Более успешной деятельностью "Praga" стало производство гражданских самолетов. Особенно удачным был E.114 Air Baby, строившийся ограниченной серией даже после окончания Второй мировой войны. Это был высокоплан с размещение двух членов
экипажа бок о бок, изначально оснащенный двухцилиндровым мотором Praga B мощностью 40 л.с., также строился вариант E.115 с мотором Praga D мощностью 65 л. с.
Praga E.114 Air Baby
Тип: двухместный моноплан
Силовая установка: один 2-цилиндровый мотор Praga B мощностью 40 л. с. (30 кВт)
Летные характеристики: максимальная скорость 150 км/ч; практический потолок 3300 м; дальность 510 км
Масса: пустого 265 кг; максимальная взлетная 465 кг
Размеры: размах крыла 10,90 м; длина 6,58 м; высота 1,65 м; площадь крыла 15,20 мг
После демонстрации в Великобритании в августе 1935 года чехословацкого легкого самолета Praga E.114 деревообрабатывающая компания из Манчестера "F. Hills & Sons" приобрела лицензию на производство данной машины. Самолет представлял собой высокоплан со свободнонесущим крылом и двухместной кабиной. Чтобы попасть в кабину, необходимо было отклонить вверх часть передней кромки центроплана крыла. Максимальная взлетная масса самолета составляла 490 кг. Силовая установка включала один двухцилиндровый мотор Praga B мощностью 36 л. с. В 1936-1937 годах было построено около 30 самолетов Praga, часть из них получила 2-цилиндровые моторы Aeronca J.A.P. J-99 мощностью 40 л. с. На Praga E.114 летом 1936 года Х.Л. Брук установил новый рекорд перелета на маршруте из Лимпни в Кейптаун, затратив на перелет 16 суток.
Кроме того, фирма собрала два неудачных прототипа, первым из которых стал двухместный кабинный моноплан Hillson Pennine (1937 год). Второй, тоже двухместный (члены экипажа размещены тандемом в открытой кабине), тренировочный моноплан Hillson Helvellyn был собран в 1939 году.
Тип: двухместный легкий самолет
Силовая установка: один 2-цилиндровый ПД Praga B, 36 л. с. (27 кВт)
Летные характеристики: макс. скорость 150 км/ч; крейсерская скорость 128 км/ч; дальность 450 км
Масса: пустого 265 кг; максимальная взлетная масса 490 кг
Размеры: размах крыла 10,97 м; длина 6,75 м; высота 1,68 м; площадь крыла 14,12 м2
Flight, January 1936
Flying the Hillson Praga: A Small Machine with a Good Performance
EXACTLY what a true light aeroplane should be depends entirely on the use to which it is put, but there is very little doubt that the modern owner expects cabin comfort for serious work - unless, of course, he can obtain, alternatively, a well-screened pusher.
The Praga E.114 Air Baby - which is to be manufactured in this country by F. Hills and Sons, of Stockton-on-Tees, at their Trafford Park (Manchester) works and is to be known as the Hillson Praga - provides one example of what a really light aeroplane might be. At the time of its first visit to this country it was described and illustrated (Flight, August 22, 1935), and last week I had an opportunity of discovering something about its qualities, both from a pilot's and a passenger's point of view.
First, however, it would be useful to run over some of the points in which the prospective private owner would be interested if he saw the machine, which is, of course, a cantilever high-wing monoplane, largely of wood and plywood construction, with side-by-side cabin seating and fitted with a 40 h.p. flat twin Praga B. engine. A Pobjoy Cataract engine can be fitted if required.
In the first place, remembering its small size, there is ample room in the cabin. Pilot and passenger sit, of course, elbow to elbow, but they are not cramped, and is plenty of room for a tall passenger when the - comprising a part of the leading edge and screen - is clamped down. Behind each there is a space for a back type parachute, or, alternatively, a cushion, and the quickly detachable back rests are fitted with large canvas luggage containers. The controls and engine installation are accessible, and, in the Czech model at least, a fire extinguisher, permanently trained on the carburetter, is a standard fitting.
The wings do not fold, but the span is little over 36ft. and the entire wing can, it is claimed, be removed by two people in five minutes. It is actually attached by four bolts.
Low-pressure tyres are fitted, and though the undercarriage movement appears to be very small, the machine taxies comfortably enough over rough ground.
Various features on the original model will be modified in the production machines. The central throttle, for instance, may be replaced by two separate controls, the control column shape may be altered for improved comfort, and some adjustable loading device may be incorporated. There should be no difficulty in making a watertight screen joint - at present the interior is distinctly damp while flying in heavy rain.
The general conditions during the initial flight were far from ideal. Heavy rain, reduced visibility, and a cloud ceiling of less than 800 ft. do not encourage one to hurl a strange aeroplane about a sky out of which another machine may or may not suddenly appear, or to try the effects of various control movements at the stall. Furthermore, the Praga's one bad point from the pilot's angle - a nonexistent rearward view - was unduly noticeable in such circumstances. Nevertheless, the good forward view partially compensates for this defect, and it is possible, by judicious use of the rudder, to obtain a rearward glimpse through the side windows. When cruising, the nose is well below the horizon, and with a narrow cowling it is possible to see downwards and forwards from either seat.
Naturally, with such a low-powered engine, the take-off is prolonged, but the actual distance travelled before "unsticking" is by no means as great as one might imagine. The maker's figure of 260 ft. is probably not overoptimistic, and the climb is better than expectation. The controls are particularly light, nicely synchronised and reasonably effective. In the prevailing bad weather there was a tendency, as in all comparatively slow machines, to wallow - in other words, the reply to corrective control movements was not quite immediate. Once again, however, it must be remembered that “aerobatic” control characteristics are neither essential nor even advisable on a machine of this kind. Most of us have spent far too much time in training aeroplanes which do what they are asked almost before the controls have been moved. Nevertheless, when the Praga was being demonstrated here in August the Chechoslovakian pilot showed that it had a very pretty aerobatic repertoire.
Quite a lot of rudder is necessary to start turns, though these can be made, if necessary, on the ailerons alone - but the machine is perfectly stable and requires no particular rudder or opposite aileron once the turn has started. This machine was tail-heavy at cruising revolutions, so that it flew itself round nicely in turns of about 45 degrees.
The normal steep sideslip is not possible, the nose slewing away after a few seconds, but an equally useful and very pleasant “crab” sideslip can be held indefinitely with almost full rudder and a little aileron. The machine is, in fact, quite stable and happy in this manoeuvre at 60 m.p.h. or so.
Naturally, such a clean aeroplane has a flat glide, and with no wind would probably float after a too fast approach. But, with a stall that is so innocuous, there would be no excuse for gliding too fast. The actual landing is the simplest thing in the world, since the machine stalls in a leisurely manner, giving ample time for last-minute corrections, and the aileron control remains, weak but adequate, up to the moment of contact.
“Indicator” makes some further comments on this interesting little machine in the Private Flying section.
H. A. T.
THE HILLSON PRAGA TWO-SEATER
With Praga B. With Pobjoy Cataract.
Span 36 ft. 36 ft.
Length 21.5 ft. 21.5 ft.
Height 5.5 ft. 5.5 ft.
Weight empty 584 lb. 617 lb.
Disposable load 445 lb. 507 lb.
Wing loading 6.27 lb./sq. ft. 6.85 lb./sq. ft.
Power loading 25.7 lb./sq. ft. 14.8 lb./sq. ft.
Top speed 93.3 m.p.h. 115 m.p.h.
Cruising speed 79.6 m.p.h. 98.3 m.p.h.
Landing speed 37.3 m.p.h. 38.6 m.p.h.
Climb (in 3 min.) 1,310 ft. 2,460 ft.
Duration 3.5 hr. -
Flight, April 1936
MODERN LIGHT AIRCRAFT REVIEWED
WITHIN the next month or so we should see the first of the Manchester-produced versions of the Praga Baby, a machine in the ultra-light class which has interested amateur pilots since it was first shown in this country by the Czechoslovakian manufacturers last summer. A high-wing cantilever two-seater cabin monoplane, the Praga is of extremely clean design and cruises a t something like 80 m.p.h. on a flat-twin engine of about 40 h.p.
It is easy to fly and has a completely harmless stall - so much so that it really appears to be impossible to make it do anything out of the ordinary by misuse of the controls. Incorrect rigging caused the original demonstrator to be somewhat heavy on the ailerons, but these were effective enough to make the fact only incidentally noticeable. At his first attempt the pilot would probably find himself overshooting slightly on his approach, as the glide path is extremely flat, and this is likely to be the only trouble that he would experience. Full sideslips are not possible, but a most effective crab sideslip can be held indefinitely, and the machine, in any case, can be sat over or near the aerodrome boundary at the stall and sinking rapidly until such a moment as more speed is deemed to be desirable for the final hold-off and landing.
The side-by-side accommodation is ample for persons of normal stature, and there is a luggage space at the rear of the cabin. The forward view over the engine is excellent, though there is a lack of rearward view which might, at first, worry the pilot who has been brought up on open machines. Simply and sturdily built, the Praga should require very little maintenance.
The wing, fuselage, fin and rudder are entirely of wood and have plywood covering: the engine mounting, undercarriage, tailplane and elevator are of welded steel tubing, the horizontal surfaces being fabric-covered.
A Praga flat-twin air-cooled engine giving 36 h.p. at 2,400 r.p.m. is fitted as standard. This is of 113.5 cu. in. capacity and is claimed to be extremely economical in the matter of fuel consumption. The main petrol tank is in the wing behind the cabin, the feed being by gravity.
The specification of the Hillson Praga is as follows: Weight empty, 584 lb., disposable load, 445 lb.; span, 36ft.; length, 21.5ft.; maximum speed, 93.3 m.p.h.; cruising speed, 79.6 m.p.h.; landing speed, 37.3 m.p.h.; climb in three minutes, 1,310 ft.; duration, 3.5 hr.; price ?385. Makers: F. Hills and Sons, Ltd., Trafford Park, Manchester.
The Praga E.114 Two-seat Light Monoplane (36/40 h.p. Praga B engine).
COMPACT: The Praga 114 cabin two-seater, with 36 h.p. air-cooled flat-twin engine, which was demonstrated by Mr Kostalek at Heston last week. The machine sells in Czechoslovakia for about ?380.
The clean lines and simple design of the Hillson Praga are apparent in this view, which shows also the forward field of view available for the pilot and passenger.
By dint of clean design, the Hillson Praga has an excellent performance for a machine with a 40 h.p. engine. Production is now in full swing.
E.114 - наиболее удачная конструкция компании "Praga", но даже эта машина была построена очень небольшой серией. Характеристики двухместного самолета не могли быть высокими из-за маломощного мотора.
The Praga E.115 Two-seat Light Cabin Monoplane (65/79 h.p. Praga "D" engine).
Hillson Praga с британской регистрацией сфотографирован вскоре после окончания Второй мировой войны. Видны элероны самолета, снабженные роговыми компенсаторами, подножка для заправки крыльевых топливных баков и трубка Вентури.
The clean and handsome lines of the Praga are effectively shown in this photograph.
Mr. Brook and the Hillson Praga.
View of the licence-built Czech Praga E.114, 30 of which were built by the Manchester firm of F. Hills and Sons Ltd. Main users of the type was the Northern Aviation School and Club Ltd at Barton. This illustration shows the way in which the cabin top and leading edge lift for entry.
The business end of the Hillson Praga, showing the engine and its exhaust system (with heater muff) and the divided undercarriage.
Mrs. Crossley, the Display's lady aerobatic pilot, with Master Rice (whose father deals with the publicity) and the Hillson-Praga Baby monoplane.
The start of the London - I.O.M. Race at Hanworth. Mr. Rowarth flags away the Hillson Praga, which subsequently won the Manx Air Derby.
View of the licence-built Czech Praga E.114, 30 of which were built by the Manchester firm of F. Hills and Sons Ltd. Main users of the type was the Northern Aviation School and Club Ltd at Barton.
The installation of the 65 h.p. flat four, air-cooled Praga D engine in the Praga E-115 is unusual and interesting.
How the leading edge and part of the windscreen are folded back for entry into the cockpit. To the left is shown one of the fitted haversacks for light luggage. These lie behind the seat-backs, which are designed to accommodate either cushions or back-type parachute packs.