› Pre-2022 Etchells Class Rules › F.4.1 (Boom extrusion) Materials › Reply To: F.4.1 (Boom extrusion) Materials
Just to add more information in case it comes up… We may not need to go to this level of detail, but maybe someone in the ODTC should know which spec(s) the spar extrusions comply with. Following is the list of Aerospace Material Specifications (AMS) for AA6061 (taken from U.S. DoD MIL-HDBK-5J) and the structural shape(s) to which each spec applies.
AMS 4025 – Sheet and plate
AMS 4026 – Sheet and plate
AMS 4027 – Sheet and plate
AMS-QQ-A-250/11 – Sheet and plate
AMS 4115 – Bar and rod, rolled or cold-finished
AMS 4116 – Bar and rod, cold-finished
AMS 4117 – Bar and rod, rolled or cold-finished
AMS-QQ-A-225/8 – Rolled bar, rod, and shapes
AMS 4150 – Extruded rod, bar, and shapes
AMS 4160 – Extrusion
AMS 4161 – Extrusion
AMS 4172 – Extrusion
AMS 4173 – Extruded rod, bar, and shapes
AMS-QQ-A-200/8 – Extruded rod, bar, shapes, and tubing
AMS-A-22771 – Forging
AMS 4080 – Tubing, seamless, drawn
AMS 4082 – Tubing, seamless, drawn
AMS-WW-T-700/6 – Seamless drawn tubing
AMS 4127 – Forging
AMS 4248 – Hand forging
AMS-QQ-A-367 – Forging