Avro 618 Ten, 619 Five, 624 Six and 642

Licence built version of the Fokker F.VII/3m cantilever high-wing monoplane airliner. The fuselage was a structure of welded steel tube construction, with bracing either diagonal struts welded to the longerons, or wire bracing looped through steel tube quadrants welded into the struts. The wing was of all-wood construction, built in one piece, with boxed ply-wood spars, ply and spruce ribs and ply-wood covering. A wide-track undercarriage was fitted, consisting on each side of a radius rod, a bent axle, and the telescopic leg, attached outboard engine bearer. Side-by-side seating was provided for the pilot and engineer/navigator, and dual controls were fitted. Three baggage compartments were available, with a total capacity of 114 cu.ft, and light luggage could be put in the racks under the roof of the saloon. The designation 'Ten' was adopted as the aircraft was capable of carrying two crew and eight passengers. Three 240 h.p. Armstrong Siddeley Lynx IVB powerplant, one in the nose of the fuselage and two outboard under the wing, from which they were supported on three bolts from, the main wing spars.

Type 618 Ten Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
71 ft 3 in	47 ft 6 in	12 ft 9 in	772 sq ft	6020 lb	10600 lb	100 mph/ 87 kn	115 mph/ 100 kn	400 mi	16000 ft
21.72 m	14.48 m	3.89 m	71.72 m2	2731 kg	4808 kg	161 km/h	185 km/h	644 km	4877 m

Three-engined, five seat cantilever high-wing cabin monoplane airliner, resembling a scaled down version of the Type 618 and using the same constructional methods, with accommodation for pilot and four passengers, with room for an occasional fifth passenger when desired. The pilot was situated in a completely enclosed compartment forward of the leading edge of the wing, with entrance to the cockpit through a door in the front wall of the passengers' cabin. The latter had comfortable seating accommodation for four or five passengers. When used as a four-passenger machine, the rear part of the cabin was partitioned off and used as a lavatory.. The passengers were provided with ventilation, heating and lighting.Three 105 h.p. Armstrong Siddeley Genet Major powerplants, one mounted in the nose of the fuselage and the other two in streamline nacelles under the wing. The fuel tanks were housed in the wing, giving direct gravity feed to all three engines.

Type 619 Five Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
47 ft	35 ft 9 in	9 ft 6 in	333 sq ft	3062 lb	4620 lb	98 mph/ 85 kn	118 mph/ 103 kn	400 mi	15000 ft
14.33 m	10.9 m	2.9 m	30.94 m2	1389 kg	2096 kg	158 km/h	190 km/h	644 km	4572 m

A slightly enlarged version of the Avro Five. Constructionally similar, but the cabin was larger and, although the machine was furnished for four passengers only, the lavatory at the back was a standard feature, while in the pilot's cockpit forward of the cabin there was room for a second pilot or an extra passenger. The arrangement of the engines was also different from that of the Avro Five in that the engine nacelles were placed close under the wing. Three 105 h.p. Armstrong Siddeley Genet Major powerplants.

Type 624 Six Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
51 ft	36 ft	9 ft 6 in	360 sq ft	3058 lb	5000 lb	95 mph/ 83 kn	113 mph/ 98 kn	400 mi	14000 ft
15.54 m	10.97 m	2.9 m	33.45 m2	1387 kg	2268 kg	153 km/h	182 km/h	644 km	4267 m

A two crew, 16 passenger airliner, it featured a modified Type 618 wing moved to the shoulder position, the boxed plywood and spruce spars being continuous from tip to tip. The ribs were also built up of plywood and spruce and, from the rear spar forward the wing is completely plywood covered with fabric glued over it. Aft of the rear spar the wing is made to be detachable for ease of transportation of the large wing, and is fabric covered. The Frise-type balanced ailerons were long and had a narrow chord and, like the wing, constructed of spruce with a plywood leading edge and fabric covered. All the tail unit surfaces were of welded steel tube construction with doped fabric covering. The elevators had inset horn balances, while the rudder featured a trimming tab.
The wing was mounted on an all new, larger fabric-covered welded steel fuselage. The floor of the cabin was particularly rigid and strong and replaced the diagonal bracing, in a horizontal plane, of the bottom of the fuselage. Each section was built up of spruce and. The walls of the cabin were lined with soundproofing material and panelled with plywood, while the outside of the cabin was fabric covered. The pilots' cockpit was a separate unit of wooden construction bolted to the front of the fuselage. Initially the Type 642 was fitted with a glazed semicircular nose for the pilots compartment and Type 618-style rectangular passenfer compartment windows, but these were replaced with a conventional stepped nose and oval cabin windows that could be used as emergency exits.Each main undercarriage unit was a separate unit consisting of an axle hinged to the bottom longeron, a shock-absorbing strut carried up to wing, taking landing loads through an oleo cylinder and the taxying loads through a system of spiral steel springs, and a forward-rakedradius rod. Two 450 h.p. Armstrong Siddeley Jaguar VID powerplants were mounted on the leading edge of the wing, later replaced with two 527 h.p. Armstrong Siddeley Panther VII powerplants.

Type 642/2m Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
71 ft 3 in	54 ft 6 in	11 ft 6 in	728 sq ft	7360 lb	11800 lb	125 mph/ 109 kn	156 mph/ 136 kn	600 mi	17500 ft
21.72 m	16.61 m	3.51 m	67.63 m2	3338 kg	5352 kg	201 km/h	251 km/h	966 km	5334 m

VIP aircraft meet Specification 11/30. As the Type 642/2m with the stepped windscreen, but reverting to the Type 618 style cabin windows, the addition of a pilots entry door and a spatted undercarriage. Four wing mounted 215 h.p. Armstrong Siddeley Lynx IVC powerplants.