I got this on eBay 2 years ago, I bought one with a round glass fuse, this came. I finally put it together, it calls for a 40~46, so a OS 60 sounded good to me![:-] I have a Futaba PCM 5 channel in it, it called for aileron servos out in the wing and a central flap servo. I thought the flaps was a waste of time so I joined the flaps to the ailerons, and use one central servo to drive both ailerons.