"Not really. Such small engines can be bought cheaply, and a weight is not a problem either. The outer shell may be problematic.”
"Really? Why is that problematic?"
“Well, first of all is the shape of it. It can’t be too big or too thick… Unless someone wants just that. Second, it must be waterproof, otherwise the motor will malfunction quickly. It also needs to be durable, to not get crushed by contractions.”