Well I have moved on to 33% and 35% and I'm useing mostly ZDZ 80 RV in my 33% extra. I have a ZDZ 85/B2 in My Sukhoi. Both are fine engines. I'm glad that you had good luck with your DA 50. Myself I won't take a chance on DA again, after loseing two crank shafts and Piston rods. I'm picking up a new TS69, and another 3.2. Bill swears that there is a great deal of defference between this new model, and the older version. More power, and it only weighs 3.3 lbs.