RE: pull- pull rudder servo placement
Was thinking the same as perre. It could be made to work, but one of the main benifits of using pull-pull on rudder is that the servo can be moved forward. There is really no "flex" in a pull-pull system so the short linkage idea really doesn't apply. If you need to put the rudder servo in the tail so close that a small pushrod would work, might as well use the pushrod... less maintenance and easier to configure.