Table:
text: VSS Enterprise
List of test flights
List of test flights
Flight_designation Date_ Duration Pilot_co_pilot Feathered_Fxx
58 / GF07 4 May 2011 11 min, 5 sec Siebold / Nichols F01
57 / GF06 27 April 2011 16 min, 7 sec Stucky / Alsbury None
56 / GF05 22 April 2011 14 min, 31 sec Siebold / Shane None
47 / GF04 13 January 2011 11 min, 34 sec Stucky / Nichols None
45 / GF03 17 November 2010 11 min, 39 sec Siebold / Nichols None
44 / GF02 28 October 2010 10 min, 51 sec Stucky / Alsbury None
41 / GF01 10 October 2010 13 min Siebold / Alsbury None
GFxx=Glide Flight GFxx=Glide Flight GFxx=Glide Flight GFxx=Glide Flight GFxx=Glide Flight

Question: If the duration was 11 minutes, 34 seconds, what was the spring (Fxx) for VSS Enterprise?