A PORPOISING TRICYCLE GA ACFT COLLAPSES ITS NOSE GEAR DURING A STALL AFTER A SERIES OF HIGH BOUNCES ON THE RWY AT 6S5; MT.

Narrative

I WAS PRACTICING SHORT-FIELD TKOF AND LNDGS AT HAMILTON FIELD; WHERE I'VE TRAINED FOR THE LAST SEVERAL WKS ON A CALM; CLR DAY. I APCHED RWY 16 WITH 30 DEG FLAPS AND TOUCHED DOWN AT ABOUT 65 KTS; FASTER THAN THE 55 KTS I WAS HOPING TO TOUCH DOWN AT. MY 2 REAR WHEELS TOUCHED DOWN (FAIRLY HARD; BUT NOT EXTREMELY HARD); AND BECAUSE OF MY AIRSPD AND FULL FLAPS; THE ACFT ROSE A FEW FT ABOVE THE RWY. WITH HINDSIGHT; I REALIZE THAT I SHOULD HAVE ADDED PWR. AT THIS POINT; I DID NOT ADD PWR. THE ACFT SETTLED; AGAIN ON THE 2 REAR WHEELS (AS I APPLIED MODERATE BACK-PRESSURE TO THE YOKE); AND THIS TIME; IT BOUNCED HIGH -- I'D GUESS 10 FT; IT SETTLED AGAIN ON ITS REAR WHEELS AND STALLED. IT THEN BOUNCED VERY HIGH -- PERHAPS 15 FT -- I CAN'T BE SURE. THIS (LAST) TIME; IT CAME DOWN EITHER ON ALL 3 WHEELS SIMULTANEOUSLY; OR NOSE GEAR FIRST. THE FRONT GEAR FOLDED UNDER. THE AIRPLANE NOSED OVER; STRIKING THE PROP AND L WINGTIP. I SKIDDED TO A STOP; WITH TAIL HELD HIGH AT ABOUT 45 DEG ATTITUDE. I REMOVED THE KEY; TURNED OFF THE MASTER; AND DEPARTED THE AIRPLANE QUICKLY. I WAS UNHURT. I LIFTED THE NOSE AND RIGHTED THE AIRPLANE; AND WALKED TOWARD THE OFFICE.