At least 100x100. The bigger, the easier it is to add the glow around the ship and then shrink it down to fit the silhouette area.

Ok, I'll leave it at full-size for you then. Here you go:

https://dl.dropboxusercontent.com/u/63126000/Wayfarer%20Silhouette.png

It's got some rough edges, but it should be a decent starting point.

This has been buried in a couple other threads, so thought I'd separate it out and put it into its own thread.

http://www.daemonstorm.com/article/2013/07/09/star-wars-edge-empire-other-sheets

One allows for the changing of the silhouette of the ships shown. It is pretty limited (about 6 ships right now). Enjoy.