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Type 23, Development & Variants

RP1

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A thread to discuss Type 23 variants (Originally European / UK AAW projects that arose after the split in the Horizon project (I thought there already was a thread on this, but I couldn't find it), but changed to reflect actual content).

Firstly, the "stretched" Type 23 proposed by Yarrow in 1990.

(Source: Not sure, I scanned it in a year ago. The anchor icon and overall layout makes me think it was RINA's "Warship Technology", back when it was an insert in The Naval Architect).

Editorial:

I will go on record right now as saying that the "eyebrow of healthy skepticism" is raised over this design - the length / depth ratio is "a bit" higher than one would like - and the split VLS will only increase the bending moment.

RP1
 

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M. A. Rozon

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Re: Post-Horizon AAW Projects

THANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

:) ;D ::) B)

Having heard of this before, I had little or no info. Again, thanks.
 

TinWing

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Re: Post-Horizon AAW Projects

RP1 said:
I will go on record right now as saying that the "eyebrow of healthy skepticism" is raised over this design - the length / depth ratio is "a bit" higher than one would like - and the split VLS will only increase the bending moment.

It looks like a lot of topweight, which would seem to necessitate a fair amount of ballast, hence the depth.

I would also think that the final full load displacement would have been substantially more than the listed figure?

I also have to wonder about adding so many short splices to the hull. Obviously, the opposite approach was taken with the Type 42 Batch 3s, with obvious consequences?
 

Thorvic

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Re: Post-Horizon AAW Projects

Didnt they look at a fitting the aft VLS launchers for Sea wolf and a CIWS as an improved stretched Type 23 for some of the later ships in the batch ?

G
 

JohnR

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Re: Post-Horizon AAW Projects

M. A. Rozon said:
THANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

:) ;D ::) B)

Having heard of this before, I had little or no info. Again, thanks.

May I add my thanks. FAAAAAAB!!!!!!!!!!!!

What was the planned radar fit, is the array on top of the foremast a predecessor to Sampson?

I like the concept of the missile silo's either side of the hangar. I would hope that the designers had learned from the mistakes of the T42/3 and provided enough additional hull strength.

What about an increase in the beam that would help top weight without increasing draft? This was done to the Type 42/3.

Thorvic said:
Didnt they look at a fitting the aft VLS launchers for Sea wolf and a CIWS as an improved stretched Type 23 for some of the later ships in the batch ?

G

I also recall reading; I believe in Strategy and Defence -a long time ago so I am not sure, that there were plans to insert a Sea Wolf VLS in the "cut out" on the stbd side of the hangar. I also seem to recall a proposal for fitting an additional Spey??? But again it's a dark and murk memory which may not be that accurate.
 

RP1

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Re: Post-Horizon AAW Projects

<London accent> "You lucky, lucky people!" </London accent>

Failing to complete the Evening Standard crossword clearly motivated my brain, since I remembered where I put this and scanned it.

(Included in this thread because it directly mentions the AAW version - note the reference to both NAAWS (ESSM) and FAMS (ASTER).

Source: "Yarrow Shipbuilders Limited Type 23 Frigate", a special supplement of Naval Forces, No. III / 1989, Vol. X

RP1
 

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RP1

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Re: Post-Horizon AAW Projects

is the array on top of the foremast a predecessor to Sampson?

Yes - Sampson used to have a prismatic masthead structure, being changed to a spherical version some point in the late 1990's.

I would hope that the designers had learned from the mistakes of the T42/3 and provided enough additional hull strength.

This is the source of my concerns - the length / depth ratio for this design is very high, and additional structure would almost certainly be required, possibly in the external form used on the later Type 42's.

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Abraham Gubler

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Re: Post-Horizon AAW Projects

This thread would appear to be more Type 23 variants than Post Horizon AAW... Which leads me to ask does anyone have any information on the Type 23 variant that was shortlisted for the joint RAN RNZAN ANZAC frigate project. This was supposed to have been a "scaled down" Type 23 andwas selected alongside the B+V MEKO 200 and Royal Schelde M Class in August `1987 but dropped from the shortlist in November.
 

RP1

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

does anyone have any information on the Type 23 variant that was shortlisted for the joint RAN RNZAN ANZAC frigate project. This was supposed to have been a "scaled down" Type 23 andwas selected alongside the B+V MEKO 200 and Royal Schelde M Class in August `1987 but dropped from the shortlist in November.

Maybe. The YSL publication describes several variants, but not who they may have been developed for.

RP1
 

JohnR

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

Once again thank you!!!!

Just a quickie question from the text of your scan, didn't the Deadeye laser guided round die.
Sorry trying to wax poetical.

Regards.
 

RP1

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

didn't the Deadeye laser guided round die.

Yes:

From http://www.globalsecurity.org/military/library/report/1993/MCT.htm

The 5-inch semi-active laser guided
projectile (SALGP), named Deadeye, successfully completed
operational testing at sea and was approved for fleet use in
1982.9 The round has a combination high explosive/conical shape
charge warhead allowing it to penetrate approximately 27 inches
of rolled homogeneous armor or the equivalent of a T54-type tank;
and it is highly accurate with laser designation giving the round
a 2 meter CEP.10 Deadeye is a rocket assisted projectile (RAP),
which increases 5-inch gun range to 15 NM.11 The 5-inch SALGP
round was designed using an earlier 5-inch infra-red guided
projectile body that optimized flight in an anti-air warfare
role. However, if the 5-inch SALGP body is redesigned to
aerodynamically optimize surface to surface flight, the range can
be increased to 30 NM, and the addition of Global Positioning
System (GPS) guidance would yield a 16 meter CEP independent of
laser designation.12 The Deadeye fell victim to budgetary cuts
in FY 1989, and was not funded for production.
13 Re-introduction
of the Deadeye program and its redesign would be the most rapid
route to give the fleet a highly accurate shipboard hard-target
kill capability.

RP1
 

JohnR

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

Thought so, thanks RP1.

The last comment of the text is quite interesting and I wonder if it would still apply.

Regards.
 

nova10

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Pre-Falklands Type 23 frigate

Does anyone have any pictures of the Type 23 frigate design before the Falklands. Apparently it had no hanger, no SSMs, no VL Seawolf and was armed only with a 76mm gun and two torpedo tubes. Quite a different ship to the one the Royal Navy finally received.
 

RP1

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Re: Pre-Falklands Type 23 frigate

Yes, I have a set of 3 profile views showing the development of the design from a basic towed-array "tug" to something close to the final design. I also have a profile of one of the Type 25 designs. I will dig them out from my home PC and edit this post accordingly to-morrow.

RP1
 

RP1

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Re: Pre-Falklands Type 23 frigate

OK, so I made a new post rather than editing the last.

The development of the Type 23 both from the overall ship design perspective and details such as hullform parameterisation and design, machinery, materials selection etc, has been quite well documented in published papers and is used as an example in the MSc courses in Naval Architecture at UCL (the modern day version of the RCNC NA course).

Three files are attached:

pre_type_23_design.png

Labeled as "Original Type 23" in reference [1], but is similar in some respects to "Another, cut-price study on the way to the Type 23" in [2]. Note 76mm fwd with some kind of tracker over the bridge. An off-the-shelf surveillance radar (I forget the type, but it was used in other studies of the period), and SCOTT abeam of the mast. What appear to be (Sea Gnat) decoy launchers amidships with STWS (not MTLS) and a flight deck only for SKR (EH-101 Merlin).

type_23_evolution.png
late_type_23_design.png

Both of these are from reference [3].

Note change from SSGW only on the 100m design (with STWS amidships and decoys only for AAW?) though a "single headed" Sea Wolf system with SCG on the bridge wings, MTLS and a hangar to the final design. The artists impression is interesting in that it retains the 76mm gun, which seems to originally have been an option on the low cost studies before being deleted, then put back as the design grew after the Falklands lessons were incorporated before being replaced by the 4.5 inch Mk 8 at the last minute.

RP1

References:

[1] Easton, RWS: "The Modern Anti-submarine Frigate", Proc. of Warhip 87: Int. Symp. on Anti-Submarine Warfare, 11-13 May 1987 ,London: RINA
[2] Brown, D K & Moore, G: "Rebuilding the Royal Navy", London: Chatham Publishing, 2003
[3] Bryson, L: "The Procurement of a Warship", Trans. RINA, Vol.127, London: RINA, 1985
 

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Hood

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

'Ships of the World's Navies' by Christopher Chant, 1990, offers some glimpses at these lengthened variants above but the details don't quite gel.
He states, "there was the strong possibility that the third batch of four ships would be lengthened by 23ft (7m) to allow one or two Goalkeeper CIWS mountings to be carried on each ship, but in 1989 it was revealed that such would not be the case."
He goes on to say that later in 1989 the RN was considering an enhanced 'Duke' with a 32.8ft (10m) longer hull, missile capacity increased to 48 (40 forward and 8 aft) and two Goalkeeper CIWS. He then says that even further into the future there might be an anti-air optimised variant. Would this be the genesis of the Type 45?
 

RP1

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

Would this be the genesis of the Type 45?


More specifically, it would be one of the 8 or 9 separate projects for a new AAW destroyer that occurred between T42 and T45. T45 has very little derived from T23.


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JFC Fuller

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

Warship 1990 explicitly states that the order that took the T23 programme to 10 hulls (Westminster, Northumberland and Richmond- ordered from Swan Hunter in 1989) would not consist of stretched units, this implies that at one point and extended hull was at least under consideration. The stretched versions would have taken the T23 closer to the weapons capability of the T22 Batch III which did later get Goalkeeper.
 

thebig C

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Re: Type 23 Variants (RENAMED: Was Post-Horizon AAW Projects)

Excellent info regarding the enhansed Typr 23s!
Weren't there also a "shipload" of downgraded export variants?!

C
 

JFC Fuller

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Re: Pre-Falklands Type 23 frigate

Excellent Journal of Naval Engineering Article on Type 23 development and how/why various bits of capability were added and some of the reasons for certain design choices (e.g. SSGW launcher locations).

Also, could we merger this thread with this one: http://www.secretprojects.co.uk/forum/index.php/topic,7858.0.html

Indeed ! Topics merged, thank you !
 

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