I really have to ask this "stupid" question.... and it´s a bit offtopic
I found this Grims talk from Super Tune Your Super Vee 27 topic what needs to be done to stock sv27:

Rudder blade tucked full under (stock shear bolt)
http://www.rcuniverse.com/forum/m_47...tm.htm#4752309

I don´t understand what is stock shear bolt do i need to change my svees rudder position(stock position is about 90 dec) to smaller angle(tucked full down)? What do i get to make this operation??stability in turns or what???