http://www.valak.net The link to the video is on the page. Note my friend's reaction

Anyways, 5th or 6th flight of the day, plane flying smoothly and engine running well. After take off, I take the plane vertical and start a right aileron roll. Just after I start, there is a loud "pop" and the engine dies. The landing was quite scary but was uneventful. I brought the plane back to the pits to see what happened.

Turning the propeller like you would to prime the engine, there is a constant friction. The engine still has good compression. A friend said that a bearing might have seized up or something like that. Everything seems normal except for the friction.

The engine is a Saito FA-100 turning an APC 15x6 prop like I've always used. Nothing bad has happened to this engine until now. I turned the needle valve to get max RPM until it started to fall off, then turned it back maybe a half a turn to 3/4 turn. Its been in this position since I completed the break-in process.

Any help would be appreciated.