Maistaucher
Vereinsmitglied, Offizieller 1. Avatarbeauftragter
Oh, this discussion has been the trigger for several wars already...
As a first entrance maybe you can have a look to threads which already talked about Butterfly, like e.g.:
http://www.rc-network.de/forum/showthread.php/36563-Butterflystellung-Querruder-wie-weit-nach-oben
http://www.rc-network.de/forum/showthread.php/236149-W%C3%B6lbklappe-und-St%C3%B6rklappe-bei-Gro%C3%9Fsegler
But there are many more.
As a first entrance maybe you can have a look to threads which already talked about Butterfly, like e.g.:
http://www.rc-network.de/forum/showthread.php/36563-Butterflystellung-Querruder-wie-weit-nach-oben
http://www.rc-network.de/forum/showthread.php/236149-W%C3%B6lbklappe-und-St%C3%B6rklappe-bei-Gro%C3%9Fsegler
But there are many more.