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I would like to suggest this pre WW1 SPAAG Armored Car armed with a 5 cm BAK L/30 (Ballon Abwehr Kanone), which was made once and wasnt all that good.
It was a Simple Car, armored with plates of 3mm with a semi Turret on top with the 5 cm BAK L/30 with 2 kinds of ammo, a (SAP)HE and a Shrapnell shell. Cince there is no dedicated AT Shell, only the HE shell was reportedly effective against tanks up to 1005m (1100 yards). With the Shrapnell grenade beeing used against Infantry and Aircraft, acting like a Crude WW1 AHEAD round, having a Timed Fuze to explode mid air and rain Steel/Lead Balls onto target.
History:
With the start of the 1900s, the first partly armored cars started to appear from the british (like the Simms War Car), the french (Charron, Girardot & Voigt) around 1902. With the first fully armored cars around 1905, such as the CGV and Austrian Austro Daimler Panzerautomobil. Along these Heinrich Erhardt started development of his own ideas with a usage as AA vehicle in mind.
Because the early 1900s not only saw new development of Armored cars, but also Aircraft and military vehicles, such as Planes and Balloons/Zeppelins, new weapons, which required also a counter weapon.
As such in 1905 Erhardt mounted the 5 cm gun on the Erhardt-Decauville vehicle, which was ready for the 1906 VII. Automobil Ausstellung in Berlin, beeing even visited by Kaiser Wilhelm II.
It was powered by a 50-60 Ps engine with 3,2 ton, over a chain drive, with solid rubber wheels, with a top speed of 45 km/h which was criticsiced, as well as the 3mm armor was too thin to protect against any noteworthy rife fire and was seen as a ballast, furthermore the gun couldnt rotate 360° which hindered its main use, as such nobody was really interested in it, so it was kept at only 1 prototype.
The Gun:
5 cm BAK L/30
It had 2 rounds, overall info is sadly extremly hard to come by.
100 rounds reserve.
30-35 rpm
-5° to +70° Elevation, 60° Traverse, traversed and elevated freely with shoulder stabilizer.
Ammo:(Click to show)
SAPHE:
Gr.(P.) ((SAP)He) (Tracerless) 1,67kg 0,085kg Blackpowder 500m/s 30mm/10m
Utility:
Bodenkammer Schrapnell Gr. (Shrapnell-TF) 2,4kg 40g Blackpowder 450m/s Some Penetration?
Contains 128 Hard Cast Lead Balls of 8g and 36 Hard Cast Lead Pieces of 9g each.
Like a Crude WW1 AHEAD round, detonating mid air and ejecting the Shrapnell onto the target.
The Vehicle:
Erhard-Devauville
3mm Armor all round (and some angles)
Engine: 4 cylinder 50-60 Ps engine
Crew: 5
Weight 3,2 ton
Top Speed: 45 km/h
Source:
Notes on German Shells 1918 (Second edition)
Die Gepanzerte Radfahrzeuge des deutschen Heeres 1905-1945 (Walter J Spielberger)
Die deutschen Radpanzer im Ersten Weltkrieg Technische Entwicklung und Einsätze (Heinrich Kaufhold-Roll)