we will certainly look forward to seeing how these new engines perform - seriously.
The choices are not all that simple tho -
I don't think all of the engine choices were in the same price range -for one .
comparing 100+cc with a 75cc? - hmmm-
Of the choices ASKED about - the 75 --on a good tuned system , would be a lees expensive -andwith some attention to weight - a pretty good choice.
HOWEVER---
ANY engine weighing 4 lbs -in the Sukhoi -- will need ballast up front , unless the servos are all relocated and or/ the belly of the model is lightened .
I have built these -with singles/ twins (DA ) and helped a friend figure how to redohis with a BME twin -to get it to balance -without ballast.
So far the easiest power setup I have seen -on this model - is a 100 cc twin weighing over 5 lbs -simply because of balancerequirements.
note: I did not mention relative power of these or other engines