J_R,
Did you see me qualify my reply by stating Composite ARF's AEROBATIC planes???

Since when is a Top Flight Gold Edition P-51 and the other Gold edition warbirds considered to turbine powered???

You said that you didn't know of any planes, excluding turbines, that were engineered as opposed to being designed empirically...I was just letting you know of a few. I know that David applied his engineering skills towards the redesigned TopFlite kits as he and I have discussed this.
I think that the percentage of non-turbines planes that are truly engineered are few indeed as opposed to being designed empirically. I wasn't trying to pick a fight---Just pointing out a few since you knew of none.
Kevin