grampajames,

[link=http://www.scottellingson.com/]Brillelli[/link] engines are the way to go. I have had their 25cc, 26cc, and 40cc. Currently I am flying the GSP Giles 202 140 with the [link=http://www.scottellingson.com/]Brillelli[/link] 26cc swinging an APC 17X6 prop and have the 40cc on the business end of the new QQ Somenzini YAK 54 73". I'm also looking at the 46cc for my next project. These are great and affordable little gassers and the customer service is outstanding. I'm sure there are some better engines out there but look at the price. For a poor boy like me, you can't beat a [link=http://www.scottellingson.com/]Brillelli[/link] engine.