The R31 class of British rigid airships was constructed in the closing months of World War I and comprised two aircraft, His Majesty’s Airship R31 and R32. They were designed by the Royal Corps of Naval Constructors – with assistance from a Herr Müller who had defected to Britain and previously worked for the Schütte-Lanz airship company – and built by Short Brothers at the Cardington airship sheds. The airship frame was made from spruce plywood laminated into girder sections, weatherproofed with varnish, and also fireproofed. These enclosed 21 gas bags. R31 was the largest British airship to fly before the end of the war, and the class remains the largest mobile wooden structures ever built.
As the airships were intended for fleet protection operations, they were to be fitted with defensive machine guns on top of the envelope, at the stern and in the gondolas. A 12-pounder gun was to be fitted in a special position centrally below the airship for use against U-boats. In the event, this armament was only fitted to R31, as R32 was only completed after the armistice with Germany. It had also been intended to fit a bomb load of two 520 lb (240 kg) bombs and four 230 lb (100 kg) bombs. but with the end of hostilities these were never installed on either airship.
R31 made its first trial flight, lasting two hours, in July 1918 under the command of Squadron Leader W.C. Hinks. A top speed of 70 mph (110 km/h) was achieved, well above the expected 50–55 mph (80–89 km/h) and faster than any other airship then in service. It was originally powered by six 275 hp (205 kW) Rolls-Royce Eagle engines, but in view of the performance and to reduce fuel consumption one was removed, reducing the maximum speed to a still satisfactory 65 mph (105 km/h); similarly the R32 was built with six engines and later converted to a five-engine configuration.
The airship was finally commissioned on 6 November 1918, just before the armistice with Germany, after having spent four hours in the air. It set off, again under the command of Squadron Leader Hincks, for the airship base at East Fortune in Scotland. On the journey she encountered bad weather and it was feared that some of the plywood girders were failing, so she diverted to the airship base at Howden in the East Riding of Yorkshire for examination and repair. Unfortunately, the sheds had not been repaired since the R27 had caught fire three months earlier and the roof leaked badly. This caused the glue holding the plywood together to deteriorate; as a result the airship became unairworthy and was beyond repair. In February 1919 it was dismantled. The covering was removed and returned to Cardington while the frames were sold for £200; these were broken up and sold for firewood but due to the fireproofing treatment they had received they would not burn.
R31
After being formally accepted by the Royal Navy, R32 made its first trial flight on 3 September 1919 and then on 6 September went to RNAS Pulham, Norfolk, which at the time was a centre for training and experimentation. On 10 September in formation with the R33 she made a flight over the Netherlands, Belgium and Northern France and back to Pulham. In October 1919 the R32 with the rest of the airship fleet was formally handed over to the Royal Air Force. The ship was flown from Cardington on September 16th 1919 with Major Elmsley in charge. George Meager reports that a week later he was on board as navigator when the R32 flew across to Amsterdam – he recalls another crew member named Scroggs on this flight. He took a further two flights a month later naming Flt Lt Ivor Cecil Little as the Captain and Scroggs as First Officer. The airship was used by the National Physical Laboratory for structural testing. On 20 March 1920 it was flown to Howden to be refurbished and used for crew training by the American party who had come to accept the R38 (ZR-2). When the metal-framed R80 became available, the use of the by now obsolete wooden-framed R32 stopped and, to save money, it was decommissioned and used to assess the effect of a gas-bag bursting. Once the covering had been removed and the engines taken away, cell No.18 was overpressurised until the expansion caused the bracing and structure to fail. The frame was subsequently dismantled.
The R32 leaving the shed at Cardington.
Powerplant: 5 × Rolls-Royce Eagle, 275 hp (205 kW) each Volume: 1,547,000 cu ft (43,976 m3) Length: 615 ft 0 in (187.5 m) Diameter: 65 ft 6 in (19.97 m) Useful lift: 36,960 lb (16,800 kg) Maximum speed: 65 mph (104 km/h, 56 kn)
The original version of the S.41 was converted to a landplane and flown by Cdr R. Samson – also the pilot of its maiden flight – during the Army manoeuvres of September 1912. Built at Eastchurch, Isle of Sheppey.
With its floats restored, it started flying from the temporary seaplane station at Carlingnose on October 2nd 1912. In January 1913 it underwent an overhaul during which the centre section gap was covered.
In September 1913 it was overhauled again and the aircraft emerged completely different in shape, fitted with folding wings of greater span and a new rudder. In 1914 it was refitted with a 140 hp Gnôme and assigned to the Eastchurch flying school. In 1915 the S.41 was sent to the Aegean theatre and in 1916 was spotted at Inbros.
It was not included in the March 1916 list of naval aircraft and may have been destroyed prior to that month.
Engine: 100 hp Gnome Max speed: 60 mph Endurance: 5 hr
The 360 is a growth development of the 330 with more power, and a three foot stretch ahead of the wing and a redesigned rear fuselage and tail surfaces. An extra six seats (in two rows) were accommodated by stretching the cabin and deleting the 330’s rear loading ramp, and the tail arrangement was changed to a conventional single fin.
The prototype 360 flew on 1 June 1981 and the type entered service in December 1982. First introduced with Pratt & Whitney Canada PT6A-45R engines, the Shorts 360-300 version has 1,424 shp (1062 kW) PT6A-67R turboprops with six-bladed propellers and other refinements to produce about 18 per cent more thrust at take-off.
164 examples were sold up until 1991.
SD3.60 Engines: 2 x P&W PT6-65AR, 1403 shp Props: Hartzell 5-blade, 111-in Seats: 36 Length: 70.9 ft Height: 23.7 ft Wingspan: 74.7 ft Wing area: 453 sq.ft Wing aspect ratio: 12.3 Maximum ramp weight: 25,800 lb Maximum takeoff weight: 25,700 lb Standard empty weight: 16,600 lb Maximum useful load: 9200 lb Maximum landing weight: 25,400 lb Wing loading: 56.7 lbs/sq.ft Power loading: 9.7 lbs/hp Maximum usable fuel: 3840 lb Best rate of climb: 1010 fpm Service ceiling: 20,000 ft Maximum speed: 211 kt Normal cruise @ 7,000ft: 160 kt Fuel flow @ normal cruise: 975 pph Endurance at normal cruise: 3.4 hr Stalling speed clean: 94 kt Stalling speed gear/flaps down: 78 kt Turbulent-air penetration speed: 158 kt
Short 360-300 Engines: 2 x Pratt & Whitney PT6A-67R turboprops, 1062kW / 1,424 shp Prop: 6 blade Max take-off weight: 12290 kg / 27095 lb Wingspan: 22.8 m / 75 ft 10 in Length: 21.58 m / 71 ft 10 in Height: 7.27 m / 24 ft 10 in Wing area: 42.18 sq.m / 454.02 sq ft Cruise speed: 400 km/h / 249 mph Range w/max.payload: 745 km / 463 miles
This Shorts 330-200 overran into the Caribbean sea after aborting takeoff on May 6, 1993. All of the passengers on the plane, which was taking off from what was then known as Beef Island Airport in the British Virgin Islands, were unharmed, but the plane was a lost cause.
The prototype of the Shorts SD3-30 30-passenger unpressurized commuter airliner; later redesignated Shorts 330, was derived from the smaller Skyvan, with a fuselage stretched to accommodate 30 passengers while retaining the Skyvan’s twin tail fin, but including a semi-retractable undercarriage.
The Short SD3-30 prototype (G-BSBH), a 30-passenger airliner powered by twin turboprop engines, was flown for the first time at Belfast, Northern Ireland on 22 August 1974, and the first entered service with the Canadian airline Time Air on 24 August 1976, although the first order had been placed by Command Airways of Pouglikeepsie, New York.
Versions available included the standard 330-200, the Sherpa civil freighter, and the 330-UTT utility tactical transport.
The USAF operated 18 twin-turboprop Sherpa/330-UTT from Zweibrucken in West Germany, providing a distribution service for high-priority spares in Europe. Designated C-23A, the aircraft were ordered in March 1984 to fulfil the European Distribution System Aircraft (EDSA) requirement. Two Sherpas were delivered in November 1984, and the remaining 16 by the end of 1985.
The C-23A is a freighter version of the Shorts 330-200, retaining many features of the civilian model including the forward freight door. An hydraulically operated rear cargo door/ramp is incorporated in the Sherpa, thus allowing through loading. Up to seven C08 or four LD3 cargo containers or two half-ton vehicles can be accommodated, and utility passenger operations may also be undertaken. The C-23A first flew on August 6, 1984, and is powered by two 893kW Pratt & Whitney Canada PYT6A-45R turboprops.
Designated C-23B, the first of 10 Shorts Super Sherpas for the US Army National Guard made its first flight in 1990. The aircraft are similar to the 18 C-23A Sherpas used by the US Air Force, but have more powerful Pratt & Whitney Canada PT6A-65AR turboprops, strengthened wings, five-bladed propellers and air-operable rear freight doors for supply dropping.
Lacking the rear loading ramp of the Sherpa, the Shorts 330-UTT (Utility Tactical Trans¬port) can carry a maximum payload of 3,630kg. Typical loads include 33 troops, 30 paratroops, or 15 stretchers. Range with 30 fully armed troops is greater than 1,100km. Two inward opening rear side doors are provided for para¬dropping. Customers for the 330-UTT include the Royal Thai Army and Royal Thai Police.
Nearly 100 had been delivered by 1990, and a total of 141 Short 330s were built before production ended in 1992.
SD3-30 Engines: 2 x P&WAC PT6A-45, 1120 hp Seats: 33 Wing loading: 48.6 lb/sq.ft Pwr loading: 9.8 lb/hp Max TO wt: 22,000 lb Operating wt: 14,230 lb Equipped useful load: 7770 lb Payload max fuel: 3930 lb Range max fuel/cruise: 690 nm/3.5 hr Range max fuel / range: 785 nm/ 5.5 hr Service ceiling: 18,500 ft Max cruise: 190 kt Max range cruise: 144 kt Vmc: 77 kt Stall: 73-89 kt 1.3 Vso: 95 kt ROC: 1130 fpm SE ROC: 210 fpm @ 101 kt SE Service ceiling: 9500 ft Min field length: 3650 ft Fuel cap: 3840 lb
SD3.30 Engines: 2 x P&W PT6A-45A, 1156 shp Props: Hartzell 5-blade, 111-in Seats: 30 Length: 58 ft Height: 16.2 ft Wingspan: 78.6 ft Wing area: 453 sq.ft Wing aspect ratio: 12.3 Maximum ramp weight: 22,500 lb Maximum takeoff weight: 22,400 lb Standard empty weight: 14,700 lb Maximum useful load: 7800 lb Zero-fuel weight: 21,140 lb Maximum landing weight: 22,100 lb Wing loading: 49.5 lbs/sq.ft Power loading: 9.7 lbs/hp Maximum usable fuel: 3840 lb Best rate of climb: 1070 fpm Certificated ceiling: 19,000 ft Maximum single-engine rate of climb: 210 fpm @ 105 kt Single-engine climb gradient: 120 ft/nm Single-engine ceiling: 6750 ft Maximum speed: 204 kt Normal cruise @ 10,000ft: 197 kt Fuel flow @ normal cruise: 890 pph Endurance at normal cruise: 3.9 hr Stalling speed clean: 89 kt Stalling speed gear/flaps down: 74 kt Turbulent-air penetration speed: 157 kt
330/UTT Engine: 2 x P&WAC PT6A turboprop Installed pwr: 1785 kW Span: 22.8 m Length: 17.7 m Wing area: 42.1 sq.m Empty wt: 6445 kg MTOW: 11,160 kg Payload: 3630 kg Cruise speed: 372 kph Initial ROC: 360 m / min Ceiling: 6100 m T/O run: 415 m Ldg run: 235 m Fuel internal: 2546 lt Range/payload: 1390 km with 2330 kg Capacity: 33 pax
C-23A Sherpa Engine: 2 x P&WAC PT6A Installed pwr: 1785 kW Span: 22.8 m Length: 17.7 m Wing area: 42.1 sq.m MTOW: 10,390 kg Payload: 3175 kg Cruise speed: 350 kph Initial ROC: 360 m / min Ceiling: 6100 m T/O run (to 15m): 1036 m Ldg run (from 15m): 1225 m Fuel internal: 2032 lt Range/payload: 1240 km with 2270 kg Capacity: 33 pax
C-23A Engines: 2 x Pratt Whitney PT6A-45R turboprops, 900kW Max take-off weight: 10390 kg / 22906 lb Loaded weight: 6680 kg / 14727 lb Payload: 3175kg / 7000 lb Wingspan: 22.76 m / 75 ft 8 in Length: 17.69 m / 58 ft 0 in Height: 4.95 m / 16 ft 3 in Wing area: 42.1 sq.m / 453.16 sq ft Cruise speed: 352 km/h / 219 mph Ceiling: 6000 m / 19700 ft Range w/max.payload: 370-1240 km / 230 – 771 miles Crew: 3
The Skyvan had its origins in the Miles Aerovan, the concept of which was taken on by Short in a radically overhauled design. It was designed to carry an 11 ton payload over 200 miles at 160 m.p.h, with an all up weight of 8,600 lb.
Two prototypes were built at Belfast during 1960 with two 390 bhp Continental GTS IO 520s. It was decided that turboprop power was required, so the prototype and early production (Series 2) examples were ultimately fitted with Astazou II turboprops.
The Short Skyvan (G ASCN), re engined with Turbomeca Astazou turboprops, flew for the first time with its new power plants on October 2, 1963. With Dennis Taylor at the controls the Skyvan was in the air for twenty five minutes on its first flight.
These engines were not ideal for hot-and-high conditions or American customers, so the Series 3 was upgraded to the specified Garrett type.
The Skyliner was a dedicated passenger-carrying version.
The military version of the twin-turboprop Skyvan is the Skyvan 3M-200, which is cleared to an increased maximum take-off weight of 6,804kg for military operations. Powered by two 533kW Garrett TPE331 engines, the prototype Skyvan 3M first flew early in 1970. Troop transport, paradropping, assault transport, SAR, and medevac are among the capabilities of the Skyvan. The Skyvans of the Sultan of Oman’s Air Force have Racal ASR 360 airborne surveillance radars for maritime patrol and SAR duties.
The sole example of the Skyvan sold to the Sharjah Amiri Air Wing was delivered in 1986. It was also the last Skyvan built.
In all, 149 Skyvans were built and sold to commercial freight/passenger ‘bush’ operators and military/paramilitary operators up until 1986.
SC-7 Engines: 2 x Garrett TPE 331-2-201A, 715 shp / 533kW Props: Hartzell 3-blade, 102-in Seats: 19 Length: 40 ft Height: 15 ft Wingspan: 64.8 ft Wing area: 373 sq.ft Wing aspect ratio: 11 Maximum ramp weight: 12,500 lb Maximum takeoff weight: 12,500 lb Standard empty weight: 7100 lb Maximum useful load: 5400 lb Equipped useful load: 3900 lb Maximum landing weight: 12,500 lb Wing loading: 33.5 lbs/sq.ft Power loading: 8.7 lbs/hp Fuel cap: 2320/3105 lb Payload max fuel: 795 lb Range max fuel/cruise: 770nm/4.5hr Range max fuel /range: 849nm/5.9hr Best rate of climb: 1640 fpm Service ceiling: 22,100 ft Maximum single-engine rate of climb: 450 fpm @ 92 kt Single-engine ceiling: 12,500 ft Maximum speed: 176 kt Normal cruise @ 10,000ft: 169 kt Fuel flow @ normal cruise: 482 pph Endurance at normal cruise: 6 hr Max range cruise: 145 kt Vmc: 67 kt Stalling speed clean: 74 kt Stalling speed gear/flaps down: 55 kt Turbulent-air penetration speed: 140 kt Min field length: 1580 ft 1.3 Vso: 78 kt
Skyvan Series 3 Engines: 2 x Garrett TPE331-201 turbo-prop, Max take-off weight: 5670 kg / 12500 lb Empty weight: 3500 kg / 7716 lb Wingspan: 19.79 m / 65 ft 11 in Length: 12.22 m / 40 ft 1 in Height: 4.6 m / 15 ft 1 in Wing area: 34.65 sq.m / 372.97 sq ft Cruise speed: 325 km/h / 202 mph Ceiling: 6860 m / 22500 ft Range w/max.fuel: 1117 km / 694 miles Range w/max.payload: 450 km / 280 miles Crew: 2 Passengers: 19
Skyvan 3M-200 Engine: 2 x Garrett TPE331 Installed pwr: 1060 kW Span: 19.8 m Length: 12.2 m Wing area: 35.1 sq.m Empty wt: 3768 kg MTOW: 6800 kg Payload: 2360 kg Cruise speed: 308 kph Initial ROC: 470 m / min Ceiling: 6700 m T/O run: 290 m Ldg run: 210 m Fuel internal: 1330 (+440) lt Range/payload: 1075 km with 4000 kg Capacity: 20 pax