Awol 57,
Fair enough, I'll agree that full flap would provide some masking to the rudder - but enough to warrent a policy of not doing sideslips because of this concern alone? I can gaurantee that if you are flying at a normal approach speed there is plenty enough rudder authority there to kick in and hold a good sideslip. If perchance you feel things are getting out of hand all you have to do is neutralise the rudder and hold the wings level and you will be back in balance in a flash as most basic trainers are very positively directionally stable!
Dreamer J - sorry but open your eyes! I think you have a bit of learning to do...