DEN84LA185

Before starting the flt, the acft was loaded with full fuel, 5 adult passengers & aprx 45 lbs of baggage. The elevation & temp at the arpt were 3606 ft & 93 deg. The plt said he did not calculate the weight & balance or density altitude limits for this flt because he had previously flown this acft under similar conditions & had not encountered any problems. The plt initiated a no flap takeoff, as was required. He reported that the acft was slow to accelerate during the takeoff roll. After lift-off, he retracted the landing gear, but the acft would not climb & began to decelerate. To the plt, there appeared to be insufficient rwy remaining for a wheel landing, so he elected to land with the gear up. An investigation revealed the acft was about 400 lbs over its certificated max gross weight limit & the density alt was 6528 ft. also, the plt stated that the engs & all systems appeared to be working well. The wind was variable & gusting from calm to 5 KTS. Just before starting takeoff, the wind was reported from 070 deg at 5 KTS.