|Année du premier vol
(ou de design, si seul projet)
|Pays||Afrique du Sud|
|Designer(s)||BEATTY, Patrick James & JOHL, Wilfred A. Theodore (Fritz)|
|Premier constructeur||Patrick James BEATTY (SA)|
|Surface alaire||12.3 m2|
|Profil aile||Emplanture NACA 631212, saumon NACA 0009-64A-0.8|
|Masse à vide||--|
|Masse maxi||522 kg|
|Vitesse maxi||285 km/h|
|Finesse maxi||40 à 130 km/h|
|Taux de chute mini||0.67 m/s à 74 km/h|
|Structure||Composite fibre de verre|
|Infos techniques||Empennage en T|
|Histoire résumée||The BJ-3|
The tremendous success of the BJ-2 naturally resulted in the design of a
successor, the BJ-3. By this time, Fritz Joel had moved to South-West
Africa, but he still did most of the drawings, aerodynamics and stressing.
Although the BJ-3 was in concept a natural evolution of the BJ-2, it was
radically different in structure. Only the tailplane was still of plywood
construction. Like all Pat's subsequent gliders, the wing had an aluminium
structure. The wing skins were foam stabilised glass fibre. The front
part of the fuselage was also of glass fibre, but the tailboom, fin and
rudder were aluminium. Aerodynamically, the fuselage was sleeker, the wing
span and Fowler flap area greater, and the wing loading higher. An NACA
66-series airfoil was used, to obtain even lower profile drag. Although
airbrakes were fitted, the drag chute was retained. Even though the glider
was built at Pat's company, Performance Sailplanes, in Germiston, it was
still very much a homebuilt. Glider building was a hobby, and not the
mainstream activity at the factory. The BJ-3 had its first flight in 1965.
In the capable hands of Pat and 'Bomber' Jackson, the BJ-3 also achieved
several world records, and won the South African championships in 1968.
The sole BJ-3 was modified to become initially the BJ-3A, and later the
The BJ-series of sailplanes are unusual in that they are designed for a particular climate. From experience gained with the successful BJ-2 Mt P.J. Beatty (RIP) of Johannesburg built the the BJ-3 , designed by Mr W. A. T. Johl especially to take advantage of the strong South African Thermals. First flight was in 1965 and on 28 December 1967. The BJ-3 set up an international speed record over a 500 km triangular course of 135.32 km/ht (73.01kt).
Construction is almost entirely of metal, only the forward part of the fuselage being glassfibre. The wings are of dural secured with round-headed rivets to a wide spar; this structure is then covered with polystyrene foam and glassfibre applied to the upper surface to achieve a smooth finish.. Like the BJ-2 this aircraft uses Fowler-flaps which, when extended, increase the wing area by 30% and can be lowered to a maximum of 30 degrees.. Four sets of DFS-type double airbrakes are fitted. The retractable landing wheel with brake is situated behind the centre of gravity.
The BJ-3A was developed from the BJ-3 in 1968.
|Liens personnalités||BEATTY Patrick (Afrique du Sud) |
JOHL Wilfred A. Theodore (Fritz) (Afrique du Sud)
|Liens WEB||Site : Alex . Note + specs (pas de photo). (2010-03-20 CL)|
Site : Google Groups . Texte. (2016-11-12 CL)
|Livres||Pas de livre référencé.|
|Autres sources||Source: "Stephen Thomas" |
Soaring juillet 1966 p 16. Note + photo
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