THE PLTS OF A BOEING A75, N55070, & A VULTEE BT-13, N176VR, WHERE IN FORMATION AS THEY APCHD THEIR DESTINATION. WHEN THE SAW THE ARPT, THEY SEPARATED FOR SEPARATE LANDINGS & LOST SIGHT OF EACH OTHER. BEFORE LANDING, BOTH PLTS FLEW OVER THE ARPT & NOTED THE WIND WAS NEARLY A 90 DEG X-WIND. THERE WAS NO UNICOM AT THE PVT STRIP. THE BT-13 PLT MADE RADIO CALLS IN THE PATTERN ON 122.9, BUT THE RADIO IN THE A75 WAS INOP. SUBSEQUENTLY, THE PLTS LANDED IN OPPOSITE DIRECTIONS. THE BT-13 PLT LANDED ON RWY 13. HE SAW THE A75 IN A LEFT PATTERN FOR RWY 31, BUT AT 1ST, HE THOUGHT THE A75 PLT WAS GOING TO MAKE A LOW PASS. WHEN THE A75 CONTINUED & DROPPED BELOW HIS LINE OF VISION, HE REALIZED IT WAS GOING TO LAND. HE TURNED RIGHT TO DEPART THE RWY, BUT THE LEFT WING OF EACH ACFT HIT THE OTHER. THE A75 PLT SAID THAT BECAUSE HE WAS LANDING TOWARD THE SUN & WAS LOOKING AT THE WIND SOCK, HE DID NOT SEE THE BT-13 UNTIL APRX 1 SECOND BEFORE THE IMPACT. THE SEGMENTED CIRCLE ON THE ARPT INDICATED THAT A RIGHT PATTERN SHOULD BE USED FOR RWY 31.