GA SMA ON MAINTENANCE TEST HOP LANDED GEAR UP.

Narrative

AFTER LEAVING FBO I TAXIED TO THE WASH RACK. ENRTE I NOTED A LARGE DISCREPANCY ON THE FUEL FLOW GAUGES; BTWN LEFT AND RIGHT ENG; SO I RETURNED TO FBO AND WAS TOLD THAT THE PROB HAD TO BE OTHER THAN THE INSTRUMENT. I TAXIED BACK TO THE WASH RACK AND THEN WALKED TO FBO. THE MECH SAID THEY WERE UNABLE TO CHK IT OUT BUT AS A FAVOR HE WOULD TAKE A LOOK AT IT AFTER CLOSING TIME AT THE WASH RACK. HE DID SO AND AFTER ADJUSTMENTS TO THE ENG WHICH APPEARED TO BE FAVORABLE; WE TAXIED TO THE RUN UP AREA AND DID SO. ON RUN UP THE PROB SEEMED TO BE BETTER. I TOOK OFF AND BEGAN TO CLB TO PATTERN ALT. THE PROB SEEMED TO WORSEN SO I STAYED IN THE PATTERN. I HELD BLUE LINE (NO FLAPS) ALL THROUGH THE PATTERN AND APCH. SOMEHOW I GUESS I BECAME PREOCCUPIED WITH THE PROB AND MISSED PUTTING MY GEAR DOWN. WHEN ON FINAL AND NEAR TO THE GND I BEGAN TO FLARE AND REDUCED PWR. AT THAT TIME I HEARD THE GEAR WARNING BUT MISTOOK IT FOR A STALL WARNING. I INCREASED PWR AND LOWERED THE NOSE A BIT. THE WARNING STOPPED. I THOUGHT I HAD SOLVED THE PROB AND COMMENCED TO LAND. BY THE TIME THE ACTUAL OCCURRED TO ME IT WAS TOO LATE TO TRY A GO AROUND OR TO PUT DOWN THE GEAR. I CTLED THE ACFT AS BEST I COULD WITH RUDDER. IT SLID TO A STOP CENTERLINE OF RWY.