AN RV8 PLT HAS TO EXECUTE A GAR TO AVOID AN ULTRALIGHT ACFT THAT ENTERED A NON STANDARD PATTERN AND NO USE OF A RADIO.

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BTWN APPROX XA30 AND XB30 LCL TIME ON THE DATE INDICATED I WAS CONDUCTING TKOFS AND LNDGS ON RWY 7 AT N40 AS WELL AS LCL AIRWORK CONSISTING OF COMMERCIAL PLT MANEUVERS (STALLS; STEEP TURNS; CHANDELLS; ETC). ON 2 OCCASIONS DURING THE FINAL APCH PHASE OF THE FLT; I EXECUTED LOW-ALT GARS DUE TO GND AND AIRBORNE CONFLICTS. THE FIRST GAR WAS EXECUTED DUE TO A NUMBER OF DEER THAT ENCROACHED UPON THE RWY. THE SECOND INVOLVED A NEAR MISS WITH AN ULTRALIGHT ACFT. FOLLOWING THE ROUNDOUT TO LNDG AND JUST PRIOR TO TOUCHDOWN; AN ULTRALIGHT ACFT APPEARED TURNING FINAL FROM A R-HAND TFC PATTERN FROM AN EXTREMELY LOW ALT (APPROX 200 FT AGL) ON THE OPPOSING RWY (RWY 25). I EXECUTED THE GAR SUCCESSFULLY; SIDESTEPPING THE RWY TO THE N; AVOIDING THE ULTRALIGHT TFC AND OVERFLYING A NEIGHBORING HOUSING DEVELOPMENT AT A LOWER THAN NORMAL ALT; WHILE CLBING SAFELY TO PATTERN ALT. IN EXECUTING THE EVASIVE ACTION I HAD TO BANK SHARPLY L AND FLY A GND TRACK AND AN ALT THAT DEVIATED FROM NORMAL OPERATING PRACTICE AT N40; BRINGING POTENTIAL CONCERN BY THE RESIDENTS DUE TO THE LOUDER THAN NORMAL ACFT NOISE; AND SEEMINGLY ABNORMAL FLT ATTITUDE. NORMALLY I WOULD NOT DO THIS; BUT THE CIRCUMSTANCES NECESSITATED DOING SO. THE ULTRALIGHT WAS NOT USING A RADIO AND WAS NOT FLYING THE STANDARD L-HAND PATTERN THAT IS USED AT N40. A CONTRIBUTING FACTOR IN ME NOT SEEING THE ULTRALIGHT SOONER; WAS LIKELY DUE TO MY ATTN BEING PARTIALLY FOCUSED ON ANOTHER POTENTIAL INCURSION BY ANIMALS ON THE RWY.