13 engines, electric.
And clearly they have built multiple aircraft (I haven't found N-numbers for all of them yet).
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NN...
And clearly they have built multiple aircraft (I haven't found N-numbers for all of them yet).
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NN...
http://registry.faa.gov/aircraftinquiry/Name_Results.aspx?Na...