First of all, I suggest you go take a look at the dimensions of a modern, high performance sailplane - this is what you're talking about when you describe an ai

First of all, I suggest you go take a look at the dimensions of a modern, high performance sailplane - this is what you're talking about when you describe an aircraft that's capable of a glide ratio of >50:1. They're not heavy, but they are large, and they are cumbersome. For example, a Jonker JS-1 Revelation is a fairly state-of-the-art design manufactured with high-tech materials (including carbon-fibre and Kevlay). It is over 7 meters long and has an 18 meter wingspan, in order to carry a total payload of ~300 kg, which is roughly about where you start for bombs expected to have serious effects on blue-water combat ships. How exactly are you delivering a swarm of these from 60,000 feet?