Trying to stiffen a PBF.
Dale,
You put one in back? Good idea! Did you put it in front of the elevons?
BTW, I know Things with Wings have them I help Jim out all the time. I'll bet I've seen you there.
They are a kick to fly, I had my first one last Winter! When I first brought it out to the field, people did more laughing at it, than when it flew!