Those two blade is really impressive!! About the extend of the VSBR of my F91(http://www.mocpages.com/moc.php/289737), I won't say it is extend but move forward. The front part and the rear part is connect with 3 dot at close position. When move forward, it only connect with 1 point. Hope you can understand my poor English and get what you need. If not, let me know, I'll take some photo for you.