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Arboga Robotmuseum

RB 28

Robothistoriska Föreningen i Arboga


Sidan uppdaterad: 2017-02-20 22:27







Missile History


V-1 bomb


Navy Experimental missiles


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Saab Experimental missiles


Air-to-surface missiles


Ship-to-ship missiles


Coastal missiles


Surface-to-air  missiles


Air-to-air missiles


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Target missiles


Submunition dispenser


Missile summary table



RB 28


Air-to Air missile RB 28

The RB 28 missile was purchased for the Air Force at the same time as RB 27. The intention was to use it mainly for combatting bomber aircraft at high altitudes. It was effective at far distances, during nighttime and under all weather conditions. The RB 28 was equipped with a passive, intensively cooled IR homer with a detector made of indium and antimonid. The chosen material and the low temperature gave an IR-window within a wavelength for detecting a relatively low heat radiation and allowed tracking the target in almost any direction with less jamming influence. The missile homer and the flight control system would direct the missile, similar to the RB 27 missile, on a collision course towards an estimated point of impact according to the sight of line princtiple and they would continuously correct the missile trajectory with regards to the velocity, bearing and altitude changes of the target. The missile was normally launched during a sight-calculated collision point of interception (Direct Attack) with a feasible subsequent Lead Pursuit (LP), also called a double attack. As an alternative the missile could also be launched with the target seeker locked to a course parallel to the tie line of the aircraft during a visual aiming.


The homer required IR signals from the hot spots of the target during the flight time towards the same. The missile was aerodynamically controlled by wing rudders and it was corrected in all flight positions by a control unit, insensible for jamming interference signals. The missile avionics consisted of miniature components, where electron-beam valves of sub-miniature type were included. The power sources came from an adapted electric power supply on the carrying aircraft and after switching over to the “internal power”, coming from an irreversible, fast energizing battery and to the cooling and hydraulic systems. Prior to the launch, the missile had to be activated in steps, named A-, B-, C, and F-setting, all governed by the sighting arrangement.


These values selected the missile and the power supply but also when and how the homer should be enslaved to the indicating direction of the radar antenna or to the aiming point of the sight.


The missile was propelled by an single stage powder rocket. The warhead consisted of an explosives charge, which was initiated by impact contacts. The missile was mounted on a Missile beam (the same as for missile RB 27) and by means of cables and contacts the aircraft could support the homer avionics before launch. 


The missile RB 28 was license manufactured in Sweden by Bofors, SAAB and LM Ericsson and deliveries to the Air Force started in 1965.



1.                       Blender unit

2.                       7. Proximity fuse

3.                       Guide unit

4.                       8. Warhead

5.                       Rocket motor

6.                       9. Ignition unit

7.                       Homing unit

8.                       10. Hydraulic unit

9.                       Electronics

10.                     11. Rudder servos

11.                     Battery

12.                     12. Impact fuse


Missile 28.

SAAB /  FMV Picture


Data and Performance


6 feet 8 inches


1 feet 8 inches


135 lbs

Warhead weight

2.9 lbs

Arming requirement

Acceleration >20 g during 0.4 – 0.7 sec.

Arming time

1.0 – 2.0 sec

Automatic destruction

25 sec

Trust at 68° F

83.600 lbf (powder)

Rocket burning time at 68° F

1.3 sec 

Max controlled flight at 9.850 ft

Approx. 12 sec

Max. speed in excess of aircraft

M 1.4

Min. speed for controlled flight

M 1.0

Homer frequency band

151.18 – 216.54 microinch

Homer lobe width




      * During rotation


Homer max. angle swing


Homer max. precision velocity


Homer enslaved velocity

Approx 10°/ sec.

IR-cell service temperature

292° F

Max available cooling time

Approx 60 – 80 sec

Max available battery time

Approx 90 sec



Aircraft J 35F and J 35J



Missile types:


RB 24


RB 24J


RB 27




RB 71


RB 73


RB 74


RB 91


RB 98


RB 99