The aircraft barely climbed after lifting off from runway 29 and was seen to pass at 30-40 feet above tree tops before it crashed in a logged area 2,55 miles from the runway end. The aircraft was 1745lb overweight and had lost power on one engine. Because the autofeather system was not connected, the prop did not feather. PROBABLE CAUSE: pilot in command – attempted operation w/known deficiencies in equipment personnel – maintenance,servicing,inspection: inadequate maintenance and inspection powerplant – exhaust system: stacks powerplant – engine structure: valve assemblies miscellaneous acts,conditions – fire in engine FACTORS: miscellaneous acts,conditions – improperly loaded aircraft-weight-and/or c.g. miscellaneous acts,conditions – improper emergency procedures miscellaneous acts,conditions – pilot fatigue partial power loss – partial loss of power – 1 engine