Searey lsx experimental pilot reported a partial loss of power on takeoff and returned for landing.

Attributes
ACN	1361504
Time
Date	201606
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Seaplane or Amphibian
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	None
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 13500 Flight Crew Type 80
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Takeoff clearance was received for runway 33. Upon reaching approximately 40 feet AGL after takeoff the aircraft experienced a partial loss of power. I began a return to runway 15; however as power began to return I performed a teardrop; short approach; to runway 33 to achieve a better runway landing position.time did not permit [to advise ATC] while airborne. However; I did report that I had a partial power loss; and that I was returning to the field. Some transmissions may have been partially blocked. The tower recognized that I had a time critical situation and assisted by clearing the runway. I performed a landing on runway 33 without further incident. I contacted the tower to [talk about the situation] post facto.

Original NASA ASRS Text

Title: SeaRey LSX Experimental Pilot reported a partial loss of power on takeoff and returned for landing.

Narrative: Takeoff clearance was received for Runway 33. Upon reaching approximately 40 feet AGL after takeoff the aircraft experienced a partial loss of power. I began a return to Runway 15; however as power began to return I performed a teardrop; short approach; to Runway 33 to achieve a better runway landing position.Time did not permit [to advise ATC] while airborne. However; I did report that I had a partial power loss; and that I was returning to the field. Some transmissions may have been partially blocked. The Tower recognized that I had a time critical situation and assisted by clearing the runway. I performed a landing on Runway 33 without further incident. I contacted the Tower to [talk about the situation] post facto.

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.