The SNCASE SE-3110 or Sud-Est SE-3110 was a French two seat experimental helicopter with unusual twin, angled tail rotors, first flown in 1950. After brief tests SNCASE decided to concentrate on a closely related but single-tail-rotor design.
The SE-3110 drew heavily on the design and development of the 1948 SE-3101, sharing much of the latter's control system and also its unusual twin tail rotors. Externally it was much more refined, with a rounded forward pod for occupants and engine and a slender tail boom. The two crew sat side by side behind a fully glazed nose; structurally the pod was a light monocoque. A 149 kW (200 hp) Salmson 9 Nh nine cylinder, air-cooled radial engine was mounted horizontally under a transmission box attached to the fuselage by steel tubes and driving a three-blade rotor. Some sources give the engine as a 130 kW (175 hp) Salmson 9 Nc, which was probably fitted to the first ground test article.[1] The tail rotors were mounted above the end of the boom on shafts at right angles to it and to each other, so that the rotor planes were leaning inwards at 45° to the vertical.[2] At least one image shows the drive shafts within slender fairings but several others show them bare. The SE-3110 landed on small wheels mounted on cantilever legs on each side and a long, forward-pointing, sprung skid.[2][3]
As on the SE-3101, differential pitch settings of the twin tail rotors compensated main rotor torque; there were mechanical linkages between the collective pitch, the throttle and the tail pitch control to lower the pilot's workload. Directional control was achieved by altering the tail pitch difference and the tail could be lifted or depressed, giving longitudinal control (aircraft pitch), in the same way. A new feature on the SE-3110 was longitudinal trim control via the main rotor cyclic pitch.[2]
The SE.3110 first flew on 10 June 1950, piloted by Jaques Lacarme. Gaillard states that the first prototype made only two flights at low altitude before being abandoned in favour of the SE-3120 Alouette I.[3] However, other sources say that two SE-3110s were built, appearing on the French civil register initially as F-WFUD and F-WFUE, later transferring to the B list (after gaining their Certificates of Airworthiness) as F-BFUD and F-BFUE.[4][5] In Liron's account[6] the first prototype was retained for ground durability testing but the first flight of the second prototype on 15 September 1950 rapidly ended with loss of control and a side-on crash, though Lacarme walked away. SNCASE decided the way forward lay with the single tail rotor and with main rotor blades stabilized to prevent excessive flapping, both features of the SE-3120.[7]
^Parmentier, Bruno. "SE-3110". aviafrance.com (in French). Retrieved 7 January 2015.
^ abcd"Helicopter development in France". Flight. Vol. LVII, no. 2150. 9 March 1950. pp. 310–311.
^ abcGaillard, Pierre (1990). Les Avions Francais de 1944 à 1964. Paris: Éditions EPA. p. 111. ISBN2-85120-350-9.
^"Complete (Historical) Civil Rotorcraft Register of France (part 1)". Retrieved 3 January 2015.
^"Ray Watkins collection: S.E.3110". Retrieved 4 January 2015.
^Danial Liron. "Les hélicoptères français : de la SNCASE à Eurocopter". Retrieved 3 January 2015.
^Gaillard (1990). Les Avions Francais de 1944 à 1964. p. 128.
March 16, 2024
sncase, 3110, 3110, french, seat, experimental, helicopter, with, unusual, twin, angled, tail, rotors, first, flown, 1950, after, brief, tests, sncase, decided, concentrate, closely, related, single, tail, rotor, design, 3110role, seat, helicopternational, ori. The SNCASE SE 3110 or Sud Est SE 3110 was a French two seat experimental helicopter with unusual twin angled tail rotors first flown in 1950 After brief tests SNCASE decided to concentrate on a closely related but single tail rotor design SE 3110Role Two seat helicopterNational origin FranceManufacturer SNCASE Sud Est Designer Marchetti and RenouxFirst flight 10 June 1950Number built 1 or 2Design and development editThe SE 3110 drew heavily on the design and development of the 1948 SE 3101 sharing much of the latter s control system and also its unusual twin tail rotors Externally it was much more refined with a rounded forward pod for occupants and engine and a slender tail boom The two crew sat side by side behind a fully glazed nose structurally the pod was a light monocoque A 149 kW 200 hp Salmson 9 Nh nine cylinder air cooled radial engine was mounted horizontally under a transmission box attached to the fuselage by steel tubes and driving a three blade rotor Some sources give the engine as a 130 kW 175 hp Salmson 9 Nc which was probably fitted to the first ground test article 1 The tail rotors were mounted above the end of the boom on shafts at right angles to it and to each other so that the rotor planes were leaning inwards at 45 to the vertical 2 At least one image shows the drive shafts within slender fairings but several others show them bare The SE 3110 landed on small wheels mounted on cantilever legs on each side and a long forward pointing sprung skid 2 3 As on the SE 3101 differential pitch settings of the twin tail rotors compensated main rotor torque there were mechanical linkages between the collective pitch the throttle and the tail pitch control to lower the pilot s workload Directional control was achieved by altering the tail pitch difference and the tail could be lifted or depressed giving longitudinal control aircraft pitch in the same way A new feature on the SE 3110 was longitudinal trim control via the main rotor cyclic pitch 2 The SE 3110 first flew on 10 June 1950 piloted by Jaques Lacarme Gaillard states that the first prototype made only two flights at low altitude before being abandoned in favour of the SE 3120 Alouette I 3 However other sources say that two SE 3110s were built appearing on the French civil register initially as F WFUD and F WFUE later transferring to the B list after gaining their Certificates of Airworthiness as F BFUD and F BFUE 4 5 In Liron s account 6 the first prototype was retained for ground durability testing but the first flight of the second prototype on 15 September 1950 rapidly ended with loss of control and a side on crash though Lacarme walked away SNCASE decided the way forward lay with the single tail rotor and with main rotor blades stabilized to prevent excessive flapping both features of the SE 3120 7 Specifications editData from Gaillard 1990 3 General characteristicsCrew Two Length 11 13 m 36 ft 6 in Empty weight 670 kg 1 477 lb Max takeoff weight 950 kg 2 094 lb Powerplant 1 Salmson 9 Nh 9 cylinder air cooled radial 150 kW 200 hp 2 Main rotor diameter 12 m 39 ft 4 in Main rotor area 113 m2 1 220 sq ft 3 bladePerformance Maximum speed 177 km h 110 mph 96 kn Cruise speed 130 km h 81 mph 70 kn Range 300 km 190 mi 160 nmi Service ceiling 4 500 m 14 800 ft References edit Parmentier Bruno SE 3110 aviafrance com in French Retrieved 7 January 2015 a b c d Helicopter development in France Flight Vol LVII no 2150 9 March 1950 pp 310 311 a b c Gaillard Pierre 1990 Les Avions Francais de 1944 a 1964 Paris Editions EPA p 111 ISBN 2 85120 350 9 Complete Historical Civil Rotorcraft Register of France part 1 Retrieved 3 January 2015 Ray Watkins collection S E 3110 Retrieved 4 January 2015 Danial Liron Les helicopteres francais de la SNCASE a Eurocopter Retrieved 3 January 2015 Gaillard 1990 Les Avions Francais de 1944 a 1964 p 128 Retrieved from https en wikipedia org w index php title SNCASE SE 3110 amp oldid 1171436420, wikipedia, wiki, book, books, library,
