker D.VII with a TT GP 40 in it, it was under powered. it would only loop if I flew it up real high and come straight down to gain speed LOL. boy was that plane fun. I loved it. slow, waist high fly bys. but I'll tell you, even tho it was under powered it would fly really high. I bought it for $50 with a cheap TX/RX in it, I flew it for 2 years. it crashed and smashed.
sold it for $4 less engine, the guy that bought it fix it up and put an OS52 4popper in it, it was way overpowered. LOL he crashed it, like on his 3rd flight with it LOL
.LOL Fun fun fun LOL
BTW, the guy that bought it from me was a P-47 Grew Chief in WW11. "Hank" I loved that guy