BE36 pilot reported a partial power loss after takeoff that resulted in diversion and an uneventful ...

Attributes
ACN	1717948
Time
Date	202001
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	None
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 45 Flight Crew Total 7200 Flight Crew Type 1000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Taxied the aircraft from the FBO to runway xxl; run-up was fine; magneto checks were fine; takeoff roll was fine. Upon rotation although engine indicating proper takeoff manifold pressure; it was barely producing power and the aircraft was barely climbing. Engine began to sputter. ZZZ tower noticed we were not climbing; and I advised them of engine issue. Tower asked to take a heading of 060 to make a downwind back to the runway. We were very low; very slow and the stall warning was sounding. The engine was running but barely producing power. We managed to climb to approximately 350 feet; maintained a southeast heading. GPS showed ZZZ1 was ahead; I advised ZZZ we were headed there. Water on the way seemed a lot softer than the crowded city. Once runway X at ZZZ1 was assured; I selected gear down; full flaps and landed without incident.

Original NASA ASRS Text

Title: BE36 pilot reported a partial power loss after takeoff that resulted in diversion and an uneventful landing.

Narrative: Taxied the aircraft from the FBO to Runway XXL; run-up was fine; magneto checks were fine; takeoff roll was fine. Upon rotation although engine indicating proper takeoff manifold pressure; it was barely producing power and the aircraft was barely climbing. Engine began to sputter. ZZZ Tower noticed we were not climbing; and I advised them of engine issue. Tower asked to take a heading of 060 to make a downwind back to the runway. We were very low; very slow and the stall warning was sounding. The engine was running but barely producing power. We managed to climb to approximately 350 feet; maintained a southeast heading. GPS showed ZZZ1 was ahead; I advised ZZZ we were headed there. Water on the way seemed a lot softer than the crowded city. Once Runway X at ZZZ1 was assured; I selected gear down; full flaps and landed without incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.