Small, powerful, inconspicuous separation motor

[SpaceLaunchSystem]

I need a small separation motor for a project I'm working on. It needs to be light, produce little drag, and most of all be INCONSPICUOUS. What I mean by that is the motor needs to be hardly noticeable.

[Boomerang]

Not a motor on it's own, but there are a couple of 1.25m decouplers in this thread with built-in separation motors. Might not be what you need, but if it is, you could make a 2.5m/.625m version easily enough by changing the scale, if needed. More designs are buried in the thread.

http://forum.kerbalspaceprogram.com/threads/79352-The-Open-Part-Mod-Week-5-9-Project-Started

[SpaceLaunchSystem]

That's a cool mod! Not what I was originally thinking about, but cool!