Could the Spitfire have equalled the Mustang in range and capability as an escort? Paul Stoddart examines some development options and suggests what might have been achieved.

Notes: All fuel capacities stated in this article are in Imperial gallons (equal to 1.20 US gallons). Fuel tank capacities (and other aircraft figures) often vary somewhat from source to source. The author has used either the most common or the most authoritative figure. The actual variations are, in any case, so small as to make no difference to the essential argument and findings.

“The war is lost”, said Luftwaffe chief Herman Goering, on seeing Mustangs flying over Berlin. It was a remarkable achievement, a single-engined fighter with the range of a bomber. P-51s based in south-east England could fly the 1,100-mile round trip yet still win air superiority deep in Germany. The first such missions were flown in March 1944 and they were decisive. Merlin-powered Mustangs enabled the USAAF Eighth Air Force to prosecute its daylight campaign without the crippling losses it endured during 1943. The question remains, could Spitfires have flown that mission and flown it a year earlier? Could the Mk IX have taken on that role from the autumn of 1942? It is arguable that earlier success of the Eighth’s campaign would have hastened the end of the war in Europe. Bringing VE-Day forward even by a few months would have had significant implications and benefits; in particular, a smaller proportion of Central Europe might have fallen under Soviet control. The distinguished historian, Hugh Trevor-Roper once commented, “History is not merely what happened; it is what happened in the context of what might have happened. Therefore it must incorporate the might-have-beens.” An escort Spitfire was a might-have-been with much potential but before assessing the possible development routes, the actual design and development of the aircraft should be considered. To put the analysis in context, the role of the escort in the Eighth’s campaign will also be described.

Spitfire: Range on Internal Fuel

Although the Spitfire remained in the front rank of fighters throughout World War II, it never made the grade as a long-range escort. Specified as a short-range interceptor with the emphasis on rate of climb and speed, it is unsurprising that fuel load was not the Spitfire’s strongest suit. Throughout its life, the core of the Spitfire fuel system remained essentially similar although with several variations on the theme (See table 1). The Mk I carried 85 gallons of petrol internally in two tanks immediately ahead of the cockpit. The upper tank held 48 gallons and the lower 37. This arrangement was used in the majority of the Merlin fighter marks: II, V, IX and XVI. (By comparison, the Bristol Bulldog of 1928, with only 490 hp, carried 106 gallons). Later examples of the Mk IX and Mk XVI featured two tanks behind the cockpit with 75 gallons (66 gallons in the versions with the cut down rear fuselage). The principal versions of photo-reconnaissance Spitfires used the majority of the leading edge structure as an integral fuel tank holding 66 gallons per side. As this required the removal of the armament, it was not an option for the fighter variants. Capacity was increased in the Mk VIII (which followed the Mk IX into service) with the lower tank enlarged to fill its bay and holding 48 gallons. Each wing also held a 13-gallon bag tank in the inboard leading edge (between ribs 5 and 8) to give a total internal load of 122 gallons, a 44% increase on its forerunners. Eighteen gallon leading edge bag tanks were also fitted in some late Mk IXs. Fitting the Griffon in the Spitfire’s slim nose displaced the oil tank from its original ‘chin’ position to the main tank area. This reduced upper tank capacity by 12 gallons but all Griffon Spitfires, bar some Mk XIIs, featured the 48-gallon lower tank. It is worth noting that the PR Mk VI had a 20-gallon tank fitted under the pilot’s seat although no other mark of Spitfire appears to have used this option. On 85 gallons of internal fuel, the Mk IX had a range of only 434 miles; the Mk VIII, reaching 660 miles on 122 gallons, was still short on reach.

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Table 1. Spitfire Internal Fuel Capacity

Spitfire Range Extension – External Fuel

The slipper tank was the standard range extender on the Spitfire and some 300,000 were built in a variety of capacities and materials. Fitted flush on the fuselage underside ahead of the cockpit, the slipper tank was essentially a trough whose depth varied in proportion to volume. The 30, 45 and 90-gallon versions were used on fighter missions with the 170-gallon tank reserved for ferry flights only. The drag penalty imposed by slipper tank carriage was relatively high compared to the later ‘torpedo’ style drop tanks that were mounted on struts clear of the fuselage (see table 2). Compared with the slippers, the torpedoes were little used. All tank types could be jettisoned although this was normally only done when operationally imperative.

In the USA, two Mk IXs were experimentally fitted with Mustang 62-gallon underwing drop tanks. These were of metal construction and of teardrop form. The Aircraft & Armament Experimental Establishment (A&AEE) at Boscombe Down tested the jettison properties of this tank from the Spitfire. At 250 mph, the tanks jettisoned cleanly but at 300 mph the tail of the tank rose sharply and struck the underside of the wing heavily enough to dent the skin. Although this failing was presumably not beyond correction, the 62-gallon tank appears not have been adopted for operational use. Nor has the author found any record of even a trial fit of the underwing 90-gallon Mustang tank on the Spitfire. These tanks were of cylindrical form and made of a plastic/pressed paper composite. Filled just before use, they had only to remain fuel tight for the first two hours or so of the sortie after which they would be jettisoned. Unlike a discarded metal tank, the plastic/paper versions were of no value to the enemy and, being ‘one-use’ only were routinely jettisoned when empty.

Slippers and torpedoes – Spitfire drop tanks
Tank capacity (gal)	Tank type	Total tank drag (lb) at 100 ft/sec at sea level 100 ft/sec = 68 mph	Tank drag (lb) at 100 ft/sec at sea level per 30 gal	Relative tank drag at 100 ft/sec at sea level per 30 gal where 45 gal torpedo is unity
30	Slipper	6.7	6.7	3.53
45	Slipper	7.0	4.7	2.47
90	Slipper	8.8	2.9	1.53
170	Slipper	35.0	6.1	3.2
45	Torpedo	2.8	1.9	1.0
170	Torpedo	8.6	1.5	0.79

Table 2. Spitfire Drop Tanks: Capacity and Drag.

The Need for Long Range Escorts

The greatest need (and opportunity) for a long-range escort Spitfire was between August 1942, when the Eighth Air Force began its daylight campaign over Europe, and early 1944 when the Merlin Mustang appeared in strength. In August 1942, the Mk IX Spitfire was Fighter Command’s leading interceptor but, as it had only been in service for a month, the less capable Mk V still made up the bulk of front line strength. The Eighth’s first target (using the B-17E Flying Fortress) was the French town of Rouen and, given its proximity to England, Spitfires provided the escort. For targets deeper in Europe, the Spitfire’s short range was a severe limitation and precluded it as an escort. P-38 Lightnings arrived in the UK during the summer of 42 but this large aircraft (its empty weight was double that of the Mustang’s) was at a disadvantage in combat against the Messerschmitt Bf 109 and the nimble Focke Wulf Fw 190. The P-47 Thunderbolt began escort duties in April 1943 but even with 254 gallons of internal fuel (three times the Spitfire’s load) this thirsty beast lacked the range for deep escort. Adding a 166-gallon drop tank significantly increased the Thunderbolt’s radius of action (though not to Mustang standards) and long-range escort missions were flown from April 1943. Although a capable high level fighter, at low and medium altitudes the P-47 could not match the defending German interceptors for climb or manoeuvrability. It was the advent of the Merlin Mustang in December 1943 that firmly shifted the balance in favour of the Eighth Air Force.

During 1943, the Eighth suffered such heavy casualties as to make deep raids unacceptably costly.

The figures are sobering. In April, during a raid on Bremen, 16 bombers were lost out of 115; a loss rate of 14%; 4% is considered the maximum loss that can be sustained in the medium and long term. In June, 22 bombers were lost out of 66 (33%) and in July, 24 from 92 (26%) were downed; the targets were Kiel and Hanover respectively.

The case that fighter escort could have helped shorten the war is supported by the example of Schweinfurt. Lying to the east of Frankfurt, Schweinfurt was the centre of ball bearing production in wartime Germany. Ball bearings are essential for armaments and Allied target planners correctly identified the Schweinfurt plants as being crucial to the Nazi war effort. A raid in August 1943 cut production by 38%. According to Albert Speer, the Reich Minister of Armaments, prompt further attacks would have had a severe, even catastrophic, effect on the Nazi war machine. In the event, the heavy losses of the first raid delayed the second to October by which time production had been built up again. Despite this, the second raid reduced output by 67%. A further large-scale raid might well have been decisive but American losses were so severe that there was no follow-up. Of 291 bombers in the October raid, 60 were shot down (21%) and 138 damaged, adding up to a total casualty rate of 68%. Had an effective escort fighter been available during 1943, the frequency and effectiveness of those raids (and others) would have been much increased.

 

Planning For and Building Long Range Escorts

The vulnerability of daylight bombers to fighter defences was a lesson painfully learned by the RAF in the first two years of the War. As a result, Bomber Command re-directed its force to the night campaign that continued into 1945. The USAAF began its daylight campaign with the belief that the firepower of the B-17 would be sufficient defence. Even had that been true, an escort fighter would still have been beneficial. Obviously, the planning and build-up for the campaign began well before August 1942. At that time, the Spitfire was the leading Allied fighter and greater effort should have been applied to increasing its range so that it could operate deep in Europe as an escort. It was employed when targets in France were attacked so clearly the value of an escort was recognised. Supermarine faced the twin challenges of building sufficient Spitfires for the front line while also developing successor marks of greater performance. Concurrent development and manufacture in America would have substantially increased the resources available. There were precedents for such a policy. The American car company Packard produced over 55,000 of the 168,000 Merlin engines built; Canadian companies also supplemented production of the Hawker Hurricane and Avro Lancaster. There was no insurmountable obstacle to America-based Spitfire manufacture. Options might have included Curtis taking on Spitfire production in place of the distinctly average P-40 or the Spitfire replacing the P-39 Airacobra at Bell. American resources would have speeded the development of the Spitfire beyond the Mk V and could have aimed that development at stretching the range for the escort role.

Spitfire versus Merlin Mustang

Supermarine had some success during the War in extending the Spitfire’s range but it did not come close to matching the P-51. Put simply, the Mustang flew far further because it carried much more fuel and had less drag. This article will concentrate on fuel load but the drag difference is worth addressing briefly. At the same throttle setting, a Merlin Mustang would fly 30 mph faster than a Merlin Spitfire of equal power. The P-51 gained significant thrust from the air passing through its radiator such that its net coolant drag was only one sixth that of the Spitfire. (See Lee Atwood’s article in Aeroplane May 99). Building this system into the Spitfire would have resulted in effectively a new aircraft but increasing the fuel load was certainly feasible. Incidentally, Supermarine produced a design proposal involving moving the radiators from under the wings to the fuselage underside just aft of the cockpit; clearly the Mustang had been an object lesson. A company report in December 1942 claimed a 30 mph speed increase would accrue from that and certain other modifications but the scheme was taken no further.

The first Merlin powered Mustangs, the P-51B and C, began operations from England in late 1943. At that time, the Mk IX Spitfire led Fighter Command’s order of battle. Both aircraft had 60-series Merlins of similar power output but their performance differed markedly (see table 3).

	P-51C	Spitfire IX (%age of P-51C value)
Engine / Power hp	V-1650-7    1,450 hp at take-off War emergency 1,390 hp at 24,000 ft	Merlin 61   1,565 hp at take-off  (108%) War emergency 1,340 hp at 23,500 ft (96%)
Empty weight lb	6,985	5,800 (83%)
Normal loaded lb	9,800	7,900 (81%)
Max loaded lb	11,800	9,500 (81%)
Internal fuel Imp gal	224	85 (38%)
Range on internal fuel	955 miles at 397 mph at 25,000 ft 1,300 miles at 260 mph at 10,000 ft	– 434 miles (33%) at 220 mph at ? ft  (85%)
Air miles per gallon	4.44 6.05	– 5.11 (84%)
External fuel Imp gal	180 (2 x 90 under wing drop tanks)	90 (1×90 under fuselage slipper drop tank) (50%)
Total fuel Imp gal	404	175 (43%)
Range on total fuel	2,440 miles at 249 mph	980 miles (40%) at 220 mph (88%)
Air miles per gallon	6.18	5.60 (91%)
Speed mph at ht ft	426 mph at 20,000 ft 439 mph at 25,000 ft 435 mph at 30,000 ft	396 mph at 15,000 ft (93%) 408 mph at 25,000 ft (93%)
Time to 20,000 ft	6.9 min	5.7 min (83%)
Ceiling ft	41,900	43,000 (103%)
Armament	4 x 0.5” 350 rpg i/b, 280 rpg o/b	2 x 20mm 120 rpg, 4 x 0.303” 300 rpg
Consumption is quoted in air miles per gallon (ampg) figures and is the average value for a specified case of fuel load, speed and cruising altitude. Note that both the Spitfire and Mustang were more economical when carrying drag inducing external tanks than when flying clean. This paradoxical point is explained by the fact that the longer range endowed by drop tanks resulted in the aircraft spending a greater proportion of the flight in the cruise, the most frugal phase of the sortie.

Table 3. Performance Comparison: Spitfire Mk IX versus Mustang P-51C

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Despite an empty weight half a ton greater than the Mk IX, the P-51C had a useful speed advantage. In range, there was no comparison. On internal fuel alone, the Mustang almost equalled the slipper tank fitted Spitfire’s range and did so cruising 80% faster. The Mk IX’s only win was in time to height where its lower weight was advantageous. It is worth noting that the Mk XIV Spitfire required the 2,050 hp Griffon to equal the P-51D’s speed; its range was somewhat less than the Mk IX owing to the greater thirst of its 36.7 litre powerplant.

It should be noted that range figures in many reference books are potentially misleading, as those quoted are generally the aircraft’s absolute maximum under ideal conditions. In actual operations, fuel allowances must be made for take-off, climb, head winds, combat and diversion. The effect is to reduce the realistic operational radius of action to under half the maximum range. Note that the P-51C needed drop tanks to reach Berlin with enough fuel remaining for combat and return to base whereas its absolute range figure suggests it could fly a double round trip.

 

In his book Spitfire: A Test Pilot’s Story, Supermarine chief test pilot Jeffrey Quill describes an experiment in range extension. A Mk IX Spitfire was fitted with a 75-gallon rear tank plus a 45-gallon drop tank (presumably a slipper) for 205 gallons total. Quill flew a non-stop return flight from Salisbury Plain in southern England to the Moray Firth in northern Scotland. Owing to poor weather, the journey was entirely made below 1,000 ft, which is not the most economical cruising altitude. Distance covered equalled the East Anglia to Berlin return sortie of the Mustang. The flying time was five hours, suggesting the standard cruising speed of 220 mph was used for the 1,100-mile trip. However, with its 68-gallon rear tank, the P-51’s internal capacity was around 224 gallons. For long-range escort missions, it carried two drop tanks of 62 or 90 gallons each giving a total load of at least 348 gallons, ie some 70% more fuel than Quill’s experimental Mk IX. We must conclude that on 205 gallons, the Mk IX would have had little or nothing in reserve for combat when 550 miles from home. (Note that cruising at 20,000 ft would have reduced fuel consumption by 10% or more).

Spitfire fighters achieved similar distances to the Berlin mission during the War but only on ferry sorties. Mk Vs were flown from Gibraltar to Malta, a distance of 1,100 miles, ie equal to the England-Berlin round trip. A total of 284 gallons was carried: 85 gallons in the standard fuselage tanks, a 29-gallon rear fuselage tank plus a 170-gallon drop tank. The route was first flown in October 42 and the aircraft landed after 5¼ hours (210 mph ground speed, there was a slight tail wind) with 40 gallons remaining. The drop tank was not jettisoned and the average consumption was 4.51 ground miles per gallon, ie a maximum range of 1,278 miles in those conditions. A&AEE estimated the range of the Mk V with both the 29-gallon and ferry tank to be 1,624 miles assuming tank jettison (5.72 ampg); the range gain of 27% emphasises the drag of the big slipper tank. Achieving escort fighter range with the Spitfire was clearly possible but the bulky 170-gallon tank was not the answer.

As an aside, in their comprehensive tome Spitfire, The History, Morgan and Shacklady include a diagram of Mk V Spitfire range as an escort with the 90-gallon slipper tank. A 540 mile radius of action is claimed at a 240 mph cruise with 15 minutes allowed for take-off and climb plus 15 minutes at maximum power (ie combat). Starting from south-east England, such a radius takes in not only Berlin but also Prague and Milan. Maximum range with the 90-gallon external tank and 85 gallons of internal fuel is generally quoted as 1,135 miles with no allowance stated for combat and so forth. No Spitfire flew deep escort missions and this makes the claim for the Mk V having Berlin capability somewhat questionable.

As already stated, reducing the Spitfire’s drag to the Mustang’s level was not feasible in a realistic timescale but there was definitely potential to increase its fuel load. Here, the escort potential of the Mk IX will be assessed. The Mk IX entered service in July 1942 and was essentially a Mk V modified to take the two stage, two speed supercharged Merlin 60 series. It was rushed into production to counter the Focke Wulf Fw 190A-1 that had, since its appearance in July 1941, proved markedly superior to the Mk V Spitfire. The plan had been for the Merlin 60 to first appear in the Mk VIII, which was a more highly developed design with, inter alia, revised ailerons, a retractable tailwheel and leading edge fuel tanks. In the event, the loss of air superiority to the Fw-190 forced the stopgap Mk IX into being and, as is well known, it proved highly successful. Hence the Mk IX preceded the Mk VIII into service by 11 months.

Developing the Mk IX Escort

Beginning life with the standard 85 gallons of internal fuel, the Mk IX also used slipper drop tanks of 30, 45 or 90 gallons on combat sorties. Late production Mk IXs gained the 75 gallons of the rear fuselage tanks taking total internal fuel load to 160 gallons or 71% of the P-51’s capacity. Add the 90-gallon slipper tank and total fuel rises to 250 gallons. With 175 gallons (85 + 90), the Mk IX’s range was 980 miles at 220 mph. A total of 250 gallons is an increase of 43% but an equal increase in range should not be assumed without some thought. The added weight of the rear tanks and fuel (around 640 lb, an extra 7% in take-off weight) would slow the climb to altitude and increase the lift-induced drag. That would be balanced by the extra fuel extending the sortie time fraction spent in the cruise. A&AEE estimated the maximum range of the Mk IX with the 170-gallon ferry tank to be 1,370 miles (85 + 170 = 255 gallons, 5.37 ampg). As the 170-gallon tank was a high drag installation (some four times ‘draggier’ than the 90-gallon version, see Table 2) it is reasonable to allow our Mk IX its 43% range increase, ie 1,401 miles. This is confirmed by a Supermarine trial of the 85 + 75 + 90 gallon fuel load case that achieved ‘around 1,400 miles’. Thus the escort Mk IX would achieve 56% of the Mustang’s 2,440-mile range yet required 62% of the Mustang’s 404 gallons total load. This demonstrates the P-51’s low drag advantage, enabling it to fly 10 miles for every 9 flown by the Spitfire despite cruising almost 30 mph faster.

In addition to the above case described by Quill, the Mk IX was also the subject of a range extension experiment in America. At Wright Field, two Mk IXs were fitted with a 43-gallon tank in the rear fuselage, 16.5 gallon flexible tanks in each leading edge and a Mustang 62-gallon drop tank under each wing. Total internal capacity: 161 gallons; total fuel load: 285 gallons (oil capacity was also increased to 20 gallons). A still air range of approximately 1,600 miles was achieved. According to Quill, certain of the American structural modifications adversely affected aircraft strength so ruling out this scheme for production. What was the problem? Given that the Mk VIII and later marks had leading edge bag tanks as standard, any problem with that particular Wright Field modification could surely have been resolved. The Mk IX was cleared to carry a 250 lb bomb on the underwing station whereas a full 62-gallon tank weighed around 550 lb. Clearance of that tank should still have been possible albeit with a lower g-limit than when the bomb was carried. 

Where else could internal fuel have been installed? The rear fuselage tanks hardly filled the space available but adding additional weight there would have moved the centre of gravity unacceptably far aft. Late production Mk IXs featured an 18-gallon Mareng bag tank in each wing although it is not clear how widely these wing tanks were fitted and used. There was also provision for 14.4 gallons of oil for long-range sorties in place of the standard 7.5 gallons. With rear fuselage and wing tanks, internal fuel capacity would have been 196 gallons, giving an estimated range of 1,002 miles. Add the PR Mk VI 20-gallon under-seat tank and the figures would have been 216 gallons and 1,210 miles. The 90-gallon slipper tank would take total fuel load to 306 gallons and range to 1,714 miles (70% of the P-51).

Could any more fuel have been carried in the wing? Maximum wing fuel was achieved in the photo-reconnaissance versions where the deletion of the armament allowed unfettered use of the leading edge. The fighters used flexible bag tanks but in the PR versions, the leading edge structure between ribs 4 and 21 was converted into an integral tank carrying 66 gallons per side. Late production Mk IXs had an armament of 2 x 20 mm Hispanos and 2 x 0.5” Brownings. The latter was fitted between ribs 8 and 9 with the cannon between 9 and 10. Could the integral tank been made in two sections, joined by pipework and with the armament in between? Such a tank would have comprised 15 bays compared to the 17 of the PR case. Assuming a volume of 80% of the full span PR tank, the fighter version would have held 53 gallons per wing, taking internal fuel to 286 gallons.

Table 4 presents actual measured and estimated ranges for various fuel loads. For the measured cases, the range achieved  is divided by the fuel capacity to give the average ampg. For each estimate, an appropriate ampg figure is multiplied by the fuel load to give the range. This method is somewhat crude but offers an idea of the Mk IX’s potential.

	Internal Main + rear + wings (total) (gal)	External (gal)	Total (gal)	Range (miles)	Air miles per gal	Comment
a	85 + 0 + 0                  (85)	0	0	434	5.11	Internal fuel, early versions
b	85 + 0 + 0                  (85)	90	175	980	5.60	As above plus 90-gal slipper tank
c	85 + 75 + 0              (160)	0	160	896	5.60	Internal fuel, later versions
d	85 + 75 + 0              (160)	90	250	1,400	5.60	As above plus 90-gal slipper tank
e	85 + 75 + 0              (160)	90 +2×62	374	2,020	5.40	As above plus 2 x 62-gal u/w tanks
f	85 + 43 + 33            (161)	2 x 62	285	1,600	5.61	Wright Field trial
g	85 + 75 + 20 + 36   (216)	0	216	1,210	5.60	Max internal capacity
h	85 + 75 + 20 + 36   (216)	90	306	1,714	5.60	As above plus 90-gal slipper tank
i	85 + 75 + 20 + 36   (216)	2 x 62	340	1,904	5.60	Internal plus 2 x 62-gal u/w
j	85 + 75 + 20 + 36   (216)	90 +2×62	430	2,322	5.40	As above plus 90-gal slipper tank
k	85 + 75 + 20 + 106 (286)	0	286	1,602	5.60	Integral tanks 53 gal per wing
l	85 + 75 + 20 + 106 (286)	90	376	2,106	5.60	As above plus 90-gal slipper tank
m	85 + 75 + 20 + 106 (286)	2 x 62	410	2,296	5.60	Internal plus 2 x 62 gal u/w
n	85 + 75 + 20 + 106 (286)	90 +2×62	500	2,700	5.40	As above plus 90-gal slipper tank
o	85 +29 + 0               (114)	170	284	1,278	4.50	Mk V in ferry fit. 170-gal slipper tank not jettisoned.

Table 4.  Spitfire Mk IX Fuel Load and Range Estimates

Note: Range and air miles per gallon (ampg) figures in normal font are from actual trials measurements.

Range and ampg figures in italics are estimates for the proposed fuel load cases.

On internal fuel alone of 216 gallons (g), the Mk IX might have reached 1,210 miles or almost three times the range on its original internal load of 85 gallons. This figure also bears comparison with the Mustang’s 1,300 miles on 224 internal gallons – albeit with the Mustang cruising at 260 mph to the Spitfire’s 220 mph (see Table 3).  Adding the three external tanks (90 + 2 x 62) (j) takes the projected Mk IX beyond 2,300 miles and into the region where an escort mission to Berlin might have been possible. On internal fuel of 286 gallons (k), the Mk IX’s range would have been in the order of 1,600 miles rising to around 2,300 with the two 62-gallon drop tanks and 2,700 miles when the 90-gallon slipper was added as well. On this basis, Berlin was certainly within its radius of action.

Before a judgement is made, we must consider whether the Spitfire could have carried such a weight of fuel. Table 5 compiles the weight of a Mk IX with 216 gallons internal plus the three external tanks holding 214 gallons. At 9,856 lb it is some 4% above the 9,500 lb maximum take-off weight. Fitting the 45-gallon slipper tank in place of the 90-gallon version would have reduced total weight to 9,502 lb, fuel load to 385 gallons and range to 2,079 miles. However, the risk of the weight exceedance might have been considered worthwhile in return for the range benefit. The Wright Field modified Mk IX weighed 10,150 lb and the undercarriage was fully compressed under this load. In the 286 internal gallons case Mk IX, no allowance has been made for the weight of the integral tanks. Even so, total weight with the three external tanks is 10,467 lb or 10% above MTOW; such a load would probably have required the strengthened structure of the Mk VIII.

	Internal 85 + 75 + 20 + 36 (216)			Internal 85 + 75 + 20 + 106 (286)
	Empty	5,800		Empty 1	5,850
	240 rd 20mm	150		240 rd 20mm	150
	1,400 rd 0.303”	93		500 rd 0.50”	150
	14.4 gal oil	131		14.4 gal oil	131
	Pilot & kit	200		Pilot & kit	200
	75-gal rear tank (estimated)	100		75-gal rear tank (estimated)	100
	Basic weight	6,474		Basic weight	6,581
	Internal fuel 216 gal	1,555		Internal fuel 286 gal	2,059
	90-gal slipper	120		90-gal slipper	120
	2 x 62-gal	166		2 x 62-gal	166
	External fuel 214 gal	1,541		External fuel 214 gal	1,541
	Total fuel weight	3,096		Total fuel weight	3,600
	Total weight	9,856		Total weight	10,467

Note 1. Two 0.50” Brownings increase empty by 50 lb compared to four 0.303” Brownings

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Table 5. Spitfire Mk IX: Estimated Weight in Escort Role Configurations

Fuel Management and Centre of Gravity

Careful fuel management would have been important. The rear fuselage fuel moved the centre of gravity sufficiently far aft to make the Spitfire longitudinally unstable. As a result, the aircraft could not be trimmed, so tended to diverge in pitch and tighten into turns. These characteristics were certainly undesirable (the latter was unacceptable in combat) but could be tolerated in the early stages of a sortie, ie climb to height and the first part of the outbound cruise leg. A&AEE tests showed that when 35 gallons of the rear fuel had been consumed, longitudinal stability was regained. Conversely, additional leading edge fuel would have caused little problem, as it was far closer to the centre of gravity so causing only small changes in trim as it was consumed. The sequence of fuel use in an escort sortie might have followed this pattern:

Start-up, taxi and take-off with rear tank selected

Climb to height and cruise commenced on remaining rear tank fuel

Outbound cruise continued on underwing tanks fuel – jettisoned when empty (or on entering combat)

Combat on slipper tank fuel

Return on internal fuel

Conclusion

There was surely no insuperable obstacle to developing a long range escort version of the Spitfire. Wing tanks and rear fuselage tanks were used successfully albeit later in the war than was ideal. The use of the leading edge as an integral tank was also successful in the PR Spitfires and a two section version was surely not impossible. All the above options could have been applied to the Mk IX’s successors, in particular the Mk VIII and the Mk XIV, the leading RAF fighters in the final year of the war. The Griffon powered Mk XIV was an outstanding fighter and would have been a formidable escort over Germany. The Mk VIII served in the Far East, a theatre of operations where long range was invaluable.

There are some other issues worth considering. Good all round vision is essential in a fighter and late examples of the Mk XVI (essentially a Mk IX with a Packard-built  Merlin) and XIV were the first Spitfires to feature cut down rear fuselages with bubble canopies. Jeffrey Quill recommended this change following operational experience in the Battle of Britain; the modification took 4 years to reach the front line. Slimming the rear fuselage naturally reduced its volume and rear tank capacity went down to 66 gallons. In this case, the small reduction in range was a small price to pay for the visibility gain in the vulnerable ‘six o’clock’. That loss of 9 gallons could have been balanced by fitting the Mk IX with the main lower tank of the Mk VIII that held 48 to the Mk IX’s 37 gallons. The greater strength of the Mk VIII should also have borne a greater fuel load. The torpedo drop tanks were of significantly lower drag than the slipper variety. For example, the 170-gallon torpedo actually had lower drag than the 90-gallon slipper and only one quarter that of its slipper equivalent (see Table 2). An underfuselage torpedo tank of 120 gallons capacity would have had less drag than the 90-gallon slipper yet offered a useful increase in range.

We must remember that there is a gulf between having a ‘bright idea’ and bringing a fully developed modification into service. Supermarine engineers achieved near miracles in both stretching the Spitfire to be a world class fighter from its 1936 prototype to the dawn of the jet age and in building sufficient numbers to help win victory. Additional design resources would have stretched the Spitfire further and added the role of long range escort to its many accomplishments. Parallel development and manufacture of the Spitfire in America would have achieved this and offered the prospect of RAF Spitfires flying escort missions over Germany in 1943 alongside Spitfires of the USAAF.

Paul Stoddart served as an engineer officer in the Royal Air Force for eight years. He now works for the Defence Evaluation & Research Agency (DERA). This article is his personal view on the subject and does not necessarily reflect RAF, Ministry of Defence or DERA policy.

Internal fuel load (Imp gal) – Spitfire Fighters

Mark

Forward fuselage

(ie main tanks)

Leading edges

Rear fuselage

Total internal

Comment

I, II

48 + 37

0

0

85

V

48 + 37

0

0

(29)

85

Slipper drop tanks carried on Mk V and later marks.

29-gal rear fuselage tank used only with 170-gal ferry slipper tank.

IX, XVI

48 + 37

0

0

0

2 x 18

0

42 + 33

33 + 33

42 + 33

85

160

151

196

Early examples

Late examples

Cut down rear fuselage

Some late examples

VIII

48 + 48

2 x 13

0

122

Served outside NW European theatre

Griffon Spitfires

XII

36 + 37

36 + 48

0

0

73

84

Oil tank re-positioned to upper tank bay.

XIV

36 + 48

2 x 13

0

42 + 33

110

185

Stability problems with rear tank

XVIII

36 + 48

2 x 13

33 + 33

176

Rear tank cleared post WWII

21, 22

36 + 48

2 x 17

0

118

Very limited wartime use 21 only

24

36 + 48

2 x 17

33 + 33

184

No wartime use