Takeoff Incident
During a cross-country flight, the aircraft became airborne after takeoff but was unable to climb or accelerate. The aircraft's weight was 3,670 pounds, approximately 100 pounds below the maximum allowable takeoff weight. The density altitude at the time was 6,000 feet msl.
Turbocharger Configuration
The aircraft was equipped with manual turbochargers, which were not used during the takeoff. According to the aircraft's operating instructions, the turbochargers should be utilized for high-altitude takeoffs to achieve the desired manifold pressure of 29.5 inches of mercury at 2,700 rpm.
Power Output
Without the turbochargers engaged, the engines produced only 23.5 inches of manifold pressure. This power level was insufficient for a climb at the prevailing aircraft weight and speed. The required manifold pressure for the takeoff conditions was 29.5 inches, which could only be achieved by engaging the turbochargers.
Summary
The aircraft's inability to climb and accelerate was directly related to the lack of turbocharger use during takeoff in high-density-altitude conditions, resulting in inadequate engine power.