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Updated: Sat Feb 27 17:56:17 UTC 2010
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APA NOTAMS ISSN 1836-7135
Navalising the F-22 Raptor
Restoring America's Maritime Air Dominance
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Air Power
Australia - Australia's Independent Defence Think Tank
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Air Power Australia NOTAM
23rd February, 2009
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| Contacts: |
Peter
Goon
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Carlo
Kopp |
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Mob:
0419-806-476 |
Mob:
0437-478-224 |
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F/A-22N
Sea Raptor: the US Navy will soon confront an
operational environment where any nation equipped with modern long
range aircraft such as the Su-27/30/35 Flanker will be able to
challenge a Carrier Strike Group with a saturation supersonic cruise
missile attack. Neither the F/A-18E/F Super Hornet nor the F-35C Joint
Strike Fighter will have the performance or stealth to deal with this
kind
of threat. The only technological choice available within a feasible
timeline and budget is a direct adaptation of the existing F-22A Raptor
(Authors).
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The 7th May, 1942 in the Battle of the
Coral Sea was the day when naval warfare changed forever. This
was the first fleet action in which aircraft carriers engaged each
other. It was also the first naval battle in history in which neither
side's ships sighted or fired directly upon each other. Although
technically a win for the Japanese Navy, its forces were sufficiently
weakened that in the subsequent Battle of Midway, the United States
Navy convincingly defeated the Imperial Japanese Navy. Since
then, the USN has never been defeated at sea.
The halcyon days of the USN projecting immense power wherever and
whenever they choose, may be at an end. The airborne torpedoes
and kamikazes of this era are supersonic sea-skimming anti-ship cruise
missiles, all developed in Russia, but now proliferating across the
Asia-Pacific Region, and being manufactured under licence by other
countries, such as India. India has bold plans to export over 500 of
the Kh-61/SS-N-26 Yakhont derived BrahMos.
The tridents that might pierce the hulls of the US Navy warships are:
the ’Carrier Buster’ Kh-41 or SS-N-22 ‘Sunburn’, which can have
conventional, thermobaric or nuclear warheads; the Kh-61 Yakhont /
BrahMos or SS-N-26 ‘Stallion’; and the devilishly clever 3M54 series or
SS-N-27 ‘Sizzler’, which cruises at subsonic speed to the vicinity of
the fleet, pops up at about 40 nautical miles for a radar fix, then
launches a Mach 2.7 supersonic manoeuvring ‘dart’ at the victim warship.
How will these attacks be delivered? The way to penetrate a
Carrier Strike Group’s (CSG’s) defences is to deliver unmanageable
swarms of missiles – technically termed a ‘saturation attack’ to
overwhelm the Anti-Ship Missile Defence Systems. The Soviets invested
enormous effort into the Operations Research underpinning this
tactic. To carry out such an attack, Flanker fighters can carry a
single Sunburn round, or three Sizzler rounds, or four Stallion /
BrahMos rounds. Venerable aircraft like the Tu-95M/Tu-142
Bear, the Tu-22M3 Backfire, and the new Chinese H-6K turbofan Badger
are all options for antiship strikes, and all can strike from long
ranges, carrying six or more such missiles per aircraft.
In an operational scenario, the US Navy’s E-2C/D Hawkeye fleet would be
able to detect the incoming Bears, Backfires or Badgers to scramble the
F/A-18E/F and F-35B/C aircraft for an effective intercept, even if the
strike aircraft arrive in a small fleet to deliver their swarm of
missiles.
So, if Bear, Backfire or Badger striker aircraft carry the anti-ship
missiles, they will need to be escorted by ‘offensive counter-air’
(OCA) Flankers. For these fighter escorts this is a
‘high-high-high’ altitude profile mission, so with an effective OCA
weapons load, the un-refuelled combat radius will be about 1,000
nautical miles with internal fuel and external tanks. All late
model Flankers have air-to-air refuelling capabilities, so this OCA
range could extend to 1,500 nm and well beyond with enough tanker
support. That’s a lot of blue water from which to exclude the US
Navy. These ranges are also significant, as the F/A-18E/F and the
F-35B/C struggle to exceed unrefuelled combat radii much beyond 600 nm
with any
useful weapons load.
So, if countries operating late model Flankers choose, they can
effectively neuter the USN by denying it access to targets within range
of carrier based shipboard attack aircraft.
Ehrhard and Work have cleverly proposed in a recent study that the US
Navy deploy highly stealthy 1,500+ nautical mile combat radius UCAVs
(Unmanned Combat Aerial Vehicles) from carrier decks to permit attacks
from outside the reach of land based bombers and fighters. This is a
sound and well thought out strategy, which forces land based bombers,
and especially their tanker refuelled fighter escorts, to operate at
very long ranges, which seriously reduces sustained sortie rates and
restricts deployable numbers. The ‘Ehrhard strategy’ solves part of the
puzzle, but not the entire puzzle. Subsonic UCAVs suffer the same
sortie rate limitations as subsonic cruising land based aircraft
attacking the fleet. They cannot eliminate the problem of long range
air attack on the fleet, but only reduce its intensity [1].
An attacker can play a more aggressive game than simply launching
swarms of supersonic sea skimmers. Suppose the enemy’s intent is
to inflict so much attrition upon the US Navy, that it is rendered
combat ineffective.
The first target is the E-2C/D Hawkeye Airborne Early Warning
(AEW&C) aircraft. Some Flankers will be armed with OCA
weaponry, others with the long-range R-172 or R-37 ‘AWACS-killer’
missiles – specifically designed to kill AEW&C aircraft at ranges
of up to 200 nautical miles. The OCA Flankers protect the
Flankers tasked with killing the AEW&C aircraft. The ensuing
air battle is likely to down a number of E-2C/D Hawkeyes, F/A-18E/F and
F-35B/C aircraft, bleeding the CSG’s air defences. Finally, the
full-strength anti-ship strike will be scheduled, with large numbers of
OCA Flankers escorting Striker Flankers and/or Bears, and/or Backfires,
and/or Badgers. If the surviving missile swarm exceeds the defensive
capability of the DDG escorts, then a lot of hulls will ‘turn turtle’.
A ‘Reversed Mariana’s Turkey Shoot’ and ‘Reversed Battle of Midway’,
all in one.
That is, current US Navy air power and operations planning will not be
able to protect its Carrier Strike Groups against existing and
developing global threats. A much more effective naval air combat
capability will be needed for the CSGs to survive.
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Supersonic
Sea Skimming Anti-Ship Cruise Missiles
Digital rendering of the air launched
supersonic sea skimming 3M-54AE Sizzler
being released from a navalised carrier based Su-33 Flanker D. The
Flanker can carry three rounds. China is procuring this long range
shipboard fighter for its planned fleet of aircraft carriers (Novator).
Su-35BM Flanker E+ external
stores configuration. Anti-ship missile loadouts include: 1 x Sunburn,
3 x supersonic
Sizzlers, 5 x Kayak
(Harpoonski), 5 x anti-ship Kingbolt, 4 x Stallion
(not drawn), or up to five subsonic cruise missiles such as the
baseline Sizzler (KnAAPO image).
A Russian Navy Su-33, derived from the land based Su-27S, on display
with a mixed payload of OCA weapons, and a centreline supersonic sea skimming Kh-41 Sunburn, carried using a special
cradle adaptor. The missile on the stand is a supersonic sea skimming
Kh-61 Stallion. Sukhoi/KnAAPO have migrated most of the
technology in the Su-33 to other Flanker variants.
The navalised Su-33 was the
first to introduce a retractable refuelling probe, similar to the F-14
design, as well as the UPAZ-1A Sakhalin buddy refuelling store. These
have since migrated to land based variants, providing a buddy tanking
option for Flanker users lacking full sized tankers.
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The answer to the naval air defence problem lies in the late Cold War
US Navy maritime
strategy model of ‘killing the archer, rather than the arrow’ – which
means engaging and destroying the attacking aircraft before they can
launch their lethal sea skimming supersonic payloads.
Late model Flankers such as the Su-35BM have a clear advantage over the
F/A-18E/F. Even with reduced radar signatures, the F/A-18E/F has
a residual signature that allows the Su-35BM to launch a PL-12, or
R-77M, or ramjet RVV-AE-PD at the kinematic limits of these missiles’
engagement envelopes – and with the Flanker higher and faster than the
Super Hornet, well outside its AIM-120C/D range envelope. So the
Flanker gets ‘free shots’ – and can carry lots of them. The
F/A-18E/F has some fine defensive electronic countermeasures and the
ALE-55 will seduce many of the incoming missiles – but not all.
The R-77M ‘Adder’ will have alternate active radar, heat-seeking and
passive anti-radar homing seeker heads, so any competent OCA force
would deliver a mix of these missiles in a mass firing. This is a
‘damned if you do, damned if you don’t’ situation for the Navy Hornets
– the radar and electronic counter measures are required to prosecute
attack on the Flankers, but will attract passive anti-radar homing
missiles. The missiles with heat-seeking guidance also present a
serious threat as their homing is not affected by the towed
decoy. Expect the exchange ratio to be about 4:1 in favour of the
Flanker E+.
The F-35 B/Cs might fare a bit better, but their Achilles’ heel is a
shortage of missile shots. A Flanker E+ can carry up to 10
long-range
missiles and 2 short range missiles, but not to a distance of 1,000
nm. At 500 nm or so, they can carry 8 long range missiles, and
can fire them all in a track-while-scan’ mode. The JSF’s reduced
signature forces engagements where both aircraft are within range of
the other’s missiles. However, the Flanker E+ has more missile
shots than the JSF; has modern DRFM Electronic Counter Measures; and,
possibly, a towed decoy where the F-35 has none. Long range
heat-seeking missiles pose the same danger to the JSF as to the Hornet.
Expect an exchange rate of at best about 1:1 between the Flanker E+ and
the JSF.
Both the Hornet and JSF lack the aerodynamic agility to out-turn
missiles. They also lack the speed essential to a safe
disengagement from a fight. Here is another thorny dilemma in
modern naval air warfare. If the US Navy defensive fighters stay
close enough to the fleet to be covered by the CG/DDGs’ Surface to Air
Missiles on egress, they have allowed the enemy to get within launch
range of their anti-shipping missiles; if they don’t, they will be cut
down during the egress to the carrier.
The argument which comes next is predictable – deploy an air combat
aircraft that can effectively ‘kill the archer’ and survive. This
aircraft is a ‘navalized’ F-22A – let us call it the ‘F/A-22N Sea
Raptor’. This is not the same as the cancelled Naval Advanced Tactical
Fighter (NATF). The US Navy wanted an advanced fighter, but the NATF
failed because the Navy wanted a de-facto new-technology F-14
engineered from F-22 components. This suggestion is the converse;
convert the F-22A into an F-14 replacement – a much lower risk and less
costly approach. The fiscal and timeline costs of restarting the early
1990s F-22 derived ‘swing wing’ NATF are simply out of feasible bounds.
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The
Naval Advanced Tactical Fighter (NATF) Proposals
| The stillborn NATF
represented a
failed attempt to create an "F-14-like" design from technology
developed
for the F-22 Raptor. As it amounted to an almost unique design, rather
than an
F-22 derivative, it did not survive the post-1991 "peace dividend". |
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Is that the choir that can be
heard singing a chorus of ‘you cannot do that!’? Well, suspend
disbelief and inter-service politics for a few minutes, and see what
might be done with a little imagination and old-fashioned pragmatic
American Engineering ‘know-how’.
Look at the remarkable overlay of a scaled image of the F/A-22N on a
line
drawing of the F-14D. Note the similarity of the size and weight
of the aircraft, although the F/A-22N has substantially more
thrust. To reduce the F/A-22N’s deck footprint – or spotting
factor
in naval language - its wings could be folded between the flaps and
aileron.
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Size
Comparison of F/A-22N Sea Raptor and F-14A Tomcat (NASA/C. Kopp)
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How about the approach and trap
speeds, critical for carrier operations? About 125 KIAS at 50,000
lbs gross weight would be useful - the F-35C approach speed is ~145
KIAS. There are several ways of
reducing the F/A-22N’s approach and landing speed (Refer Annex),
including using the Raptor’s thrust vectoring capability (TVC) though
this will require a means of providing a balancing pitching moment in
the Powered Approach (PA) configuration. One way this can be achieved
is by replacing the existing hinged nose-wheel doors with scissoring
lifting canards. Drop the gear and the lifting canards deploy
with a fixed positive angle of attack, providing lift and moving the
centre-of-pressure forward. The elevators in turn respond with
less ‘download’. This configuration has been modelled
and flown using a basic simulator as a comparator, with an F-22A
configured with such lifting canards allowing nicely controlled
approaches at 135 KIAS and traps at 125 KIAS. These speeds are
similar to the F-14, which having a similar gross weight on recovery,
results in similar momentum to be absorbed by the arrestor cable motors.
The canards would also assist in catapult launches, so with the F/A-22N
at its maximum takeoff weight of about 80,000 lbs, it should be within
the capacity of installed catapults. For comparison the F-14 MTOW is
around 75,000 lbs, but it has much less engine thrust available
compared to the F/A-22N.
It may be necessary to ‘beef-up’ the airframe in some places, but the
basic supersonic 9G rated structure is already there. Specific
design changes might include a carrier qualified 24 ft/sec sink rate
undercarriage, ‘beefing up’ the support and load transfer structure for
the stronger undercarriage, a navalised nose gear with catapult
launch bar, and a carrier rated arrestor hook for recoveries.
The USAF boom refuelling could be retained, and the F-35B/C aerial
refuelling probe added to the forward fuselage. So configured,
the F/A-22N would be able to take on fuel wherever it finds a friendly
tanker.
The avionic and systems build would be based on the Air Force Block 40
plus configuration, so an F/A-22N Sea Raptor would have the Block 40’s
full range of networking, air-to-air and air-to-ground strike
capabilities. Additional Navy datalinks and ACLS would be required.
Has this been done before? Well
yes. The Russians were able take the impressive Su-27S Flanker B and
re-engineer it into the world's best shipboard fighter, the Su-33
Flanker D. The French successfully converted the land based Rafale into
the Rafale M Navale. The idea that the experienced engineering cadres
of Northrop-Grumman or Boeing might lack the engineering skills to do
the same for the F/A-22N Sea Raptor, and do so efficiently, is
difficult to accept.
And the cost?
Pricing the Research and Development & Test and Evaluation,
Production Engineering & Tooling (the NRE Costs) for the lifting
canard, folding wings, undercarriage redesign, airframe strengthening
and marinising comes in at a rough-order-of-magnitude (ROM) cost of
around $230M (-10%/+30% variance). This figure includes an
appropriate margin for risk.
Over a production run of some 500 aircraft, the overall program cost,
as distinct from price charged, including amortisation of the NRE,
would add somewhat less than $10 million to the current F-22A
production cost of $142 million . . .and that is assuming “all new” for
any affected existing parts. However, the bulk of any affected
parts will likely be able to be modified/upgraded, thus becoming cost
effective ‘cousin parts’ like those extolled in the JSF Program for the
savings they will generate.
This is what one would call a classic capability bargain with superior
cost benefit for all (…except any opposing threats, of course).
You take an already outstanding aircraft, and make it even more
effective with an investment that is a tiny fraction of the cost of
developing a whole new aircraft type or, for that matter, the money
that still needs to be spent on trying to get the F-35B/C to meet its
already surpassed specification.
More savings come from the volume production. Current cost
estimate across the planned 91 x F-35B aircraft is ~ $158M a
copy. For the current production F-22A, this figure is $142M a
copy. A production run of over 700 Raptors will reduce this
latter unit price substantially, so the USAF, USN and the USMC are all
winners if the Sea Raptor numbers increase.
The ugly reality is that the US Navy is staring down the barrel of a
global environment where its underperforming Hornets and Super Hornets,
and planned to underperform F-35B/C Joint Strike Fighters are neither
viable as penetrating strike assets or actually capable of keeping the
fleet alive in the face of modern Russian designed supersonic sea
skimming weapons, which have proliferated on a global scale.
The F/A-22N Sea Raptor renders
the F-35C CV completely redundant, as it will provide around three
times the capability of the F-35C at similar unit procurement costs,
with a twin engine airframe better suited to naval operations. This
would permit cancellation of the F-35C, never a favourite with
professional naval aviators. The funding reserved for around 400 F-35Cs
would buy a similar number of F/A-22Ns, producing the same commonality
and economy of scale effects seen when the Air Force adopted the
F-4C/D, while the Navy and Marines flew the F-4B. Should the Marines be
equipped with the F/A-22N rather than the planned F-35B STOVL JSF, the
total build numbers for both services could be as high as 680 aircraft.
The F/A-22N provides, inherently, if not subjected to client or
contractor induced cost and capability creep, much higher cross-variant
commonality than the F-35 JSF does, driving down production costs with
increasing build numbers much more effectively.
Purchasing an aircraft with the ability to engage and defeat aircraft
possessing the air combat capabilities of the Su-35BM Flanker E+ is a
critical strategic decision for the United States. If it chooses
aircraft inferior to those of potential adversaries, then not only will
its Air Force risk annihilation in battle, but also the mighty power of
its Naval Carrier Strike Groups is likely to be terminated in the
second decade of this century. Without the navalized F/A-22N Sea
Raptor, the US Navy will find itself out of the business of blue and
brown water sea control, relegated to Third World counter-insurgency
support roles.
The F/A-22N ‘Sea Raptor’ is the only remaining choice.
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F/A-22N Sea Raptor in the
livery of
VFA-51, formerly the VF-51 F-14 squadron (C. Kopp)
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Endnotes:
[§] Peter Goon is a graduate of the US
Naval Test Pilot
School (USNTPS Class 80), Flight Test Engineer Course - 1981.
[1] Tom Ehrhard and Robert Work, Range,
Persistence, Stealth, and Networking: The Case for a Carrier-Based
Unmanned Combat Air System, Center
for Strategic and Budgetary Analysis, Washington DC, 18/06/2008, URI:
http://www.csbaonline.org/4Publications/PubLibrary/
R.20080618.Range_Persistence_/R.20080618.Range_Persistence_.pdf;
Robert Work and Tom Ehrhard, The
Unmanned Combat Air System Carrier Demonstration Program: A New Dawn
for Naval Aviation?, Center for Strategic and
Budgetary Analysis, Washington DC, 18/06/2008, URI:
http://www.csbaonline.org/4Publications/PubLibrary/
S.20070711.The_Unmanned_Comba/S.20070711.The_Unmanned_Comba.pdf
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Annex - F/A-22N
Sea Raptor vs F-22A
Design Changes
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Design Change
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Key Performance
Parameter (KPP)/Options
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Level of Risk
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CV Arrestor Hook
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KPP: No degradation in
VLO performance
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Option A
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Arrestor in VLO fairing
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LOW
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Option B
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VLO shaped external
Arrestor
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MED-LOW
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CV Main Undercarriage
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KPP: 24 ft/sec sink rate
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LOW
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CV Nose Gear
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KPP: Catapult rated; 24
ft/sec sink rate
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LOW
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Structural Enhancement
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KPP: No Significant BEW
Increase
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LOW
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Approach/Trap
Speed/Attitude Control
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KPP: F-14 class trap
momentum;
No degradation in VLO
performance
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Option A
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Nosewheel door lifting
canards
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LOW
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Option B
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Retractable shoulder
lifting canards
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MED
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Option C
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Non-retractable
shoulder lifting canards
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MED-LOW
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Option D
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Elevating spine winglet
(in place of Refuel Receptacle)
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MED-HIGH
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Option E
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Blown Flaps/Blown Wing
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MED-HIGH
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Outer Wing Fold
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KPP: No degradation in
VLO performance
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LOW
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Marinising/Corrosion
Treatment
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KPP: No degradation in
VLO performance
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MED-LOW
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Navy
Datalinks/ACLS/Antennas
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KPP: No degradation in
VLO performance
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MED-LOW
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F/A-22N
Sea Raptor simulation tailhook trap on a CVN angle deck (Authors)
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Russia's
carrier based Su-27K/Su-33 and Su-27KUB/Su-33UB Flanker D are direct
adaptations of the land based Su-27SK Flanker B design. China is
procuring this superb fighter for its planned fleet of aircraft
carriers (KnAAPO images).
The French successfuly adapted the land based Rafale to produce the
navalised catapult launched Rafale M (French MoD).
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Related Reading
Navalised
Su-33/33UB Flanker D
[Click for more ...]
Range, Persistence, Stealth, and
Networking: The Case for a Carrier-Based Unmanned Combat Air System
[Click for more ...] [Slides
Click for more ...]
Precision
Guided Munitions in the Region [Click for more ...]
Warship
Vulnerability [Click for more ...]
Assessing
Joint
Strike Fighter Defence Penetration Capabilities [Click for more ...]
Assessing
Joint Strike Fighter Air Combat
Capabilities [Click for more ...]
Surviving
the Modern Integrated Air Defence
System [Click for more ...]
The
Russian Philosophy of Beyond Visual Range Air Combat [Click for more
...]
F/A-18E/F
Super
Hornet
vs. Sukhoi
Flanker Analysis [Click for
more ...]
Sukhoi
Flanker Analysis [Click for
more ...]
F-22A
Raptor Analysis [Click for more
...]
Joint
Strike Fighter Analysis
[Click for
more ...]
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Air
Power Australia Website - http://www.ausairpower.net/
Air Power Australia Research and
Analysis - http://www.ausairpower.net/research.html
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![Australia's First Online Journal Covering Air Power Issues [ISSN 1832-2433]](apa-analyses.png "Australia's First Online Journal Covering Air Power Issues [ISSN 1832-2433]")
