Whats wrong with my rocket velocity?

Im making a rocket launcher in roblox and the velocity is not working. I have compared the script with my other gun and it's still not working! Please help. Script:

    v = Instance.new("BodyVelocity",r)
    v.velocity = r.CFrame.lookVector*100
    v.maxForce = Vector3.new(math.huge,math.huge,math.huge)