Beatty-Johl BJ-4

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 Partick BEATTY (SA)
Type d'appareil Planeur
Fonction Performance

Surface alaire--
Profil aile--
Masse à vide--
Masse maxi--
Charge alaire--
Vitesse mini--
Vitesse maxi--
Finesse maxi
Taux de chute mini--
Nb sièges1
StructureComposite fibre de verre

[Photo d'origine inconnue]
[Dessin Michel Blanchard]


Partick BEATTY (SA)2
Nombre total de constructions2
Infos techniquesStabilisateur monobloc compensé. Volets Fowler.
Histoire résuméeThe BJ-4
The success of the BJ-2 and BJ-3 prompted a more ambitious scheme. Two BJ-4's were built, with Hugh Keartland sponsoring the construction of the second one. The objective was to win the world championships in Texas in 1970. Although visually very different, the BJ-4 was a further evolution of the BJ-2/3 concept. The construction was similar to the BJ-3, but the fuselage was much sleeker, and the T-tail was abandoned. A very tall high aspect ratio vertical fin was used. The wing was essentially similar to the BJ-3, retaining the very large Fowler flap over 80% of the wing span.
Once again, it was regarded as an extremely advanced glider. The two BJ-4's were to be flown by Pat and Bomber Jackson in the world championship. The world championship was a disaster for the BJ-4. Pat Beatty was eliminated on the first day of the contest, when a passing car struck one of the wings of the glider, when it was being derigged after an outlanding on a freeway! To add insult to injury, the unfortunate pilot was also fined $ 150.00 for his indiscretion. Jackson also struggled with the unexpectedly weak weather in Texas, and it became clear that the BJ-4 was no match for the latest German gliders, which used simple plain flaps, combined with very large wing spans. It signalled the end of the 'variable geometry' trend of development in glider design. Although several variable geometry gliders have been developed all over the world since 1970, only one, the SB-11, has been truly successful. Both BJ-4's are still flying
today though, testimonies to fine engineering, and monuments to innovation.
Liens personnalitésBEATTY Patrick (Afrique du Sud)
JOHL Wilfred A. Theodore (Fritz) (Afrique du Sud)
Compléments docs


Liens WEBSite : Google Groups . Texte. (2016-11-12 CL)
Site : John DeRosa's Aviation Web Page . 6 photos. (2016-11-12 CL)
LivresPas de livre référencé.


Pas de plan ou kit référencé.
Fiche n° 1645 [Dernière mise à jour : 2016-11-12]