Okay I just thought of a new type of design for a hybrid type launcher. I have no idea how well this would work or wouldn't work, so I am here to ask you guys.
The main difference between this and a normal hybrid would be that the gases are accelerated before they are ignited.
This design would consist of one chamber (where the fuel and air are mixed and pressurized) and then another chamber with just air and a spark. The chambers would be separated by a burst disk.
The picture pretty much explains how it works so here you go.
<img src="http://www.spudfiles.com/uploader/uploadFiles/Hybridtypedesign2.JPG">
Sorry if this is going to be some sort of bomb:x. I am not planning on constructing this any time soon. Just throwing the idea out there.
-EDIT-
Diagram updated