Thomas L.Jentz, Hilary Louise Doyle - Panzerjaeger (3,7 cm Tak to Pz.Sfl.Ic) development and employment from 1927 to 1941, Panzer Tracts No.7-1, rok vydania 2004, ISBN:0-9744862-3-X
URL : https://www.valka.cz/10-cm-K-18-auf-Panzer-Selbstfahrlafette-IVa-t8905#363111
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In the year 1938/39 bol commenced a development program on the construction of the ťažkých self-propelled ' twas intended to carry out any business pevnostných objektov (preliminaries to the fight against pevnostiam francúzskej Maginotovej line). Vznikol zdĺhavý and challenging project ever explored sa menili format requirements and tried to sa skĺbiť all the format requirements within one kompromisného riešenia konštrukcie (limited dimensions, hmotnosť, hrúbka pancierovania...). In počiatkoch development job-there were two key developmental vetvy. Pz.Sfl.IVa1 bola návrhom with the platform with ôsmimi pojazdovými kolesami and Pz.Sfl.a2 so šiestimi pojazdovými kolesami. Work on the Pz.Sfl.a2 boli neskôr repealed, continued sa len Pz.Sfl.a1. 25.4.1939 company Krupp submit dvojicu výkresov on a proposal konštrukcie. Drawing W1298 display the vehicle with motorom umiestneným under kanónom. This riešenie malo advantage in the fact that in contrast to the design on the drawing, W1299 prečnieval cannon in front of the vehicle on the 800mm change. Disadvantages bol impaired access to the engine, inadequate bola assembly chladiča and ventilátora, the crew would've been miserable nadmerným hlukom of the engineand, thermometer and výparmi, inappropriate bolo riešenie prevodovky, the machine mal vysokú palnú height, machine bol "ťažký on the head" and pri streľbe would dochádzalo to nestabilite. The Pri proposal on the drawing, W1299 bol engine and chladiaci system for kanónom, where bol access to engine trouble, the machine mal and nižšiu palebnú height. Nevertheless zjavným disadvantages WaPrüf ensure to view that lepšou voľbou will verzia W1298. Ďalšie format requirements WaPrüf použitie torzného odpruženia, exchanging engineand from 12-valca for the 6-drum and požiadavka on uloženie engineand under kanónom mala company Krupp zakomponovať in a new proposal, ktorý mal even supplied 15.5.1939. 2.5.1939 bol on stretnutí zástupcov company Krupp and WaPrüf 6 prejednávaný proposal W1300 with motorom under kanónom. Cooler mal albeit mounted in the prednej the right side of the hull pre better bočný access to the engine. Disadvantageous substitute ťažkého and veľkého 12-valca Maybach HL 120, bol 6-drum Maybach HL 116, who, however, mounted palebnú height to 2100mm. Fallback, sa črtala the possibility of mounting a 6-valca Maybach HL 66. For úspore weight sa mala namontovať transmission and riadiaca unit of VK 9.01. Must use sa mali belts without the need for mazania and without gumených podložiek. 15.5.1939 sa held a ďalšie stretnutie, where boli odprezentované drawing suggestions W1301 and W1303. The draft W1301 rátal with motorom Maybach HL 116 (about 300k) and with a good prístupom to the engine. The total hmotnosť mala albeit 24 ton. The draft W1303 rátal with the use of the engineand Maybach HL 66 (about 200k). The total hmotnosť mala dosiahnúť 22 ton. This proposal was WaPrüf 6 preferred. Bol certificate awarded súhlas with the position of the dreveného model in mierke M 1:1. Subsequently, the company Krupp inform WaPrüf 6, that the pri náhrade odpruženia torznými tyčami for odpruženie of B.W. (Pz.Kpfw.IV) dôjde to úspore weight and priestoru in korbe. 23.5.1939 bol odprezentovaný drawing draft W1307. The proposal rátal with presunom chladiča of the prednej part of the hull to look for parts, what would skráteniu engine, and about 40-50mm and the team to ďalšej úspore weight. WaPrüf with this návrhom súhlasilo. WaPrüf skúmalo chance použitia prekladaných pojazdových kolies (Schachtell-Laufwerk), well there would be a neakceptovateľnému nárastu weight of two tony. Preto mal project zotrvať on 6-kolesovom chassis .W. (Pz.Kpfw.III) spring-loaded torznými tyčami. Followed ďalšie design proposals eg. W1316 with modifikáciami pancierovania and tvarom and optical equipment kabíny vodiča. The final rozhodnutie about špecifikáciách fell 21.8.1939. Engine mal though Maybach HL 66 P, transmission and riadiaca unit mali pochádzať of the project VK 9.02. The first two prototypes of mali mať 8-paddle podvozok of B.W. (Pz.Kpfw.IV). Prototypes of mali, albeit made of pancierovej steel and mali even fully armed and rigged. Keďže company Krupp prefer designs with torzným suspension (s Sk 3413, Sk 3414 and Sk 2415), where vymenovala viaceré prednosti takéhoto chassis was ordered and a prototype with a 6-kolesovým podvozkom .W. a Prototype of our albeit armed, hmotnosť loadout malo simulovať závažie. Constantly dochádzalo minor change, upresňovaniu konštrukčných návrhov and návrhov výbavenia. Najmarkantnejšou change on stretnutí zástupcov company Krupp and WaPrüf 6 of 10.-11.10.1939 bola replacing the prevodovky for ZF SSG 46 and riadiacu unit MAN Cletrac. Dad changing the bola is potvrdená 4.11.1939. Pojazdové kolesá mali pochádzať gi series Pz.Kpfw.IV Ausf.E. The main gun, 10cm gun sK 18 used dvojdielnu delenú muníciu little typov. Celkovo you self-propelled delo viezlo 26 nábojov. In 8/1940 mali even finished both prototypes (with the third prototypom with podvozkom From.W. storznými tyčami sa simmilar nerátalo) and subsequently after preukázaní úspešnosti konštrukcie sa was considered on the order of 100 kusov prescribed self-propelled ' twas. Pôvodný term dokončenia prototypov sa naťahoval and in fact, boli prototypes are completed in 1/1941. Tieto prototypes boli 31.3.1941 predstavené Adolf Hitler and subsequently mali, albeit odoslané to otestovaniu in martial jednotkiek. The planned serial production of sa by making that assumption niekedy on the jar 1942.
The first zmienka about the nasadení prototypov in Pz.Jg.Abt.(Sfl.) 521 sa dates back to the 23.6.1941 in attack on zoskupenie pechoty east from bieloruského Kobrynu (bielorusky: Кобрын). One exemplár bol in 7/1941 destroyed výbuchom munície (malo sa jednať about samovznietenie nábojov from the warm engineand and tall letnej temperature) probably in the vicinity of the Borisova. The wreck is known from many photos, bol started prevezený to Germany and under photos you can usúdiť that poslúžil as a practice pomôcka. The second prototype has successfully fought up to the end of the year 1941, and then bol taktiež with poškodením stiahnutý to make repairs to a company Krupp. The machine was under older published tvrdení in vojakov known under the neoficiálnou prezývkou "Dicker Max" (tlstý Max). Surviving the prototype of the sa after the hours got to východnú front, where he fought in the pôvodnej jednotke Pz.Jg.Abt.(Sfl.) 521 alongside rfect person from another ťažkého stíhača machines Pz.Sfl. für 12,8 cm K40. Machine niesol neoficiálne version of "Brummbar". Probably was destroyed on the stalingradskej the front as his väčší súputníci. In hláseniach from 11-12/1942 have not.
*source:
Thomas L. Jentz, Hilary Louis Doyle - Panzerjaeger (3.7 cm that the Pz.Sfl.Ic) development and employment from 1927 it 1941, Panzer Tracts No.7-1, the rok vydania 2004, ISBN:0-9744862-3-X.
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URL : https://www.valka.cz/10-cm-K-18-auf-Panzer-Selbstfahrlafette-IVa-t8905#26502
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