With all due respects to your reminder to me of the basis of this thread , I started the thread , so I do know the purpose of it. At that time, the Saito FG-20 was just out and I thought it might be capable of powering a smaller pattern - practice ship- just to save a few bucks on fuel. My current recommendation about the Syssa 180 was meant to help along those lines ( economical pattern)for the more popular 2M aircraft.

There are used 2M aircraft on the market and ARCs/ ARFs like the Focus 2 that are economical, viable pattern mounts and the Syssa will power them effortlessly. Read some of the recent posts, if you desire.

Whether its a 90, 120 or 2M aircraft, that's up to you. Smaller size doesn't always equate to less money. It sounds as though you already have the aircraft or one in mind. Power it anyway you like and good luck along the way.