Category Archives: Specifications

Sherman Tank Site: News Post 12, pictures and cleaning them up, a lot of them.

Sherman Tank Site: News Post 12, things have been changing, its all behind the scenes.

I’ve gotten my hands on a lot of manuals, and they are all great for gathering info on the Sherman, because you can almost always read them. The picture quality varies a huge amount depending on how it was created. There are some very common and easy to find  Sherman manuals with terrible pictures. For example the two I have on the M4A3, and the manual on the Ford GAA, both were probably photocopied multiple times, then scanned on a really early scanner.

This means, the pictures at best, are mostly black blobs, and even the text isn’t great. All isn’t lost with these, as the line drawings usually come through ok.  In some cases the manuals being sold online are these terrible photo copies printed into a cheap book with no improvements to the quality at all.

Some of these manuals have been scanned in by people with decent scanners, and these though much larger, have much nicer photo quality. Even if the scans are good, the original has to be good as well, and in some cases that’s really mixed.  I have several, scanned at very high resolution, making them restorable, to some degree.

I’ve done the most work on the Ford GAA imaged I have, and the tranny. Here is a selection of the ones I’ve done, but not all. Check out the power train and GAA pages for all of them. These are relaxing to do, and I have a ton to work with so keep checking around the site!

#68 The Chrysler Engine that could have been: The A-65 V12, Chrysler’s home designed tank motor.

The Chrysler Engine that could have been: The A-65 V12, if the war had gone on, there could have been some hotrod Shermans.

Chrysler Corporation had a big impact on the war, and US Tank production. They produced the first, and the model for the others, Tank Arsenal CDA.  They also came up with the A-57 multibank tank motor, that powered a significant number of Sherman tanks. They produced this fantastically complicated, but also reliable motor in a very quickly, and even though the US Army and Marine Corps thumbed their noses at it,  it was well liked by the British.

Chrysler on their own dime came up with a water cooled, V12, tank motor, and offered it to the Army.  It took them about a year to come up with three trial motors.  These 1568 cubic motors started out at 650 horsepower at 2600 RPM and 1485 pounds of torque at 1600 RPM on the test stand.  They came in around 3840 pounds, but there was a proposed all aluminum version that have dropped nearly 1000 pounds.  Designing and producing the prototypes, cost a grand total of 358,000 bucks, that’s over 5 million in today’s dollars. During the dyno testing period, they had a few problems with the fan drives, but these were solved with improved oiling and rolling bearings, and these seemed to have solved the problems.

They used an M4A4 as a test vehicle, and had to stretch it another 9 and 1/2 inches to fit the new motor. Installed and ready to roll the thing came in at 69,170 ponds, and a stock M4A4 came in at 69,640 pounds!  Installed, the early versions had 549 horsepower, but they upped the compression ratio and got it to 580, and it was improved even more with some carburetion changes. They made the compression change by swapping and a cam change during the in vehicle testing phase. Further testing led to the intake and carb changes.  All the while the motor was being swapped in and out, and driving tests done.

The automotive tests were very successful, and that was using the stock powertrain of the Sherman, though with so much power, they decided a gear change would help. By swapping the original 3:53:1 gears for 3:05:1 gears, they A65 was still able to beat an M4A43 in a drag race!  The engine was so promising, it’s an interesting mystery why the Army never developed it further.  Much like the GAA, there was much more performance potential in this motor, and the Army never took it any further.

I suspect what ultimately killed this motor, was the same thing that killed the GAA, the Army was looking at air cooled motors for the future, because you can save a lot of weight, if there is not liquid cooling system needed.

Special thanks goes out to Chris R, one of our readers and a source contributor, sent me a nice little history on the motor.  Thanks again Chris, sorry it took so long!!

Sources:  Sherman, by Hunnicutt, and 1943 A-65 Tank Engine History

News Post #10: Sherman Tank Site News!

Sherman Tank Site News, April of 2017 edition: Data Part II, Data Strikes again. 

The Sherman data sheets have been a very popular addition to the site, so I decided to gun and engine data sheets as well.  One motor Data Sheet is done, and the others are in the works. There are all kinds of new images and info in the various pages on the Shermans guns.

We also have a new layout to the website, instead of a lot of hard to find posts with an Index that was hard to find things in, we now have set pages,  of the main menu.

As you can see from this handy image, we have a page for the Shermans suspension and Track systems.  We have a Sherman Gun Data page. We also have a motor data page, but right now we only have the Ford GAA in it.  Now we also have pages for each tank model and a main page to find them.  There have also been minor image additions to many posts, and a few pages have received minor updates.

The Crew and their Stations post got a massive update as well. 

We also recently reviewed an inside the Hatch of the M4A1 tank.

Coming soon will be the Sherman Transmission, differential and final drive data sheet. I will also be filling out the individual Sherman model pages over the next few days. There is only so much I can do in a day!

Thanks for being interested in the site for all the guys who have commented and sent me interesting info. More great information on the Sherman tank is on the way.

 

Sherman Tank Site, News Post 9: DATA, DATA everywhere!

News Post 9: New Years News

I decided I needed more hard numbers, the kind of data that makes non tank nerds eyes roll up in their heads, stuff like how many spare periscopes were issued with an early war M4A1! One of the best way to do this is through tank Data sheets, as found in the back of many books on tanks. I used Hunnicutt’s Sherman book for some, but others I’ve made using the Hunnicutt ones as a template and then using data from the Technical Manual for the tank.

We had four, now have spec sheets for 15 different models of Sherman, and 3 Lees! You can find them all on this page. Shermom Model specification sheets. 

90mm GMC M36B1 Spec Sheet PDF

That’s not all though, I decided the gun Data sheets in Hunnicut were really interesting, so I started replicating those, but with an improved format, and slightly more data.  These gun Data Sheets can be found here, Main Guns: THings that go  BOOM!  All the guns the Sherman tank used are covered, and more are coming.

m1-M1A1-M1A2 guns 76.2 Sherman tanks

In the works are Data Sheets for each Sherman tank motor, and several experimental models. These Data sheets will have much more detailed info on the motor, and will include interesting images from the manuals for the motors.

Also in the works as dedicated pages for these data sheets, the beta test of the gun version is up and can be found here.  Next up will be ones for each tank model and then motor.

Also note the latest post on the Ram tank, The Ram: The Shermans awkward Canadian Cousin. This post covers the Canadian and British attempt to come up with a better Sherman before the Sherman design and prototype was done. I’ve been sent some very interesting documents, some are included in the post.

Thanks for reading and stay tuned for more Sherman information!

 

#30 Sherman Model Specifications: Data, and Lots of It.

Sherman Model Specification Sheets: Detailed Data Sheets For Each Model.

These were a pain in the rear to make, the ones in the back of my copy of Hunnicutt are very bad, so I have reproduced some in Word, and then print them out as PDFs, then take a screen shot of the PDF for this post. I have now hosted all the PDF files, if you want something with copy and pasteable text. I’ve got a system not for these and it’s semi easy to do, so I will keep adding them. I also added at least one, and up to five images with each spec sheet, of the Sherman the spec sheet is for. You can click to enlarge all these images, the sizes very.

M3 Lee spec Sheet

M3 Lee spec sheet in PDF


M3A2 Spec Sheet

M3A2 Lee Spec Sheet in PDF


Early Production M4 75

M4 Early spec sheet

Mid Production M4 75

M4 Mid Production


Early M4A1 75

M4A1 Early Spec Sheet


Mid Production M4A1 75

M4A1 75 mid war spec sheet


Mid production M4A2 75

M4A2 75 mid production spec sheet


Mid production M4A3 75

M4A3 75d mid spec sheet

 

M4A3 75 wet large hatch VVSS

M4A3 75w spec sheet


Early M4A4 75 


 

 


M4A1 76 wet VVSS

M4A1 76w specsheet


M4A2 76 wet VVSS

 M4A2 76w spec sheet

M4A2 76 wet HVSS

 

M4A2 76w HVSS Easy 8 Spec Sheet


M4A3 76 wet HVSS, or Sherman Easy 8

M4A3E8 76 Spec Sheet


The M4A3E2 Jumbo 75

M4A3e2 Jumbo spec sheet


Sherman Firefly VC

 

 

Firefly Vc Spec Sheet


M10 GMC

M10 GMC 3inch spec sheet


M36 GMC

M36B1 90mm GMC

 

90mm GMC M36B1 Spec Sheet PDF

 

M36 GMC spec sheet