A DEHAVILLAND -8-100 IN CRUISE AT 4000 FT DECLARED AN EMER AND DIVERTED DUE TO DAMAGE INCURRED WHEN THE R MAIN GEAR OUTBOARD TIRE EXPLODED.

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OUTBOARD #2 SIDE MAIN LNDG EXPLODED IN WHEEL WELL ENRTE TO SWF. TIRE CAUSED TOP BACK SIDE OF ENG NACELLE AND EXHAUST PIPE TO BE BLOWN OFF ACFT. ENRTE ZZZ TO ZZZ1 AT 4000 FT; APPROX 35 MI WSW OF SWF; A LOUD BANG OCCURRED AND ACFT SHUDDERED A BIT. AFTER THAT; WE RECEIVED A R GEAR DOOR LIGHT. WE THEN ALSO NOTICED A LOSS OF ALL HYD FLUID ON THE #2 SIDE. I DISENGAGED THE AUTOPLT AND FOUND NO UNUSUAL HANDLING CHARACTERISTICS OF THE ACFT. APPROPRIATE CHKLISTS WERE RUN. FLT ATTENDANT NOTIFIED US THAT SOME PIECES WERE MISSING ON THE #2 ENG NACELLE. AN EMER WAS DECLARED WITH EQUIP STANDING BY. PAX WERE BRACED AND LNDG WAS UNEVENTFUL. UPON CLRING RWY; ACFT WAS STOPPED ON TXWY AND ENGS SHUT DOWN. WE EVACED PAX OUT OF MAIN CABIN DOOR AS A SAFETY PRECAUTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE OUTBOARD TIRE ON THE R MAIN GEAR EXPLODED IN THE NACELLE CAUSING EXTENSIVE DAMAGE TO THE HYD LINES; TOP AND R SIDE OF NACELLE; EXHAUST STACK AND TRAILING EDGE FLAP FROM THE FUSELAGE TO THE NACELLE. THE RPTR SAID THE R HYD SYS PRESSURE AND QUANTITY WAS LOST. THE RPTR STATED THE INCIDENT IS STILL UNDER INVESTIGATION AND NO PRELIMINARY FINDINGS HAVE BEEN RELEASED. THE RPTR SAID THE TIRES HAD BEEN SVCED PER THE MAINT MANUAL USING DRY NITROGEN.