OFF ARPT LNDG BECAUSE OF CARB ICING.

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BRIEFLY; I EXPERIENCED CARB ICING AND SUCCESSFULLY LANDED OFF ARPT WITH NO DAMAGE TO ACFT; PROPERTY; OR PERSONS. PWR LOSS WAS PARTIAL BUT I COULDN'T MAKE IT TO THE RWY. I SIMPLY FAILED TO RECOGNIZE THE CARB ICE AND APPLY CARB HEAT. SUBTLE ENG CHANGES ARE HARD TO REALIZE IN THE LOUD; ROUGH CABIN OF THE SUPER CUB. AT DUSK ON MAR/XX/95; WHILE APCHING TO LAND AT MCK; NE; I EXPERIENCED CARB ICE RESULTING IN AN OFF ARPT LNDG. THE EVENT OCCURRED AT THE END OF A LONG EBOUND FLT; APCHING DARKNESS; GREATER THAN FORECAST HEADWINDS WHICH WERE UNCUSTOMARILY OUT OF THE E RATHER THAN THE W; AND A LONG DSCNT (5500 FT DOWN TO TFC PATTERN ALT). BECAUSE OF THESE STRESS FACTORS; I FAILED TO APPLY CARB HEAT. THERE WAS NO TIME TO CONSULT A CHKLIST. MAINTAINING CTL AND FINDING A SUITABLE LNDG SITE WERE MY PRIMARY FOCUS. AFTER 750 HRS IN A PA18-150 AND MANY INSTANCES OF CARB ICING AT ALL RPM'S AND FLT SITS; I STILL HAVE TROUBLE RECOGNIZING CARB ICING AND BELIEVE IT'S DUE TO THE HIGH NOISE ENVIRONMENT AND VIBRATIONS OF THE PA18-150. IN THE PA18-150 SUPER CUB; ONE DOES NOT HEAR THE RPM DROP OR FEEL THE ROUGHNESS OF THE ENG USUALLY ASSOCIATED WITH CARB ICING AS IN OTHER ACFT. TO PREVENT A RECURRENCE; PLTS OF PA18-150'S NEED TO PAY SPECIAL ATTN TO CARB ICING IN ANY FLT CONFIGN. PERHAPS A PLACARD WARNING OF THIS SPECIAL PROB OF PA18-150'S IS WARRANTED.