SAF's new artillery guns prove a big hit in NZ live-firing
exercise, but it took 2 1/2 years of tests and 2,000 shells to get
them there
By David Boey
THE army's newest artillery guns went into action for the first
time this week with a battalion of gunners in a live-firing
exercise in New Zealand.
But before full-time national servicemen from the 21st Battalion
Singapore Artillery (21 SA) fired the six Primus 155mm
self-propelled howitzer guns, the weapon had to be put through
stringent tests to prove that it would be bang on target.
It was driven across 5,000km of terrain, from desert ground and
steep slopes in South Africa to muddy tracks near Pasir Laba Camp
here to test its durability. More than 2,000 shells were
also fired over 2 1/2 years.
The big guns proved their worth this week in Exercise Thunder
Warrior at New Zealand's Waiouru live-firing range.
Looking more like a tank, as it moves on tracks and has its gun
mounted in an armoured turret, Primus is the Singapore Armed
Forces' (SAF) first self-propelled heavy artillery gun.
It was developed jointly by a team from the SAF, the Defence
Science & Technology Agency (DSTA), the national authority on
military procurements, and Singapore Technologies Kinetics, a local
weapons company.
DSTA programme manager for the Primus, Mr Koh Weng Kin, 43, said
they had to convince the SAF that the new design worked, could
endure the rigours of the battlefield, would not pose a maintenance
nightmare and, most importantly, was safe to fire.
After ditching the idea to mount the big gun on the modified
chassis of existing armoured vehicles, as these would end up being
too heavy for use on local terrain, the team came up with a
prototype vehicle in April 2000.
Having only one prototype meant that every problem, no matter how
small, had to be identified and solved, sometimes using computer
simulations, before proceeding to field testing.
Things did not always go as planned, especially when the first
shells were fired, said Mr Koh.
'We came back with a long list of failures and had to change the
design of some components.'
Captain Dinesh Vasu Dash, 29, weapons staff officer from
Headquarters Artillery, explained that changes had to be made to
the components used in a motor-driven conveyor system which moves
22 shells, each weighing more than 40kg, from their storage racks
into the gun.
Size also mattered. As the SAF wanted the vehicle to be about 3m
wide, the team had to size the components as small as possible to
fit the turret. 'But from the third firing onward, it was smooth
sailing,' said Mr Koh.
In between firing trials, the 28.3-tonne vehicle was put through
some mundane tasks.
'We filled up the fuel tank to the brim and ran it until it was dry
to see how many kilometres we could achieve.'
The trials took place in a vast, arid desert range in South Africa,
where summer temperatures soared past 40 deg C, sapping the
endurance of engineers. When winter arrived, sub-zero temperatures
were common.
Said Mr Koh: 'We spent a lot of money flying the gun out so we
wanted to maximise the time there. We made sure the mechanical
systems did not crack under the firing stress.'
As the gun was new, more than 1,700 rounds were fired without
anyone in the vehicle's turret for safety reasons. The engineers
attached a long rope to the firing lever in the turret, yanking it
from a safe distance outside the turret to fire the gun.
It was a big day for the team, when a crew was finally allowed in
the turret to fire the gun, said Mr Koh. 'It was people from ST
Kinetics and DSTA inside... It showed we were almost there.'
Another 300 rounds were fired by the engineers before the weapon
was introduced to Singapore Artillery gunners. In September 2002,
the Primus prototype was officially certified to have met SAF
requirements.
Said Staff Sergeant Dorairaj, 27, a battery sergeant major with the
21 SA: 'The gun's maker had its general manager go inside to fire
first.
'He came out alive, so that boosted our confidence,' he added with
a laugh.
--ST
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