Took a while to get back to this subject, was away on a long business trip. While I was gone I solved my engine dilema. I picked up a Thunder Tiger Pro-36. Also solved the retract urge. I bought a few other kits, actually 7, including a Marutaka P51. I did find time for 2 flights on the Extra 300 before I left, the OS works great. Now I have to make time to build...