I'm not the best when it comes to physics but i really don't think that the stabilizing fins are going to do the job. To my way of thinking the rotation of the chain and the unbalanced weight of the motor would cause the rocketchainsaw to spiral out of control, this is great if you want to deal damage to a large group of people is a packed environment but if you had a shingler target in mind i would stick to the potato gun.
Can you say Crowed control