Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 11.3; Flight Crew Total 1.9; Flight Crew Type 107
Distraction; Situational Awareness
Airspace Violation All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Unauthorized Flight Operations (UAS); Deviation / Discrepancy - Procedural FAR
General None Reported / Taken
Human Factors
Flying VFR on a cross country from LEE to TPF. I was approaching TPF from the east and aware of the Tampa bravo shelf at 3;000 feet. My altitude underneath the shelf was 1;900 feet and I continued westbound towards the field. The shelf lowers to 1;200 feet approximately 6 miles from the airport; which I was aware of and planning a descent.At 3 miles from the airport I believed myself to be at traffic pattern altitude of 900 feet but realized I forgot to continue my descent and had incorrectly read my altimeter to be at 900 feet when I was actually at 1;900 feet. I quickly descended to 900 feet. Upon reviewing my track log I realized I had flown at 1;900 feet in the Tampa Bravo above the 1;200 feet floor for approximately 3 miles and 1 minute.Prior to conducting my planned descent; I was approximately 5 miles south/southeast of VDF when I observed traffic flying ahead of me; crossing from my right to left. The traffic was slightly above my altitude but presented no collision factor. Simultaneously; I looked off my right wing and observed a small red objecting approximately 300 feet off my right wing.I scanned and observed the object for approximately 10 seconds and observed what appeared to be either a drone or an RC helicopter; which I thought to be impractical due to my altitude. It was spinning rapidly in circles and stayed in the same spot and altitude; until I passed it out of view.This occurred before my planned descent and may have contributed as a distraction which led me to forget my descent and incorrectly read my altimeter.
GA pilot reported observing a UAS pass by their aircraft.  After this distraction they forgot to descend as planned and entered controlled airspace.