Bart the size of the updated stab is 5 3/4" by 24". This plane is a fast flying ship. Also Hi said if it turns tighter inside loops add down thrust, if outside tighter add up thrust. Let me know if you have any other question. You need to keep this ship light, especially the tail. Mine required some nose weight. Hi also had a note on the early 35s about crank bearing clearance being to tight to use some lapping compound. I wish I new how to copy & send it to the forum, sorry Im computer challenged.