Hey Engindesigner,
Built an XL last year. Lots of posts on this ship. Just put Patriot XL in the search engine and you will find lots of info.
http://www.jettengineering.com/hall/fb-patxl-90L.html
Engine: Jett 90L (of course!), Robart Retracts, Futaba S3151 servos.
kamakazie frank