Letter to the FAA office of legal counsel regarding the interpretation of the use of batteries in part 103 aircraft.
Preamble. In order to give you some idea of what transpired prior to the writing of this letter I will bring you back to the year 2011. During this time frame the interest in electric aircraft was quite robust in ultralight arena. Our analysis like many others had shown that the electric power plant and battery systems would most likely play out in the smallest of aircraft 1st before moving their way up to the larger aircraft. We were fairly far into the design and development of the EMG-5 aircraft when we were approached at several air shows suggesting that our interpretation of the regulations may in fact be in error.