Dom,

I decided to use 4 servos.

In Ken Bryant's build thread, Silversurfer has a fairly detailed discussion about slave struts and his approach to making sure that the geometries were kept even between the two sets of ailerons [ http://www.rcuniverse.com/forum/m_29..._9/key_/tm.htm Post #: 212 ] that you may wish to review....fairly comprehensive discussion that you may find helpful.

v/r

tom