L-port & T-Port valves look very similar but they have differences that make each the most suitable for some applications. Note: In the following photos, the markings on the handle indicate which ports are open. L-Port valves; L-Port valves have a ball that joins two adjacent ports. Traditionally, they are used to direct flow between the centre. Id do 3 6 inch aero ports. 2 isnt enough for 6 cu ft. Thatd be a 9 sq of port to 1 cu ft. In truth 1 larger well designed slot port will be more efficent then a bunch of aeros unless your gonna find a 10 inch aero lol. Slot ports are typically made from wood and have a square or rectangular opening.The port shown in Figures L and M extends into the enclosure only 12”, even though its total length is 12.75” JL Audio calculating displacement of square port. Remember, just like the round port, only use the length that extends into the enclosure when.
Port and starboard are nautical terms of orientation that deal unambiguously with the structure of vessels. Their structures are largely bilaterally symmetrical, meaning they have mirror-image left and right halves if divided sagittally.
One asymmetric feature is that on ships where access is at the side, this access is usually only provided on the port side.
Side[edit]
Port and starboard unambiguously refer to the left and right side of the vessel, not the observer. That is, the port side of the vessel always refers to the same portion of the vessel's structure, and does not depend on which way the observer is facing.
The port side is the side of the vessel which is to the left of an observer facing the bow, that is, facing forward towards the direction the vehicle is heading when underway, and the starboard is to the right of such an observer.[citation needed]
L Port Vs Slot Port Sub Box
This convention allows orders and information to be given unambiguously, without needing to know which way any particular crew member is facing. [1][2]
Etymology[edit]
The term starboard derives from the Old Englishsteorbord, meaning the side on which the ship is steered. Before ships had rudders on their centrelines, they were steered with a steering oar at the stern of the ship on the right hand side of the ship, because more people are right-handed.[1] Since the steering oar was on the right side of the boat, it would tie up at the wharf on the other side. Hence the left side was called port.[4] The Oxford English Dictionary cites port in this usage since 1543.[5]
Formerly, larboard was often used instead of port. This is from Middle Englishladebord and the term lade is related to the modern load.[2]Larboard sounds similar to starboard and in 1844 the Royal Navy ordered that port be used instead.[6] The United States Navy followed suit in 1846.[7]Larboard continued to be used well into the 1850s by whalers.[citation needed]
An Anglo-Saxon record of a voyage by Ohthere of Hålogaland used the word 'bæcbord' ('back-board') for the left side of a ship. The words for 'port side' in other European languages, such as German Backbord, Dutch bakboord, Spanish babor, and French bâbord, are derived from the same root.
Importance of standard terms[edit]
The navigational treaty convention, the International Regulations for Preventing Collisions at Sea—for instance, as appears in the UK's Merchant Shipping (Distress Signals and Prevention of Collisions) Regulations 1996 (and comparable US documents from the US Coast Guard)[8]—sets forth requirements for maritime vessels to avoid collisions, whether by sail or powered, and whether a vessel is overtaking, approaching head-on, or crossing.[8]:11-12 To set forth these navigational rules, the terms starboard and port are absolutely essential, and to aid in in situ decision-making, the two sides of each vessel are marked, dusk to dawn, by navigation lights, the vessel's starboard side by green and its port side by red.[8]:15Aircraft are lit in the same way.
See also[edit]
- Anatomical terms of location, another example of terms of directionality that do not depend on the location of the observer for things that are bilaterally symmetrical
References[edit]
| Look up bæcbord, larboard, starboard, or port in Wiktionary, the free dictionary. |
- ^ abNOS Staff (December 8, 2014). 'Why Do Ships use 'Port' and 'Starboard' Instead of 'Left' and 'Right?''. NOAA National Ocean Service (NOS) Ocean Facts. Washington, DC: U.S. Department of Commerce, National Oceanic and Atmospheric Administration (NOAA). Retrieved February 2, 2017 – via OceanService.NOAA.gov.
- ^ abRMG Staff (February 2, 2017). 'Port and Starboard: Why do Sailors say 'Port' and 'Starboard', for 'Left' and 'Right?''. Discover: Explore by Theme. Greenwich, England, UK: Royal Museums Greenwich. Retrieved February 2, 2017 – via RMG.co.uk.
- ^Grape, Wolfgang (1994). The Bayeux Tapestry: Monument to a Norman Triumph. Art and Design Series. Munich, DEU: Prestel. p. 95. ISBN978-3791313658. Retrieved February 2, 2017.
- ^Administration, US Department of Commerce, National Oceanic and Atmospheric. 'Unlike left and right, port and starboard refer to fixed locations on a vessel'. oceanservice.noaa.gov. Retrieved 2017-10-12.
- ^'port'. Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005.(Subscription or UK public library membership required.)
- ^Norie, John William; Hobbs, J. S. (1847) [1840]. Sailing directions for the Bay of Biscay, including the coasts of France and Spain, from Ushant to Cape Finisterre ('A new ed., rev. and considerably improved' ed.). C. Wilson. p. 1. OCLC41208722. Retrieved 7 February 2010.
An order, recently issued by the Lords Commissioners of the Admiralty, states, that in order to prevent mistakes, which frequently occur from the similarity of the words starboard and larboard, in future, the word port is to be substituted for larboard, in all Her Majesty's ships or vessels.
- ^George Bancroft (February 18, 1846). 'Port and Starboard: General Order, 18 February 1846'. General Orders. Washington, DC: US Navy, Naval History and Heritage Command (NHHC). Retrieved February 2, 2017 – via History.Navy.mil.
- ^ abcMCA Staff (2004) [1996]. The Merchant Shipping (Distress Signals and Prevention of Collisions) Regulations 1996(PDF). Southampton, ENG: Crown Department of Transport, Maritime and Coastguard Agency (MCA). Retrieved 2 February 2017.