The dazzler is more of a sport plane. If you want to over power it the 70 will be perfect and if the cub is a 40 size the 40 will be great for a scale motor . I have a 40 size cub with a saito 30. It is way underpowered for most, but I find it to be scale power. Is the 70 4 stroke and the 40 2 stroke?