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41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar).
Download as PDF; Printable version; ... Steel grades to classify various steels by their composition and physical properties have been ... 4130: 25CrMo4 GS-25CrMo4 ...
It was built using a modified carbon fiber AR-15 lower receiver coupled with a modified AR-180 upper receiver formed from heat treated SAE 4130 steel. Standard features of the rifle include an A2-style flash hider, 20” chrome lined barrel with a 1-7” twist, FAL-style hand guard, and polymer side-folding stock.
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The aircraft has a newly designed welded 4130 steel tubing fuselage, covered in doped aircraft fabric. The wing is identical to the Patrol wing and is made from aluminum sheet components and is covered in flush-riveted aluminum sheet.
The aircraft fuselage is made from bolted-together aluminum tubing, while the landing gear and flight controls are fabricated from 4130 steel. The rotor has a diameter of 24 ft (7.3 m), while the propeller recommended is a Powerfin composite model with a diameter of 60 to 66 in (152 to 168 cm). With an empty weight of 254 lb (115 kg) and a ...
The aircraft structure consists predominantly of welded 4130 chromoly steel tubing. The kit provides the main and tail rotors, rotor hubs, transmission, engine, cockpit and tailboom completed. Builder construction is largely assembly. [5]
The aircraft is made from welded CNC-milled 4130 steel tubing, with its flying surfaces covered in doped aircraft fabric. Its 34.3 ft (10.5 m) span wing has an area of 174.8 sq ft (16.24 m 2) and mounts flaps. The controls are driven by torque tubes, instead of cables, with the aileron tubes running inside the V-struts.