RE: 3W vs. DA
I have first hand experience of one DA 50 crankshaft failure, one front bearing failure and numerous failed ingnitions. NO engine is problem free. Unless you have "SEEN" the failures - "I heard about it" simply doesn't cut it.
That said I fly 3W, but the DA-50 is by far the lightest and most power for the money. I just ordered a DA-50 for my new Velox last week.
The only engine I think that will come close to the DA's power and weight is the MVVS 58, but it's too friggin expensive.
For 50cc - DA and 3W are about as good as it gets, DA wins my vote as it is over 1 pound lighter... on a 15 pound plane that is huge!
DP