Ahoy hoy,
If you click on my brewblog link in my sig below, and find the blog post for my building of my hopinator, which I just call the Alaskan hop gun, (the post you need is Alaskan Hop Gun, Beta 2) Ive got a video on there showing the thing running, and hops a shooting out of the end. I tweaked the design a little and it helped quite a bit, including a second hole on top down by the hop manifold, so you can actually see what is going on. I also used something different for the hop manifold (which is what i call the part with the hole the hops fall out of) and have multiple hole sizes for different rates, as well as different sized pellets. Im drinking a stone ruination clone I brewed using it a couple months ago, and its a fine drink. If anyone needs any fine points explained, PM me and Ill do my best to answer them for you. I am very happy at this point with my hop gun.
I bid you all a great day.