PLT TRAINEE LANDS INTENTIONALLY IN DIRT OFF RWY THINKING SOMETHING IS WRONG WITH THE ACFT (C152) RUDDER AT DWH.

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WHILE DOING TKOFS AND LNDG PRACTICE ON RWY 17L AT DWH; WINDS 150 DEGS AT 10 KTS. FIRST LNDG WAS OK; SECOND LNDG REQUIRED A GAR. THE AIRPLANE KEPT YAWING TO THE R MAKING THE LNDG UNSAFE. ON TKOF AND BEST RATE OF CLB (67 KTS) THE PLANE MAINTAINED ITS YAW TO THE R EVEN WITH FULL L RUDDER DEFLECTION. IN ORDER TO AVOID STALLING THE PLANE AT LOW ALT BY ATTEMPTING TO MAKE A TURN BACK TO THE ARPT; I DECIDED TO LAND THE PLANE ON A PATTERN DIRT FIELD ON THE SW END OF RWY 17R. I WAS ABLE TO LAND THE PLANE SAFELY WITHOUT INJURY TO MYSELF; DAMAGE TO THE ACFT OR PVT PROPERTY. THE ACFT WAS LATER INSPECTED BY THE SCHOOL'S A&P MECH AND AN FAA INSPECTOR AND NOTHING WAS FOUND WRONG WITH THE RUDDER CTLS. THE ONLY LOGICAL CONCLUSION WOULD BE THAT IT WAS PLT ERROR; BUT TO THE BEST OF MY RECOLLECTION THE ACFT RUDDER CTLS MALFUNCTIONED. WHEN I RESUME MY TRAINING TOWARDS MY PVT PLT CERTIFICATE; I WILL REVIEW TRAINING IN THE AREAS OF XWIND LNDGS AND EFFECTS OF PRIMARY FLT CTLS; AERONAUTICAL DECISION MAKING AND SPATIAL DISORIENTATION.