Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
- Little h
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Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
QEC Carriers; Folding polemast on Aft Island
I/We are aware of these...
I/We are aware of these...
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Last edited by Little h on Sun Feb 24, 2019 8:30 pm, edited 1 time in total.
Little h
- Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
Forrestal Class CV's; relocated hinged mast foremast.
I/We may well have known about these....
Source; and full article in the turnstiletours.com site.
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The following excerpt is taken from an article in Weapons and Warfare - History and Hardware of Warfare
The change in design to include a large island superstructure solved many problems posed by the flush deck design with its smoke pipes for stack gases and retractable bridge and electronic masts. The electronic suite on the new island included a large SPS-8 height finder radar atop a pedestal on the wheelhouse and a massive pole mast carrying an SPS-12 air search radar with a Tactical Air Navigation (TACAN) beacon at its top. A second large pole mast carried electronic countermeasures (ECM) antennas. These masts were both hinged so that they could be folded down (the larger center mast folded to port and rested on the flight deck while the smaller mast folded aft) for passage under the Brooklyn Bridge, which was a requirement for major naval ships at the time in order to have access to the New York Navy Yard in Brooklyn. An SPN-8 carrier-controlled approach (CCA) radar was mounted on the aft end of the island.
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Now looking of images showing the second large pole mast folded aft
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I/We may well have known about these....
Source; and full article in the turnstiletours.com site.
-------------------------------------------------------------------
The following excerpt is taken from an article in Weapons and Warfare - History and Hardware of Warfare
The change in design to include a large island superstructure solved many problems posed by the flush deck design with its smoke pipes for stack gases and retractable bridge and electronic masts. The electronic suite on the new island included a large SPS-8 height finder radar atop a pedestal on the wheelhouse and a massive pole mast carrying an SPS-12 air search radar with a Tactical Air Navigation (TACAN) beacon at its top. A second large pole mast carried electronic countermeasures (ECM) antennas. These masts were both hinged so that they could be folded down (the larger center mast folded to port and rested on the flight deck while the smaller mast folded aft) for passage under the Brooklyn Bridge, which was a requirement for major naval ships at the time in order to have access to the New York Navy Yard in Brooklyn. An SPN-8 carrier-controlled approach (CCA) radar was mounted on the aft end of the island.
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Now looking of images showing the second large pole mast folded aft
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Last edited by Little h on Sun Feb 24, 2019 9:42 pm, edited 4 times in total.
Little h
- Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
Tarawa Class LHA's; hinged topmast/foretop
I certainly had never observed this feature on this class of LHA ... even though I had submitted posts relating to this class of ship on the WNSF.
1st & 2nd attachments; show the hinged topmast/foretop in raised (vertical) orientation.
3rd & 4th attachments; show the hinged topmast/foretop in the lowered (horizontal) orientation.
5th attachment; shows USS Tarawa LHA-1 with her hinged topmast/foretop mid cycle having transitted under the bridge.
Caption reads:- San Diego, California - December 1986
Attribution; 2nd & 4th attachments from photostream by mtfrazier on Flickr copied under creative commons licence
I certainly had never observed this feature on this class of LHA ... even though I had submitted posts relating to this class of ship on the WNSF.
1st & 2nd attachments; show the hinged topmast/foretop in raised (vertical) orientation.
3rd & 4th attachments; show the hinged topmast/foretop in the lowered (horizontal) orientation.
5th attachment; shows USS Tarawa LHA-1 with her hinged topmast/foretop mid cycle having transitted under the bridge.
Caption reads:- San Diego, California - December 1986
Attribution; 2nd & 4th attachments from photostream by mtfrazier on Flickr copied under creative commons licence
You do not have the required permissions to view the files attached to this post.
Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
Tarawa Class LHA's; hinged topmast/foretop - (continued)
USS Belleau Wood (LHA-3) San Diego bay navsource 11 October 1991
USS Belleau Wood (LHA-3) 1991 navsource mast hinged down
USS Belleau Wood (LHA-3) San Diego bay navsource 11 October 1991
USS Belleau Wood (LHA-3) 1991 navsource mast hinged down
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Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
.... and have found some images of the second large pole (mainmast) folded aft, see:-Little h wrote: ↑Sun Feb 24, 2019 8:25 pm Forrestal Class CV's; relocated hinged mast foremast. - (continued)
The following excerpt is taken from an article in Weapons and Warfare - History and Hardware of Warfare
The change in design to include a large island superstructure solved many problems posed by the flush deck design with its smoke pipes for stack gases and retractable bridge and electronic masts. The electronic suite on the new island included a large SPS-8 height finder radar atop a pedestal on the wheelhouse and a massive pole mast carrying an SPS-12 air search radar with a Tactical Air Navigation (TACAN) beacon at its top. A second large pole mast carried electronic countermeasures (ECM) antennas. These masts were both hinged so that they could be folded down (the larger center mast folded to port and rested on the flight deck while the smaller mast folded aft) for passage under the Brooklyn Bridge, which was a requirement for major naval ships at the time in order to have access to the New York Navy Yard in Brooklyn. An SPN-8 carrier-controlled approach (CCA) radar was mounted on the aft end of the island.
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Now looking of images showing the second large pole mast folded aft
these pages provide images from a variety of angles:-
Source of the images above is:- navysite.de USS Saratoga (CVA 60) - Commissioning Cruise Book 1952-56 - in the 'Table of Contents:' scroll down and click on 'Construction' then view the pages in turn
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Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
The ubiquitious hinged/folding deck edge masts supporting communications wire aerials/antenna (fishing rods) - but noted having appendages (inboard when raised - upwards when lowered)
Observed in photographs/images of:-
Majestic Class built for RN - HMS Terrible R93
Majestic Class in RAN service - HMAS Sydney R17 (built as HMS Terrible R93); HMAS Melbourne R21
Majestic Class in RCN service - HMCS Magnificent CVL21
What purpose/function did these appendages fulfill?
Observed in photographs/images of:-
Majestic Class built for RN - HMS Terrible R93
Majestic Class in RAN service - HMAS Sydney R17 (built as HMS Terrible R93); HMAS Melbourne R21
Majestic Class in RCN service - HMCS Magnificent CVL21
What purpose/function did these appendages fulfill?
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Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
HF/DF but not as we think we know it .... nope, this is HF/DF FAA aircraft carrier and Naval Air Station style
When thinking about HF/DF we generally think about submarine hunting, triangulation etc.; but the system has always had another use - that being the provision of offering a reciprocal bearing for aircraft (mainly) along/down which they/it could fly towards a landing platform or airfield.
Enter the equipment type AH-6
... and; so to the S25B aerial array and the folding mast atop which they were mounted. This post ends with two examples, but further posts will try to identify some differences in the mast configurations.
HMAS Melbourne R21; 1st image shows the mast and bird cage (S25B) in raised (no flying ops) position .... however the 2nd of these two images shows the only evidence I have found (so far) on-line of the mast in lowered position (stowed) rotated down to the horizontal and stowed facing aft.
When thinking about HF/DF we generally think about submarine hunting, triangulation etc.; but the system has always had another use - that being the provision of offering a reciprocal bearing for aircraft (mainly) along/down which they/it could fly towards a landing platform or airfield.
Enter the equipment type AH-6
... and; so to the S25B aerial array and the folding mast atop which they were mounted. This post ends with two examples, but further posts will try to identify some differences in the mast configurations.
HMAS Melbourne R21; 1st image shows the mast and bird cage (S25B) in raised (no flying ops) position .... however the 2nd of these two images shows the only evidence I have found (so far) on-line of the mast in lowered position (stowed) rotated down to the horizontal and stowed facing aft.
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Little h
- Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
HF/DF but not as we think we know it .... nope, this is HF/DF FAA aircraft carrier and Naval Air Station style - (continued -1)
Note that the mast surmounted by AH6 HF/DF array appears to be mounted in such a manner as to suggest the mast (in the lowered position) may be swivelled/rotated so as to face aft.
Note that the mast surmounted by AH6 HF/DF array is mounted at the deck edge on port qtr not stbd qtr.
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Back to RAN; note that the Sydney R17 has the mast surmounted by AH6 HF/DF array mounted on a similar base to that of Melbourne which suggests that the mast may also fold down to a stowed position facing aft (nearly parallel with deck edge)
Note that the mast surmounted by AH6 HF/DF array appears to be mounted in such a manner as to suggest the mast (in the lowered position) may be swivelled/rotated so as to face aft.
Note that the mast surmounted by AH6 HF/DF array is mounted at the deck edge on port qtr not stbd qtr.
-----------------------------------------------------------------
Back to RAN; note that the Sydney R17 has the mast surmounted by AH6 HF/DF array mounted on a similar base to that of Melbourne which suggests that the mast may also fold down to a stowed position facing aft (nearly parallel with deck edge)
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Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
HMS Ark Royal (91) (ordered in 1934 Build Programme from Cammell Laird of Birkenhead and entered service in November 1938)
............... The Arrester gear was also of improved design as was another novel feature, a hinged telescopic mast sited in the centre of the Flight Deck for navigation lights.
The passage (underlined above) is taken from naval-history.net and is contained within a piece under the following header/title:-
SERVICE HISTORIES of ROYAL NAVY WARSHIPS in WORLD WAR 2
by Lt Cdr Geoffrey B Mason RN (Rtd) (c) 2003
HMS ARK ROYAL - Fleet Aircraft Carrier including Convoy Escort Movements
Editing & Additional Material by Mike Simmonds
Having read the passage and with my interest in this arrangement suitably piqued - I'm left wondering if anyone on the forum has viewed an image of this installation?
............... The Arrester gear was also of improved design as was another novel feature, a hinged telescopic mast sited in the centre of the Flight Deck for navigation lights.
The passage (underlined above) is taken from naval-history.net and is contained within a piece under the following header/title:-
SERVICE HISTORIES of ROYAL NAVY WARSHIPS in WORLD WAR 2
by Lt Cdr Geoffrey B Mason RN (Rtd) (c) 2003
HMS ARK ROYAL - Fleet Aircraft Carrier including Convoy Escort Movements
Editing & Additional Material by Mike Simmonds
Having read the passage and with my interest in this arrangement suitably piqued - I'm left wondering if anyone on the forum has viewed an image of this installation?
Little h
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Re: Masts (or section thereof); hinged and/or folding - mechanical or hydraulic
Observed in the attachment contained in a post (copied below) in the Aircraft Carrier; HMCS Bonaventure thread of the Canadian Navy forum.
Aircraft Carriers: HMCS Bonaventure
Post by Brian James » Tue Jul 16, 2019 2:25 am
Prestonian Class ASW Escort Frigate HMCS Swansea being refueled from Majestic Class Light Fleet carrier HMCS Bonaventure...1959
Note that the whip aerial has a tilting motor that is so configured as to tilt the whip to a horizontal position in the general fore & aft orientation. Other images of this ship show her with all(?) tilting whips lowered to a horizontal position pointing outboard to port or stbd - this includes the fishing rod folding mast arrays.
Q. would this particular whip be so configured because of it's proximity to the RAS point?
Aircraft Carriers: HMCS Bonaventure
Post by Brian James » Tue Jul 16, 2019 2:25 am
Prestonian Class ASW Escort Frigate HMCS Swansea being refueled from Majestic Class Light Fleet carrier HMCS Bonaventure...1959
Note that the whip aerial has a tilting motor that is so configured as to tilt the whip to a horizontal position in the general fore & aft orientation. Other images of this ship show her with all(?) tilting whips lowered to a horizontal position pointing outboard to port or stbd - this includes the fishing rod folding mast arrays.
Q. would this particular whip be so configured because of it's proximity to the RAS point?
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Little h