What happened
The pilot reported that the Cessna 188B accelerated normally to climb speed during the takeoff roll. However, at approximately 100 feet above ground level (AGL), the pilot observed low manifold pressure. While all other engine readings appeared normal, the engine experienced a rapid loss of power. The pilot attempted an emergency landing in a hay field located adjacent to the airport.
Upon touchdown in the field, the main landing gear dug into wet and soft ground, causing the airplane to nose over. The pilot noted that engine power was at minimal to zero levels during the touchdown. The pilot was not injured.
The investigation
An examination of the aircraft revealed no mechanical anomalies. During the investigation, the pilot stated he could not recall the specific configuration of the switches used for takeoff.
A review of the Cessna 188B Owner's Manual was conducted. The manual contains instructions regarding hot weather engine starts, noting that fuel vapor may require the auxiliary fuel pump to remain in the 'ON' position for over one minute to clear vapor. Additionally, the manual specifies that for 300 horsepower engines, it is important that the auxiliary fuel pump be turned off for takeoff, as leaving it on causes an excessively rich mixture and a serious loss of power.