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SUPERMARINE SEAFIRE FR47

The story which didn't happen ... outside Atlantic Air Combat
 

Specifications
Little could be done within the fuselage, as Supermarine had really squeeze the maximum in there, amounting to 1330 litres, small wing tanks inclusive.   In order to free the two only wing pylons for ordnance, a conformal 270 Imp Gal (1227 litres) belly fuel tank had been adopted by the British.   Surprisingly, this didn't affect the aircraft performances too much.   A any rate, a total of 2500 litres of fuel was certainly desirable, but engineers at KFFS thought that not only fuel tankage needed to be revised but also the gun layout.   Associated with the fact that only a small portion of the wing as foldable, it was decided to rebuilt the wing outside the gun box, with the guns themselves being removed, while a much stronger hinging mechanism was adopted.

Weapons Load

AF

Aircraft

Q

Cal

Guns
Internal

RPM

RPG

Pylon
Tips

Pylon
Outer

Pylon
Central

Pylon
Fuselage

HVAR
Type

Q
Wings















Attacker

4

20mm

HS404.MkV

750

500

1xAIM9B

500lbs

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1000lbs

-

4190

4

4

13

4

6

12

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Aircraft Thrust
Kgp
- Body Motor Main
Fuel
Main
Wings
Tips
Fuel
Belly
Fuel
Guns:500
x20mm
Pylons
Outer
500lbs
Pylons
Inner
1000lbs
HVAR Fuel
Total
Litres
Weight
Total
Kgs















FB.2
RB41
2270 Kg 3665 700 1011 - - 983 115 12x27
=328
454
454
12x37
444
- 7870
- - L - - 1330 - - 1227 - - - -
2557
-
J23
RM7
2350 Kg 3705 935 1011 1368 170 - 170 250
250
454
454
10x65
650
- 8767
- - L - - 1330 1800 - - - - 530
530
-
4190
-
Fuel

AF

Aircraft

Engine

SFC

Thrust
Kgp

Fuel
Main

Fuel
Wings

Fuel
Belly

Pylon
Outer

Pylon
Inner

Fuel
More

FUEL
LITRES















Attacker

Tay/RM7

0.92

3430

1330

1800

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-

1060

-

4190

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Fuel Capacity
Little could be done within the fuselage, as Supermarine had really squeeze the maximum in there, amounting to 1330 litres, small wing tanks inclusive.   In order to free the two only wing pylons for ordnance, a conformal 270 Imp Gal (1227 litres) belly fuel tank had been adopted by the British.   Surprisingly, this didn't affect the aircraft performances too much.   A any rate, a total of 2500 litres of fuel was certainly desirable, but engineers at KFFS thought that not only fuel tankage needed to be revised but also the gun layout.   Associated with the fact that only a small portion of the wing as foldable, it was decided to rebuilt the wing outside the gun box, with the guns themselves being removed, while a much stronger hinging mechanism was adopted.

If the wing was already holding a small fuel tank behind the wheel well, it now could hold a stunning total of 900 litres.  The wing pylons didn't need to be reinforced as they soon were cleared to carry loads of up to 1000 lbs (from the original 500 lbs).  It was hower modified to allow the carriage of external fuel tanks.  Outside of the new hinging position was now a second pylon intended to carry air-to-air missiles, either a pair of AIM-9B Sidewinder or a single AIM-7C Sparrow.   While not asked for by the Navy, KFFS maintained to possibility to carry HVAR rockets, either British made RP3 or Bofors 135mm, thus still offering the rebuilt Attacker a secondary attack role.   Finally, while KFFS refrained from making provision for wing tip fuel tanks, the new wing offered the possibility to install AIM-9B missiles at the tips (or 135mm HVAR for that matter).  Considering the extra weight of the new radar (see below) and new engine, ending up with a MTOW a mere 900kg higher than the original design while enjoying a 50% increase in available power, FKKS could be satisfied to have met the Navy requirement and beyond.

Aircraft Thrust
Kgp
- Body Motor Main
Fuel
Main
Wings
Tips
Fuel
Belly
Fuel
Guns:500
x20mm
Pylons
Outer
500lbs
Pylons
Inner
1000lbs
HVAR Fuel
Total
Litres
Weight
Total
Kgs















FB.2
RB41
2270 Kg 3665 700 1011 - - 983 115 12x27
=328
454
454
12x37
444
- 7870
- - L - - 1330 - - 1227 - - - -
2557
-
J23
RM7
2350 Kg 3705 935 1011 1368 170 - 170 250
250
454
454
10x65
650
- 8767
- - L - - 1330 1800 - - - - 530
530
-
4190
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Armament
Guns - As seen above, one of the items to be questioned was the gun layout.  The Hispano Suiza Mk5 autocannons were fine weapons, but positioning them in the wings sort of anihiliated their peformance, restricting the effective range to an aiming position roughly 500m ahead of the plane, beyond which shell disperstion reduced their effectiveness.   With the nose not being available for guns intallation, FKKS repositioned them in the conformal belly, allowing the gun quarted to be used to their full advantage..   Besides, no one could really be comfortable with the idea of making a wheels up landing on a belly filled with fuel vapors.   While the vast volume offered by this conformal belly was to be used for repositioning avionics from the nose, it nevertheless offered enough room to increase the amount of rounds per gun, now totalling 185rpg instead of the original 125rpg.

Air-to-Air Missiles - Initially, the quest was restriced to close range combat missiles, either British made FireStreak or US made AIM-4 Falcon.   In fact, the Swedish Air Force was already negociating the purchase of the Falcon missile but contacts between the Swedish and the US Navies lead the Swedes to select the Sidewinder.   Then, the US Navy was also developping a longer range missile, the AIM-7 Sparrow.   While still a highly classified item, Sweden had nevertheless been authorized to consider this weapon among their potential purchase.   Considering that threats to their Artic fleet could not only come in the form of carrier borne fighter-bombers but also in the form of long range bomber equipped with stand off weapons, the Sparrow was examined more closely before being adopted once the feasibility of a proper radar installation had been explored positively.

Radar - Sweden being one among few countries having almost full access to their military technonogy, compatibility of the Supermarine airframe with the APQ-51B X-band radar was examined with a positive result.  Although a tight fit for this relatively small sized aircraft, and quite a headache to solve the electrical circuitery and power issues it nevertheless fitted and offered the Swedish Navy with a true all weather interception capacity, with the radar offering a detection range of up to 28 NM for bomber sized targets, and 11 NM for fighter sized targets.

Wing Pylons - As mentioned, the original wing pylon was soon cleared for loads of up to 1000lb, essentially aimed to carry 530L fuel tanks, although they could be made to fire an 135mm HVAR, or carry more AIM-9B or AIM-7C air-to-air missiles, a rocket pod or even a pair of 500lb bombs (carried in tandem).  Then a second pylon was installed on the outer wing, essentially tailored to carry a pair of AIM-9B Sidewinder or a single AIM-7C Sparrow.  If needed, it could also carry a 500lbs bomb or any similar load.   These two pylons were spaced in such a manner that rocket rails could easily be installed under the wing, with one neatly placed between the two above mentioned pylons, plus another two further outboard of the external pylons.   As mentioned, contrary to what the Fleet Air Arm had done when developping the Attackeer F1 into the FB.2, the Swedish revised Attacker was not supposed to fulfill a secondary attack role.   However, FKKS did pay attention to properly design the underwing weapons carrying setup in order to offer maximum flexibility of use.  While in its original FB.2 format, the Attacker could carry RP3 rockets staged in pairs (for of total of 12), the carrying of RP3 was not compatible with the use of the under wing pylon.  The new wings were actually provided with 6 weapon positions, wing tips inclusive, vastly improving the potential of the aircraft.

Then, however cleverly re-designed, the Attacker wasn't intended for air-to-surface role and its typical armament would consist of two AIM-7C Sparrow on the outer wing positions, a pair of AIM-9B on the wing tips and a pair of 530 litres fuel tanks on the inner wing pylons, supplemented with the belly guns quartet.

Colors and Markings

Along the tradition of the Flygvapnet, the new F24 and F25 Wings were divided into three squadrons, the first Squadron showing Wing markings in red (X and Y being the 24th and 25th letter of the alphabet), the second squadron in blue and the third squadron in yellow.   Besides these typical Swedish markings, the aircrafts were finished in a not less typical medium green/grey topsides with pale grey underneath.

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Wing F24

1St Sq

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Wing F25

1St Sq

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Wing F24

2nd Sq

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Wing F25

2nd Sq

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Wing F24

3rd Sq

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Wing F25

3rd Sq

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