[烛光生存狂]-RSO加装75mm反坦克炮

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According to Ye Olde' "Encyclopedia of German Tanks...." by Chamberlain & Doyle, the armour values were:

Armoured cab:

Front & side 5mm

The book gives no angles, but measured on a photograph, I get about 40 degrees for the lower front and about 70 degrees for the upper front of the armoured cab (vertical = 0 degrees).

Gun shield: 5 + 5mm

According to Chamberlain & Doyle, the 7,5cm PaK 40 auf RSO was first discussed in August 1943, resulting in a test series of 50 vehicles which went to be field tested with Army Group South early in 1944. Allegedly only 60 were ever made, ven though plans were drawn up for mass-production in 1944, with the ultimate goal of 400 vehicles a month by July 1944.

Wolfgang Fleischer eloborates a bit about the field tests in his "Die Deutsche Panzerjägertruppe 1935-1945". The RSO was used to tow guns, but the abrupt changes of direction inherent in a fully tracked vehicle caused some problems with the adjustment of the gun (sight alignment?). To counter that problem, attempts were made to carry the guns on the vehicle, portée-style. This was possibly the origin for the trials with the 7,5cm PaK 40 auf RSO.

According to Fleischer, the field trials took place in mid-january 1944 with the 2. Armee in Army Group Center and they recieved 60 vehicles which were distributed like this:

14 to PzJgAbt 744

14 to PzJgAbt 743

14 to 18. Panzergrenadier-division

8 to Ski-Jägerbrigade 1

10 kept as reserve.

Fleischer refers to further tests with Army Group South later that month, but one wonders were they got the vehicles from? Perhaps some of the above units were transferred to AG South?

Combat experience revieled that the RSO was too slow to keep up with armoured formations and the engine too loud. Even worse was the occasional misuse of the vehicle for infantry support - StuG-style; A role for which the vehicle was entirely unsuitable.

Fleischer states that the number produced is unknown.

Fritz Hahn adds to the story in his "Waffen und Geheimwaffen...." were he states that only 60 vehicles were made because the field trials with Army Group South in February 1944 showed the vehicles to be too slow, barely making 15 km/h. In order for the vehicle to succed, it needed more power and the proposed solution was to widen the RSO to make room for two engines. Apperently that didn't work and all work on the 7,5cm PaK auf RSO was dropped.

Thats all I have on the 7,5cm PaK auf RSO.

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The following units received Pak 40/4 auf RSO:

- Pz.Zerst.Btl. 477 (Feb/Mar 1944 H.Gr.Nord, Armee-Abt. Narwa)

received 8 sometime between 20.2. and 20.3.1944. Battalion already disbanded again in early April 1944. Guns handed over to A.Pz.Jg.Abt. 752, see below (both units serving under Armee-Abt. Narwa at the time).

- Armee-Pz.Jg.Abt. 752 (Apr 1944 H.Gr.Nord, Armee-Abt. Narwa; May/June 1944 H.Gr. Nord, A.O.K. 18)

8 taken over from Pz.Zerst.Btl. 477 between 10.4. and 20.4.1944. Last reported on 1.6.1944.

No records about fate of the guns found yet, but they were apparently not lost in combat. Probably returned to an ordnance depot because of poor performance.

- Pz.Zerst. Btl. 478 (Feb - May 1944 H.Gr.Nord, A.O.K. 18)

received 30(!) sometime between 10.2. and 20.2.1944. 5 lost during last decade of April 1944. Battalion disbanded again in mid May 1944. No records about fate of the guns found yet, but the surviving ones were probably returned to an ordnance depot because of poor performance.

- Ski-Jäger-Brigade 1 (H.Gr. Mitte)

According to some entries in the war diary of A.O.K. 2 the unit received 7 sometime between 1.3. and 1.5.1944 probably for the 9.(Pz.Jg.Fla) Kp./Ski-Jg.Rgt. 1. Have not yet seen the records of the brigade, so I do not know for how long they used them.

- Armee-Pz.Jg.Abt. 751 (H.Gr.Nord, A.O.K. 16)

3 Pak 40/4 auf RSO show up only in a status report from 1.9.1944. Not before and not after that. Further details currently unknown.

The plans for allocations of Pak 40/4 auf RSO in late 1943 and early 1944 were changed frequently and in quick succession. Other units mentioned in these plans were Armee-Pz.Jg.Abt. 743, Armee-Pz.Jg.Abt. 744 and 18. Pz.Gren.Div.. I did check the records of these units and could not find any clues that they ever received them.

Data found in various records obtained from BA/MA Freiburg and NARA Washington.

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