About 10lbs, mvvs 91 is a good engine, but wasnt enough. Go 120 size, saito 120 is light, moki 135 is based on 120 size crank. Both of these would be good.
I lost my plane because I didn't have enought power to get me out of trouble, suppose I shouldnt get myself into trouble in the first place but hey it's all good fun huh??!!
Here is link to the giles I had, I know someone who flew it with an OS160FX, never saw it fly myself but he said he loved it.
http://www.ss16.dial.pipex.com/Furth...rames_page.htm