I have the 120 S in A Boing Bipe, the F4B-2 that was 12 pounds when complete but due to the incorrect CG given on the plans I had to add several pounds to the cowl, it is now 15 pounds and the 120 pulls it around very well as far as scale flying goes. Just give that some thought and you will see the over kill you would have. I used the 110 YS in A 8 pound Krier Kraft and with A 16X6 it was beyond great for vertical but I slowed it down with A 14X10 so it wasn't so fast. The Hogs I have got to fly have all had the OS 91 in them and it is more then enough for such and nice light plane. Still, I just love my YS and plan on building another plane around it.