The Wayfarer is a very nice aircraft. A modern .40 - .46 two stroke should provide plenty of power as would a four-stroke engine. An OS 52 or Saito 56 comes to mind. Previously it was kitted by the European company Svenson and it may be that it is still kitted in Spain. I found a Spanish web shop that advertises the Wayfarer, [link=http://www.aeromodelismoserpa.com/product_info.php?products_id=1840]here[/link].

/Red B.