Brian, I used to honeycomb my cores but went away from it a few years ago. You've got me thinking about going back to honeycombing on the other surfaces besides the rudder. The weight savings is there making it worthwhile.

Since I prefer finishing the balsa in esaki tissue or silkspan and dope, strength is a non-issue. The only thing I didn't care for was the dimples which are visible after the finish is applied...... but functionally, its a non-issue. Maybe smaller openings might help the dimple appearance; just thinking out loud.