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

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World War Two on the Land

549 hits since 24 Feb 2019
©1994-2019 Bill Armintrout
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wardog24 Feb 2019 2:22 p.m. PST

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 ??

Personal logo Herkybird Supporting Member of TMP24 Feb 2019 5:06 p.m. PST

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?

Thresher01 Supporting Member of TMP24 Feb 2019 5:27 p.m. PST

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.

Barries Lead Mountain24 Feb 2019 5:47 p.m. PST

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
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.

Mobius Supporting Member of TMP24 Feb 2019 6:31 p.m. PST

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'.)

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

Barin125 Feb 2019 2:57 a.m. PST

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
Maximum fire distance – 3 km direct fire, up to 8 km with indirect.

Mobius Supporting Member of TMP25 Feb 2019 8:07 a.m. PST

Interesting that the maximum range is at 5539' 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.

Barin125 Feb 2019 8:28 a.m. PST

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.

Barin125 Feb 2019 10:24 a.m. PST

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

Mobius Supporting Member of TMP25 Feb 2019 10:49 a.m. PST

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.

Personal logo Herkybird Supporting Member of TMP03 Mar 2019 3:11 p.m. PST

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!

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