World Models Extra 30 Sport. Which engine?
If I was you, I would put the O.S. 46FX on it. It weighs less and has more power. Although, it does cost about $30 more.If you go to towerhobbies.com, you can see the spes there. It produces 1.62HP @ 16,000RPM and only weighs 16.45oz with the muffler!
It should be plenty of motor for the Extra 30.