Flight Manual: Saab 35 Draken FSX 4.1Updated: 2014-12-22

Features and special effects

Options panel




Drop tanks

Drag chute

Contrails and smoke

Chocks and covers

Pilot animations

Options paneladded in 4.1

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Fig. 23 -  Options panel

The first time you load the aircraft after installation, a panel is displayed where you can enable/disable some optional features. Your choices will be saved between sessions.

The options panel can be accessed anytime from the Views menu.

Control stick

Show the control stick in the virtual cockpit.

Exhaust heat

Enable heat wave effect from the engine exhaust.

Exhaust smoke

Enable smoke effect from the engine exhaust.

Wing condensation

Enable condensation forming on the wing.

Chocks and covers

Show optional exterior details when the aircraft is parked.

Breathing sound

Play breathing sound effect (affected by G force).


The exterior engine sounds (including the start-up and shut-down sequences) are based on stereo recordings of a Volvo Flygmotor RM6B engine, a license-built Rolls-Royce Avon 200 series engine used in the 35A/B and in the A 32 Lansen. It is identical in sound to the RM6C used in 35D/F/J/OE.

Interior engine sounds were difficult to recreate as no usable cockpit recordings exist AFAIK, so these sounds were made up by processing the exterior sounds. You are of course welcome to replace the included sounds with whatever sounds you prefer.

The instrument panel switch and warning sounds were synthesized for better clarity, but they are similar to the real sounds.

The sound control gauge was developed by Douglas Dawson and is included in the freeware versions of Draken with his kind permission.

Breathing sound

When the oxygen valve is open, the sound of the pilot's breathing can be heard. The breathing will get heavier with increasing G load.

This effect can be enabled/disabled from the Options panel.

Afterburnerchanged in 4.1

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The single-stage EBK-67 afterburner (reheater) adds approximately 20 kN of thrust to the 57 kN dry thrust of the RM6C (Rolls-Royce Avon 300 Mk. 60) engine.

In the real Draken the afterburner is activated by pushing the throttle past the normal maximum (MIL) position to a spring-loaded stop. In this simulation it is activated with the Toggle Afterburner command (Shift-F4). Please note that it will not be activated automatically at full throttle as in most other FSX jet fighters.

The following conditions need to be fulfilled to be able to activate the afterburner:

When the afterburner is activated you will feel a notable thrust boost, and the EBK warning light is lit for a few seconds while the exhaust nozzle eyelids open. As in the real world, the afterburner makes no difference in the sound of the engine.

To cut off the afterburner, pull back momentarily on the throttle. The warning light will light up again briefly while the exhaust nozzle closes.

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Fig. 25 -  EBK warning light

The EBK warning light is not an indicator for active afterburner. It lights up when the exhaust nozzle hydraulics are operated and on afterburner malfunction.


The canopy is opened with the Select Exit key command (Shift-E is default). When the canopy is unlocked (open in FSX), the canopy warning light HUVLÅS will be lit.

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Fig. 26 -  Canopy open

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Fig. 27 -  Canopy warning light

If the canopy is opened during flight it will detach from the aircraft.

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Fig. 28 -  Oops. We now have a 35J Convertible.

Drop tankschanged in 4.1

The J 35J was standard-equipped with two 525-liter external tanks under the fuselage but could also be fitted with two additional tanks on the two wet outer wing pylons. Wing tanks are however not available in this version. See also Fuel system.

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Fig. 29 -  J 35J with 4 external tanks

The external tanks are jettisoned with the key command Drop Tanks 1. Be sure to check your key assignments in Flight Simulator, as you may have to add this key command yourself. Two successive keystrokes are needed: The first click will arm (unlock) the mechanism, the second will release the tanks.

A toggle switch on the left side of the canopy frame was used to arm either belly or wing tanks for release, and a button (protected by a red plastic membrane) was then pushed to jettison the tanks. The arming switch is not functional in this version.

A similar button is used to jettison the canopy. Take care not to press that button by mistake (as happened at least once in real life).

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Fig. 30 -  Tank and canopy jettison switches

Drag chutechanged in 4.1

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Fig. 31 -  Landing with drag chute

The drag chute lever and indicator are located on the throttle console. In the simulation the chute is operated with the Increase Flaps Incrementally key command (F7). The first click will deploy the chute, the second will drop it.

If you deploy the chute accidentally (easy enough as it uses the flaps command) you can reset it in the simulation by clicking on the chute indicator.

The function is mechanical and will work without hydraulic and electrical power. The chute lever can only be operated if the throttle is below 90 %.

To prevent damage to the chute cords from the engine exhaust, the chute should be released as soon as ground speed is low enough to use wheel brakes.

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Fig. 32 -  Drag chute controls

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Chute stowed (ready for deployment)

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Chute deployed

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Chute released (dropped)

Contrails and smokechanged in 4.1

Engine starter smoke

When the engine is started, yellow smoke from the AVPIN (isopropyl nitrate) starter motor will emanate from a valve underneath the left ram air intake.

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Fig. 33 -  Starter smoke effect

Exhaust heat

A very subtle effect of heated air emanating from the engine exhaust. It will increase with thrust and is only visible on the ground.

This effect can be enabled/disabled from the Options panel.

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Fig. 34 -  Exhaust heat

Exhaust smoke

The RR Avon/RM 6 engines normally do not produce much smoke except on startup and on full throttle. A big smoke trail indicates that fuel is not being completely burnt, usually due to residue or wear in the injection system.

This effect can be enabled/disabled from the Options panel.

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Fig. 35 -  Exhaust smoke


Wingtip contrails and wing condensation may appear with high G load, depending on temperature and relative humidity. A contrail will also appear at high altitude and/or air temperatures below -30 °C.

The high-G vapor effect can be enabled/disabled from the Options panel.

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Fig. 36 -  Condensation effects in a high-G turn

Chocks and covers

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Fig. 37 -  Details visible when parked

When the aircraft is parked and the engine is completely shut down (turbine not spinning), additional details such as the ladder, intake and exhaust covers, wheel chocks, etc. will become visible. They will disappear when the engine is started.

This effect can be enabled/disabled from the Options panel.

Pilot animations

G force effects

The upper body of the pilot moves laterally and longitudinally as G force is applied. The head of the pilot turns with rudder pedal input.

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Fig. 38 -  Pilot moving with G force

Helmet visorchanged in 4.1

The suit cooling switch DRÄKT VENT controls the helmet visor in this simulation.

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Fig. 39 -  The helmet visor