YAY im going to my first NAR club launch on saturday, at wich my tlp ALARM will be making it's first appearence (yay). it's called the NOVAAR NAR club ( in case any of you are members there). but i do have one question before i go. the box on my ALARM says it can take an estes D engine(wich fits fine without an adapter) but it wont fit estes E engine (hangs way out the back) so does this mean that aerotech E engines are the same length and diameter as estes D engines or was i supposd to do something diffrent to make it able to fit aerotech E engines.