Haubits 77 (Field Howitzer 77 or FH77) is a Swedish 155 mm howitzer.
It was developed and manufactured by Bofors. It was available in two
versions, the original (sometimes referred to as Haubits 77 A) with a
sliding block mechanism, and the later FH77 B export version with an
interrupted screw breech.
In the 1960s Sweden started to look for a replacement for the French Haubits F
(Obusier de 155 mm Modèle 50). The American M109 howitzer was offered
and tested. Though the price was low the Swedish Arms Administration
found the high maintenance costs, the low rate of fire and the not so
good mobility of the M109 made it worth the effort to develop a domestic
howitzer.
The requirements for a new gun would be:
High mobility.
High momentary rate of fire.
The result was a compromise between a more expensive Self propelled howitzer and a less mobile conventional towed howitzer.
The FH77 was the first field howitzer featuring an APU to make it self-propelled for tactical movement.
The rate of fire was, at the time, exceptionally high for a 155 mm
howitzer. The FH77 could fire 3 rounds in 8 seconds, or 6 rounds in 25
seconds. In a sustained firing role it could fire 6 rounds every second
minute for 20 minutes.
FH77B
Though the haub 77 was a formidable gun it seemed impossible to export. There were two reason for this:
The maximum elevation was limited to 50°.
It did not use NATO ammunition.
Therefore Bofors developed a new version - the FH 77B. The main
difference was that the B-model used a servo operated interrupted screw
breech, instead of the sliding block action on the FH 77. The maximum
elevation had been increased from 50° to 70°. The barrel is slightly
longer, 39 calibres, and uses a single baffle muzzle brake as opposed to
the pepper-pot style muzzle brake on the 77. The engine was a Mercedes
diesel. Since the B-version used bagged charges it was somewhat slower
than the original model - 3 rounds in 10 seconds compared to 3 rounds in
less than 8 seconds. The maximum range, on the other hand, was
increased to 24km and using base-bleed extended to 28km.
Nigeria bought 48 pieces in 1980 and in March 1986 India ordered 410
of the Bofors FH 77B. The Indian also got a contract option for
additionally 1,100 howitzers.
Soon after the $1.4 billion contract with India had been signed two
Swedish left-wing journalists reviled that Bofors had paid kickbacks to
Indian public servants. As a result of this India declined to exercise
their option on the second batch. A decision India has had all reasons
to regret, as the FH 77B proved it self to be accurate, reliable and
durable.
Bofors, who had been self-assured enough to start the production of
the second batch, found them self with some 50 howitzers but no buyer.
The Swedish government stepped in and forced the Army to purchase 51 of
the B-model.
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