Thank for your quick responses!

darock

Yes, I agree with you in that with modern RC gear it is unnecessary to enlarge the tail "volume". So, why has been established almost as a rule to increase the real size (scaled down) of almost all scale model airplanes?. In fact my scratchbuilt Tempest Mk VI (electric, Mega 16/20/4 geared 3.2:1, LiPo 3s3p, balsa/solartex fuselage, extruded polystirene core/balsa wings 125 cm.(50")WS) has a stab exact to the original with a NACA 0010 airfoil and behaves quite correctly, never a problem and quite mild in basic acrobatics (aerobatics?).

mesae

That's an old "aeromodeller legend". My earlier (still flying!) 109E, all balsa, "cheated" washout in wings, is easy to fly and land, only troubles arise in taking-off from irregular fields mainly because of the narrow landing gear, maybe G model with its rounded wingtips, no washout, was more prone to abrupt stalls?

Radios don't have interferences, pilot's fingers do have!