The S-5 was tested in a series of 20 to 30-second straight-line flights, over a period of three weeks, before the designer was able to make what he called his first real flight of four minutes, in a circuit of the field, on 17 May 1911.
S-5 diuji dalam serangkaian penerbangan garis lurus dalam 20 sampai 30 detik selama tiga minggu, sebelum desainer mampu melakukan tes penerbangan nyata pertama dalam empat menit, di lapangan sirkuit pada tanggal 17 Mei 1911.