"su-122 122m howitzer m1938 (m-30) range??" Topic

guys
just looking for info
the su-122 carried a 122mm howitzer m1938 (m-30)
could some one tell me the max range of this howitzer when mounted in this vehicle , i believe the max elevation was somewhere around 25 degrees ??

It was 12.67 miles as a field gun, on a T-34 chassis it was called the ISU-122 link

I assume it would then be limited to line of sight?

Assuming 45 degrees gets you the max distance, then 22.5 degrees will get you approximately 50% of that, so it would be 6.33 miles.

The SU-122 it quite a different beast than the ISU-122, different gun different role.
Judging by this I would say they were used in LOS like Herky said
link
Later, regiments were incorporated in assault squads comprising many models, the SU-122 being posted at the rear, 200 to 600 m (219-656 yd) behind the advancing columns.

At 25 degrees uses the 515 m/s HE. I have the 122mm 1938 M-30 firing table but I can't read Russian never-the-less it looks like it might be 7600 meters. (The only column with an angle @ 24° 44'.)
https://www.translatetheweb.com/?from=&to=en&ref=SERP&dl=en&rr=UC&a=https%3a%2f%2fru.wikipedia.org%2fwiki%2f%25D0%25A1%25D0%25A3-122

For indirect fire it used a periscope sight.
Wardrawings says for direct fire it used the TSh-15 telescope sight.

I had an opportunity to fire live ammunition from M-30 back in 1985. Maximum firing range is 11.8 km ( ca 7.3 miles). Elevation of field M-30 is -3° to 63.5°

SU-122 M-30 was designated M-30S
https://en.wikipedia.org/wiki/SU-122
Maximum fire distance – 3 km direct fire, up to 8 km with indirect.

Interesting that the maximum range is at 55°39' not at maximum elevation.

I have doubts that the direct fire telescope was a TSh-15 as that seems to be used in later vehicles. And I don't see a direct sight opening in the mantlet.

I don't think that a "field" M-30 has direct fire telescope – at least in normal opertaion we were not installing it on a howitzer – with D-30 I was always installing both panorama and direct fire optics in the deploy phase.
Su-122 should have direct fire optics…will check Russian pages when I'm at home.

It seems that Su-122 had the same panoramic optics as its field cousin.
link

Yes, that 'Gerza' is probably similar to a PT-6 periscope sight. There is also the problem that the HE and early HEAT shells didn't have a tracer so correcting for a miss would be a problem.

Wardrawings and Quartermaster sites incorrectly have a TSh-15 sight.

The SU-122 it quite a different beast than the ISU-122, different gun different role.

Ooops, my bad! That will teach me to trust a google search!