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'Early' hoods with Direct Vision blocks (DV)
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Theearliest Sherman tanks were provided with 'direct vision' portsinstalled in the driver's and assistant driver's positions. Althoughthe direct vision appears to provideprotection, the designers noted that small gaps permitted the entry ofbulletsplash. Ultimately, direct vision was ordered eliminated on June 241942 forcast hulls and August 13 1942 for welded hulls. It would take some monthsbefore theredesigned drivers' hoods could enter production, and several thousandShermanswere built with direct vision. Here are shows the direct vision ports on 'Michael', the oldest Sherman still in existence.
EarlyM4A2 Direct Vision blocks and hoods, as installed on the first ALCOM4A2 hull. Current evidence suggests that most or all of the 150 ALCObuilt M4A2s haddirect vision.
Photos courtesy of Neil Baumgardner.
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Another early M4A2 with DirectVision blocks. The hatches are the initial configuration and do not have counterbalance springs (Kurt Laughlin).
This particular tank islocated at Saint-Martin-de-Varreville, near Utah Beach.
Early M4A4s DirectVision blocks and hoods. The minutes of a conferenceheld at Lima Locomotive Works on 4/27/42 discuss a gap in the direct vision configuration thatexposed the drivers to bullet splash. The remedy proposed to the bullet splash issue was theaddition of a splash guard in front of the DV block. This bullet splash can be seen on the photos above.
Thedirect vision slots were considered ballistic weak spots. A great partof Sherman tanks that had them can be seen to have the drivers' hood'appliqué' armor modification which was installed at the factory or indepots in the US, or in the UK before D-Day. In the two photos above,one can just see the direct vision visors hidden behind the drivers'hood applique plates. Note also the positive hatch lock mechanisms with equilibrator springs; modifications that were introduced in the second half of 1943, and retrofitted to many Shermans that had been built without them.
Direct Vision blocks andhoods, as seen on an early M4A1 located near Dompaire, in France. The driver's hoodapplique plates obscure the direct vision slots. The Field ServiceModification Work Order for these plates was published in late August, 1943. Themodification did not apply to the M4A1 as it was thought that the cast armor infront of the drivers' hoods was better contoured, and not as vulnerable as theprotruding hoods used on welded hull Shermans. However, based on a few periodphotos and surviving examples, it would appear that direct vision M4A1sreceived this mod during remanufacture, and, overseas 'in the field'in some instances. The positive hatch lock mechanisms andequilibrator springs were introduced in the Spring of 1943, and could havebeen added as a field modification or during remanufacture.
Later hoods without Direct Vision
Only Chrysler (M4A4) and Ford (small hatch M4A3) used 'wide' drivers'hoods castings on their Shermans. Small hatch M4s andM4A2s manufacturers made use of 'narrow' drivers' hood castings. Note how the 'wide'casting included a section of the glacis along with the driver'shood. The lines in red on the pictures above show the weldpatterns of the wide vs. narrow drivers hoods. Thus, the 'narrow'versus 'wide' hood casting is a recognition feature and would help torecognize an M4 or an M4A2 vs an M4A3 or an M4A4. Left-side photocourtesy of Paul Hannah.
Hoodsand hatches, asseen on a small hatch M4A1. Direct Vision was eliminated from theM4A1 design by the three M4A1 manufacturers by August, 1942.
Cast hoodsand hatches, asseen on Federal Machine and Welder (FMW) M4A2s and late Pullman Standard small hatch tanks.
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Castdrivers hoods installed on ALCO M4s have a slighly different designthan FMW and Pullman ones, and are a recognition feature of tanksproduced by thismanufacturer.
In late 1942, Fisher transitioned from direct vision to 'fabricated' drivers' hoods. Note thevery sharp, angular appearance of the hoods. Fabricated drivers' hoods were exclusive toFisher-made M4A2s and were set up to save foundry capacity. The other builders used castings.
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A little bullet splashcan be seen on some Fisher & ALCO Shermans, but not all of them. Itprotects the hinge knuckles. It was an official part that seems to have beenintroduced in mid 1943. The reason why this part was not added on otherShermans is unknown.
'Wide' drivers hoods castings, as seen on Ford M4A3 Sherman tanks.
The drivers hoods castings used on Chrysler M4A4 Shermans are similar to the Ford M4A3 ones.
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