From Wikipedia"
The
A-5 was developed after it was determined that the Fw 190 could easily
carry more ordnance. The D-2 engine was moved forward another 15 cm (6
in), moving the center of gravity forward to allow more weight to be carried aft. Some A-5s were tested with the MW 50 installation: this was a mix of 50% methyl alcohol
and 50% water, which could be injected into the engine to produce a
short-term power boost to 2,000 PS (1,973 hp, 1,471 kW), but this system
was not adopted for serial production. New radio gear, including FuG 25a Erstling IFF, and an electric artificial horizon found their way into the A-5. The A-5 retained the same basic armament as the A-4.
The A-5 too, saw several Umrüst-Bausätze kits. The U2 was designed as a night Jabo-Rei
and featured anti-reflective fittings and exhaust flame dampeners. A
centre-line ETC 501 rack typically held a 250 kg (550 lb) bomb, and
wing-mounted racks mounted 300 L drop tanks. A EK16 gun camera, as well
as landing lights, were fitted to the wing leading edge. The U2 was
armed with only two 20 mm MG 151 cannon. The U3 was a Jabo
fighter fitted with ETC 501s for drop tanks and bombs; it too featured
only two MG 151s for armament. The U4 was a "recon" fighter with two RB
12.5 cameras and all armament of the basic A-5 with the exception of
the MG FF cannon. The A-5/U8 was another Jabo-Rei outfitted with
SC-250 centreline-mounted bombs, under-wing 300-litre drop tanks and
only two MG 151s; it later became the Fw 190 G-2. A special U12 was
created for bomber attack, outfitted with the standard 7.92 mm (.312 in)
MG 17 and 20 mm MG 151 but replacing the outer wing 20 mm MG-FF cannon
with two underwing gun pods containing two 20 mm MG 151/20 each, for a
total of two machine guns and six cannon. The A-5/U12 was the
prototype installation of what was known as the R1 package from the A-6
onwards. The A-5/R11 was a night fighter conversion fitted with FuG
217 Neptun (Neptune) radar equipment with arrays of three dipole
antenna elements vertically mounted fore and aft of the cockpit and
above and below the wings. Flame-dampening boxes were fitted over the
exhaust exits. 1,752 A-5s were built from November 1942 to June 1943.
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