Hummmm.... I've been thinking. I've had an 8611, running 6V, on my Patty and I thought it was awfully weak. Knife Edge loops lost surface control. Point rolls wouldn't hold either with that cheap 8611 servo. I think you aught to buy 3 of them and gang them together to get the maxium torque needed for these kind of maneuvers. Then, after you've found out that three of them is way overkill, you can sell two of them to me, cheap.

Just kidding. The 8611 would be an excellent choice for the pull-pull rudder on a Patty.