Editing PT boat (section)

=====Second open-ocean trial=====
Because of the problem with ingot loading, a {{convert|185|nmi|km smi|abbr=on}} trial with the PTs fully fitted out was conducted on 12 August 1941. Four boats—''PT-8'', ''PT-69'', ''PT-70'', and MRB—returned and Elco sent two new boats, ''PT-21'' and ''PT-29''. During this trial, boats faced heavier seas, as high as {{convert|16|ft|abbr=on}}. All except the Huckins (''PT-69'') completed the run. The Huckins withdrew because of a bilge stringer failure. The Higgins 76-footer (''PT-70'') completed the entire run but also suffered structural failures: attachments between planking and web frames pulled loose and deck fastenings near engine hatches showed extensive failures. ''PT-21'' suffered minor cracks in the deck in the same location, but not to the same extent, as previously observed in ''PT-26'', ''PT-30'', and ''PT-33''. ''PT-29'' was assigned as a pace boat with ''PT-8'' in order to generate a pounding comparison.<ref name=board />

The average speed results from the {{convert|185|nmi|km smi|abbr=on}} course were: Elco 77-footer (''PT-21''), {{convert|27.5|kn|km/h mph|abbr=on}}; Higgins 76-footer (''PT-70''), {{convert|27.2|kn|km/h mph|abbr=on}}; Higgins MRB and Philadelphia Navy Yard boat (''PT-8''), {{convert|24.8|kn|km/h mph|abbr=on}}. Accelerometers were again installed in the pilot house of each boat, but the readings were incomplete because the violent motion of the boats made observations difficult and in some cases necessitated abandonment of the observing stations. Further, many of those taken were beyond the normal range of the instruments and were considered inaccurate. Elco boats were found to pound heavily and confirmed previous reports of crew discomfort.<ref name=board />