HI,
Just Flew my dr1 last week.I have an os 91 surpass in it. it balanced Perfectly.This plane flys great!!!.Its now my favorite.I dont know if you have read any of the other threads but they made me nervouse about the first flight.I worried for nothing.I didnt have any problem with groung looping.It's quite easy to land.I had the unfortunate pleasure of two dead stick landings.One was a good way away from the strip and the other was inverted over the strip.I managed two bring her back both times.Its not a glider but wont fall out of the sky either.The landing gear is a bit narrow,so it requires a little more attention.Hope you have a great time with yours.