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Armor/AFV: Allied - WWII
Armor and ground forces of the Allied forces during World War II.
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Firefly question
KurtLaughlin
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Posted: Wednesday, July 06, 2016 - 04:53 AM UTC

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Gee, I thought this forum was all about asking advice and feedback on concepts and projects, among other things - but I guess you'd like to change all that to suit your own little find-things-out-for-yourself attitude.



Ah, absolutism. If someone complains about a small minority of a group, attack them by saying that they must be against the entire group.


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. . . grammar Nazi . . .



Grammar Nazi? Didn't we cover that earlier? Yup, today, 10:37 AM.


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I've already wasted enough time that could have been better spent model building.



Now whose fault is that?

KL
sideways
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Posted: Wednesday, July 06, 2016 - 05:00 AM UTC
who knew Americans actually indulged in sarcasm, I was lead to believe they didn't understand it?!
Biggles2
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Posted: Wednesday, July 06, 2016 - 08:31 PM UTC
Well, some give it a fair try.
easyco69
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Posted: Wednesday, July 06, 2016 - 09:05 PM UTC

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M4's were all factory painted US OD. So when they were converted to Firefly's, the British work (on mantlet, new gun barrel, enlarged turret bustle, blanked-off bow MG, etc., etc.) would have been painted/re-painted with the British version OD (which was slightly more greenish). I can't really see them as re-painting the entire vehicle as that would be a waste of resources. (M4's in British service in North Africa were repainted sand colors, but generally only to the bottoms of the sponsons; lower hulls were usually left OD - although a white counter-shading was sometimes employed). Can anyone verify that Firefly's appeared in two shades of OD (both British and US)? If so, any surviving Firefly's into 1945, and after paint fading, would the two colors have shown a marked difference - British OD to a greenish hue, and US OD to a brownish hue?



a similar thought hit me about two weeks ago, and here's why.

I have several Sherman books from various sources. I found this one that seems to cover all of them from the prototype to the M4a6. The book deals a lot with manufacturing, and I saw this one photo of two M4 turrets mounted on a very large indexing table that was mounted to an even larger boring mill. The turret closest to the camera was a Firefly turret! Not even the slightest doubt about it! Can't remember the exact plant location, but seems like it was either Michigan or maybe Ohio in the USA. This tells me that they wouldn't ship a primer painted turret to England for assembly as it would likely be a ball of rust. Plus it would have been much easier to simply install the turret on a hull during assembly. Then they just had to seal off the back opening (radios), and paint the tank.
gary



Didn't the British do the conversion on British soil? I mean, didn't they get lend lease Shermans shipped in from USA & then modify them into Fireflys?
Biggles2
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Posted: Wednesday, July 06, 2016 - 09:27 PM UTC
That point was already covered. The Brits received standard M4's and converted them in factories such as Vickers.
m4sherman
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Posted: Wednesday, July 06, 2016 - 09:30 PM UTC
If you can find it, (and afford it!) Mark Haywards Firefly book has a lot of information on the Fireflys.
m4sherman
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Posted: Wednesday, July 06, 2016 - 09:40 PM UTC

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who knew Americans actually indulged in sarcasm, I was lead to believe they didn't understand it?!



How you say a phrase is what makes sarcasm interesting. It's as lot more fun than typing it out.
trickymissfit
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Posted: Thursday, July 07, 2016 - 12:24 AM UTC
in the Haynes book, it's stated that there were just a little more than 2000 Fireflys built in all various forms. Thinking on this, one almost has to wonder why? The hulls were 95% standard Sherman issue. Seems that I read once that like the U.S., the Brits modified the 17 pounder gun mount to fit the U.S. style (U.S. did a similar thing with the 76mm mount). So it appears that the rear cut out was the biggest mod done. Yes the ammo storage probably was changed along with all radios and such.

With the above out of the way; why did the Brits even bother to do the cut out in the turret? Same can be said about ammo stowage. Would not have been a little more feasible to cut the rear port out while going thru the machining process. Looks like internal hull mods could have been done in a fraction of the time if they'd been done on the assembly line.

Still one has to assume that the tanks sent to England were ear marked for modification before they went out the door over here. The turrets were a high alloy grade of cast steel. Takes some pretty good equipment to machine it. (I have cut a lot of armor plate) It will flame cut just fine (1.5" or less in thickness). Welds just fine, but also cause some bad issues after the weld cools down. Using a torch to cut the pocket is close to being stupid, but it'll cut just fine. Machining the window is the correct method to do without destroying the metallurgical properties. Cutting the pocket out would have taken about three to four hours with tooling and equipment of that era. (very large and expensive equipment). The ammo stowage and other items needed could have been prefabbed on either side of the pond.

What I see is a tank being built, and then being ripped apart while it's still brand new to make something different. No wonder they only made 2000 of them, when they could have made 8,000 of them! Sure looks like it would've been easier an cheaper to send basic hulls with no turrets, and turrets ready to assemble in whatever configuration that was the flavor of the day.

Not trying to be a troll in anyway, but I know something about assembling tanks and making them.
gary
m4sherman
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Posted: Thursday, July 07, 2016 - 12:53 AM UTC
Gary,

The US did not help with the 17 pounder coversion because "we" did not want the weapon, and did not want to put the resources into the project. As a result they had to use already manufasctured tanks as they were allotted to the UK under lend lease. They had no choice over what was being procuced.

There was a very specific list of features for a tank to qualify for the 17 pdr conversion. Many tanks in the UK did not meet those requirements.

True, it does not make any sense to us 70 years later, but it is what it is.
Biggles2
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Posted: Thursday, July 07, 2016 - 02:51 AM UTC
The 17lb's recoil took it all the way to the back of the turret. The British radio sets were always situated at the rear of the turret. To make room for the radio, they had to cut a hole in the rear turret wall and make a bustle extension. Guess they just couldn't find another location for the radio.
m4sherman
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Posted: Thursday, July 07, 2016 - 03:35 AM UTC

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Gary,

The US did not help with the 17 pounder coversion because "we" did not want the weapon, and did not want to put the resources into the project. As a result they had to use already manufasctured tanks as they were allotted to the UK under lend lease. They had no choice over what was being procuced.

There was a very specific list of features for a tank to qualify for the 17 pdr conversion. Many tanks in the UK did not meet those requirements.

True, it does not make any sense to us 70 years later, but it is what it is.



Way too many typos!

With the bow gunner gone to make room for the ammo rack, the back of the turret is a logical location.

If you look at the cut out in the turret back wall it is smaller than the inside space of the welded on bustle. Any loss of armor strength would be inside that box.

However, and the British tankers used to say, "Your not keeping out an 88 anyhow".
trickymissfit
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Posted: Thursday, July 07, 2016 - 08:08 AM UTC

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Gary,

The US did not help with the 17 pounder coversion because "we" did not want the weapon, and did not want to put the resources into the project. As a result they had to use already manufasctured tanks as they were allotted to the UK under lend lease. They had no choice over what was being procuced.

There was a very specific list of features for a tank to qualify for the 17 pdr conversion. Many tanks in the UK did not meet those requirements.

True, it does not make any sense to us 70 years later, but it is what it is.



How does that relate to my post? I simply said the U.S. modified the 76mm gun mount to fit the Sherman turret, and from what I've read the Brits did similar things with the 17 pounder. The main issue with the 17 pounder was recoil travel inside the turret. I gather chamber pressure was close enough to not worry about it. My only comments were directed as to why? There was a much simpler route to get the same results.

Gary put italicized text here put italicized text here put italicized text here put italicized text here
trickymissfit
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Posted: Thursday, July 07, 2016 - 08:17 AM UTC

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The 17lb's recoil took it all the way to the back of the turret. The British radio sets were always situated at the rear of the turret. To make room for the radio, they had to cut a hole in the rear turret wall and make a bustle extension. Guess they just couldn't find another location for the radio.



Having never seen a 17 pounder in the flesh, I can only guess. It seems the gun started life as a towed piece, and that's the issue. Most tanks and SPG's have less than half the recoil travel compared to the towed piece. There are ways to fix this, but involve a lot of redesign.
gary
m4sherman
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Posted: Thursday, July 07, 2016 - 10:23 AM UTC

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How does that relate to my post?



My error, I was responding to your 4th paragraph, not your 1st one.
Bravo1102
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Posted: Thursday, July 07, 2016 - 11:47 AM UTC

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True, it does not make any sense to us 70 years later, but it is what it is.



It's called engineering during wartime with limited resources, limited time and making it work because men's lives are on the line.

Doing incredible things under circumstances that as Franklin said "a more generous God would never allow."
KurtLaughlin
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Posted: Thursday, July 07, 2016 - 05:35 PM UTC

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Would not have been a little more feasible to cut the rear port out while going thru the machining process. Looks like internal hull mods could have been done in a fraction of the time if they'd been done on the assembly line.



Sure, however the US policy was to deliver standard tanks to Lend Lease. The amount of modifications tolerated to suit particular "customers" was very small.


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Still one has to assume that the tanks sent to England were ear marked for modification before they went out the door over here.



And that assumption would be completely wrong. The process of selecting and modifying tanks for the 17lb have been documented elsewhere.


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I know something about assembling tanks and making them.



There are particular circumstances in this case that may make your knowledge less valuable.

KL
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