There are a couple of threads about this kind of OEM aileron rigging. The Skybolt and 40size Ultimate both have the OEM rigging. That rigging basically violates one of R/C's most respected rules for rigging. You want the pushrod to make a right angle at the servo and at the horn. Here's what that OEM setup gives you. The attached shows a setup I made using measurements from my ARF. The setup works exactly like the model, only it's easier to measure accurately.

On that airplane, when the TX stick is moved to get 20degrees aileron deflection...... both bottom ailerons give you 20degrees. They're both driven directly from the RX after all. But the upper aileron on the side with the up-going aileron winds up being pushed 23 degrees by the lower aileron (which is going 20 degrees). At the same time, on the other side of the wing, the upper aileron on the down-going aileron winds up being pulled down 26 degrees by the lower aileron (that is going 20 degrees).