Russian
23 mm/71.7 (0.91") VYa
145.5 lbs. (66 kg)
With a muzzel velocity of
2,985 - 3,020 fps (910 - 920 mps)
thats just over mach 4!
The craft could use the guns AS thrusters!
Russian
23 mm (0.91") AN-23
These guns were gas-operated and belt-fed.
The barrel was monoblock with a blade type breech.
The systems was controlled by Ksenon-125 radar.
So I see no reason why it would require manual aiming.
The only manual operation would be the correction of
alignment from shots, and the stabalizers would be
working overtime just to keep the craft stable.
Another reason I don't see this working.
Picture
The above weapon, is one used on craft.
I didn't see anything like the such mounted
on the orbital craft. If it is armed they hid
that monster of a weapon well.
Link
Salyut 3
11.61 meters long and had a
maximum diameter of 4.15 meters.
Its useful volume totaled 47 cubic meters.
Though some science research was done, the station was
primarily used for military reconnaissance work.
Pavel Popovich, commander of the July 1974 Soyuz 14
flight to Salyut 3, is said to have indicated that the
cannon was installed on Salyut 3 but "fortunately he
was not forced to use it".
Link
Salyut 5
Was structurally similar to Salyut 3 and shared the
same official objectives -- test spacecraft systems,
design and equipment and conduct scientific and technological
research and experiments.
Included two solar panels laterally mounted to its center
and a detachable recovery module for returning data and
materials to the ground. Film could be developed and
analyzed in space and returned in the reentry capsules.
Both of their orbits decayed, and they reentered the atmosphere.
[Edited on 27-7-2003 by ADVISOR]