I also cannot warp with a ship that easily fits through the warpgate, is it based on volume instead the physical shape of the ship? Can warp with drone. I upgraded to 10 slots then couldn't warp, so I dropped it back to my previous version that could warp(previously) but still can not use the warpgates. EDIT: Figured it out, still had a couple armor pieces on the back that made my length too much. It seems that at a certain length a ship no longer is warpable, even if other dimensions fit well.