well it may not be as powerful as some 40cc engines, but I have a MVVS 35 with a inverted side muffler in my 15&1/2 pound 82 inch span GeeBee Y and it pulls it very well,,

my MVVS 35 with that inverted side muffler will spin a Zinger 20x8 Pro at 7500 "tuned for flight" and a wood 3W 20x8 at 6800 "tuned for flight",, although I think I need to spin it a bit higher than 6800 so I am going to order a 3W 19x8,,

my engine is 3 summers old now and I have not kept up on the MVVS electronic ignition, but if you get the same ignition I have you will need a 5 cell pack, just not enough spark on a 4 cell to start it well, but you better ask about that before buying, other than that I have had NO problems and I love the motor,, once primed and popped mine will start in 2, 3, or 4 flips..

Jim