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The Hiduminium alloys or R.R. alloys are a series of high-strength, high-temperature aluminium alloys, developed for aircraft use by Rolls-Royce ("RR") before World War II. [1] They were manufactured and later developed by High Duty Alloys Ltd. [ 1 ] The name Hi - Du -Minium is derived from that of Hi gh Du ty Alu minium Alloys.
It is also commonly used in sheet metal applications such as gutters, downspouts, roofing, and siding. [ 1 ] Alternate designations include 3.0517 and A93003. 3003 aluminium and its various tempers are covered by the ISO standard 6361 and the ASTM standards B209, B210, B211, B221, B483, B491, and B547.
Downspouts are usually vertical and usually extend down to ground level, although may be routed at an angle to avoid architectural features and may discharge onto an intermediate roof. At the bottom of downspout there are typically features to divert discharged water away from the building's foundations to prevent water damage.
One feature found on most MP 38 and MP 40 submachine guns is an aluminum, steel, or Margolit (a variation of Bakelite) resting bar under the barrel. This was used to steady the weapon when firing over the side of open-top armored personnel carriers such as the Sd.Kfz. 251 half-track .
[4]: 9 The 6V-53 was available with either a cast iron or aluminum cylinder block. [ 4 ] : §1.1, 1 Turbocharged off-highway 6V-53T variants (model 5063-5300) had peak output ratings of 233 hp (174 kW) at 2500 RPM (gross) and 568 lb⋅ft (770 N⋅m) at 1800 RPM, with an 18.7:1 compression ratio, using 5A55 injectors.
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.