RE: ZDZ 40 compared to a DA 50??
I can give a quick comparasion between a ZDZ 40 and the ZDZ 50 NG since I have both. the 40 will turn a menz 22-8 6300 rpm static, the 50 turns the same prop 7200 static, both engines have pitts style mufflers and were run on the same fuel mix. You should see at least the same difference with the DA.
zonk