I am looking at getting an RCV60-SP to have something a little different.

Would this engine be enough for a 8lb trainer? I would be looking for super slow lazy flying, nothing fancy. The plane currently has a magnum 90 4 stroke and it flies easily at about 20% throttle.

Also, why does the castor oil content have to be so low? The fuel in Argentina where I live has a higher percent of castor than that. Will that be a problem?