Anechoic Tiles feasible in late 1941

Suppose Germany figures out how to get anechoic tiles on its submarines in late 1941 with the majority adapting the technology by early 1942. In OTL adhesives were the problem, but they were eventually solved ~1944. How does this affect the course of World War II?
 
Probably not a lot. Submerged endurance was too low to make a big difference. Boats still had to charge batteries on the surface until snorkel was introduced (& even then, surfaced was a good idea). You'd cut the dived losses some, but the Brits would develop better sonars (or better hydrophones); perhaps they'd go with a "surface PUFFs"? Perhaps a passive homing torpedo is introduced sooner?
 
In 1941 it would probably not have changed a lot. Even if in 1940, at the height of the battle of the Atlantic every German U-boat had anti-sonar tiles fitted, they would still be just as vulnerable on the surface and still suffer from convoy escorts carpeting the whole area with dept-charges as soon as some lookout sees a periscope. It would take until the introduction of the 'modern' type XXI and XXIII u-boats in 1945 to actual have a use for anti-sonar devices. And even then it would just spark an arms race with the Allies to develop better sonar.

What really doomed the German u-boot campaign were 1) The limited underwater speed and range of the type VII and type IX 'diveboats'. Spending the majority of its voyage on the surface, the u-boots were still prone to detection by long-range patrol aircraft, aircraft from convoy escort carriers and convoy warships.

2) The interception of the U-boot communications. Not only the breaking of the Enigma code but also what we today call the metadata: Who is calling when and from where. Once the British had set up their chain of listening posts they were able to at least rudimentary triangulate the position of every call and give advance warning to the convoys nearby.
 
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