This rocket is designed for up to a C6-7 engine, but it is sturdy enough to handle Aerotech D reloads. The streamer is nice, since it brings the rocket down quickly enough that it doesn't land too far away, but slowly enough that it comes back intact. We painted the rocket bright orange, to make it easier to find. However, we used Krylon paint, which we would not recommend, because it chips, even though we did multiple coats of primer, then paint, then clear coat. This is a great first, inexpensive rocket. It's also easy to build, and is a great value.