Okay, as another teaser to tie in with the primary and secondary engines (seen in http://www.renderosity.com/mod/gallery/index.php?image_id=1522614 ), I'm releasing a little sneak peek of the tertiary engines of the vehicle I'm working on - the model has three main engines, two secondary engines, and eight tertiary engines - that's a lot of engines... What you have here, is a portion of the superstructure of the model. The four nozzles of the engine array, complete with four compressed gas bottles, two of which deliver boost fuel into the jet flames (fuel injectors yet to be modelled), the other two pump liquid nitrogen into the pipes you see, connecting the heat sinks surrounding the engine nozzles, in order to cool the engine and the superstructure down! This is the modified version with the heatsinks surrounding the entire nozzle, and being much more extensive around the back of the superstructure. I tried to update the original image, but for some reason, rosity wasn't having any of it... Aaaaanyway, if you can't figure out what it is, great! As I don't want people to guess too early - if you CAN guess what it is, well done, have a beer on me, and please don't tell anyone! :D Hope you like it!