JAS 39 GRIPEN NG

he Saab JAS 39 Gripen (English: Griffin) is a lightweight single engine multirolef ighter aircraft manufactured by the Swedish aerospace company Saab. Gripen International acts as a prime contracting organisation and is responsible for marketing, selling and supporting the Gripen fighter around the world.The aircraft is in service with the Swedish Air Force, the Czech Air Force, the Hungarian Air Force and the South African Air Force, and has been ordered by the Royal Thai Air Force. A total of 236 Gripens have been ordered as of 2008.One interesting feature is the Gripen's ability to take off and land on public roads, which was part of Sweden's war defence strategy. The aircraft is designed to be able to operate even if the air force does not have air superiority.During the Cold War, the Swedish Armed Forces were preparing to defend against a possible invasion from the Soviet Union. Even though the defensive strategy in principle called for an absolute defence of Swedish territory, military planners calculated that Swedish defence forces could eventually be overrun. For that reason, Sweden had military stores dispersed all over the country, in order to maintain the capacity of inflicting damage on the enemy even if military installations were lost.Accordingly, among the requirements from the Swedish Air Force was that the Gripen fighter should be able to land on public roads near military stores for quick maintenance, and take off again. As a result, the Gripen fighter can be refueled and re-armed in ten minutes by a five man mobile ground crew operating out of a truck, and then resume flying sorties.]In the post-Cold War era, these dispersed operation capabilities have proved to be of great value for a different purpose. The Gripen fighter system is expeditionary in nature, and therefore well suited for peace-keeping missions worldwide, which has become the new main task of the Swedish Armed Forces.

In designing the aircraft, several layouts were studied. Saab ultimately selected a canard design withrelaxed stability. The canard configuration gives a high onset of pitch rate and low drag, enabling the aircraft to be faster, have longer range and carry a larger payload.The combination of delta wing and canards gives the Gripen significantly better takeoff and landing performance and flying characteristics. The totally integrated avionics make it a "programmable" aircraft. It also has a built-in electronic warfare unit, making it possible to load more ordnance onto the aircraft without losing self defence capabilities. The 300-link is used to share data between fighters.The Gripen affords more flexibility than earlier generations of combat aircraft used by Sweden, and its operating costs are about two thirds of those for JA 37 Viggen.In the Swedish Air Force's list of requirements was the ability to operate from 800 m runways. Early on in the programme, all flights from Saab's facility in Linköping were flown from within a 9 m × 800 m outline painted on the runway. Stopping distance was reduced by extending the relatively large air brakes; using the control surfaces to push the aircraft down, enabling the wheel brakes to apply more force and tilting the canards downwards, making them into large air brakes and further pushing the aircraft down.

The cockpit has three full colour head down displays and digital emergency instrument presentation unique to the aircraft. The cockpit layout provides a human-machine interface that eases pilot workload substantially and increases situational awareness, but still provides substantial future growth potential. The pilot flies the aircraft by means of a centre stick and left hand throttles.The cockpit provides a display area some 30 percent larger than that available in most other fighters, with the multi-function displays taking up around 75 percent of available space.It is dominated by three large (15.7 x 21 cm) active-matrix, liquid crystal, multi-function displays and a wide angle (20 x 28 degree) head-up display (HUD). The displays are equipped with light sensors for computer assisted brightness and contrast control.

 

 

2017 (c)