The 705's were ok submarines they had issues the 5 blade screw meant that the screw turned faster to produce more thrust the end result was increased noise, we know from Dr Ballard who worked with SOSUS and discovered the deep sound channel later on that an alfa coming off the north cape at 40 knots could be heard in Bermuda.
Yes their existence resulted in the development of ADCAP however their capabilities have been vastly over stated, as such some realities that have come to light in recent years regarding their design and role.
First off the hull cracking theory which is not true the boats themselves were rated down to only 450m the hype seems to have been bought on later in life by the hunt for red october which shows a fictional alfa class konavalov diving to 900m the truth is the alfa was a much more delicate submarine that we are told.
50 knot speeds again this has been debunked power to weight ratio's calculated by caltech in the late 1990's showed they needed a reactor with an output of around 65,000shp, the single OK550 / VMA40 lead bismuth reactor was unstable especially when running at high or low temperatures the latter resulting in the reactor going solid, on top of that when along side the reactor had to be kept switched on and heated to stop it from going solid this also happened while undergoing maintenance, this meant they were extremely expensive to maintain and operate and as we see now dispose of.
The alfa in practice could for short periods achieve 45 knots but could never sustain this and this is why the much larger and more powerful project 661 anchar (NATO Papa) currently holds the sustained underwater speed record of 44.7 knots again the lone 661 was built using titanium but like the alfa had a maximum operating depth of around 400-450m, this time the submarine was powered by two VM-5 PWR'S as opposed to the fancy lead bismuth design favored in the alfa.
The reason titanium was used for these submarines is because it is a lot lighter than steel it is also a lot stronger and crucially wont warp at high speed high pressure depths.
What we see later on with the development of titanium boats is the slower but more powerful (weapons wise) 945/945A Sierra class these boats are titanium hulled and they do dive very deep maximum operational depth is rated to 850m but they are not as fast as the papa or alfa mainly having a maximum speed of around 33 knots, these submarines look almost similar to the project 971 Schuchka Akula class, its worth noting that one of this class was involved in a collision with the USS Baton rouge the baton rouge suffered severe enough damage that the boat was scrapped while the sierra class Kastroma was repaired and put back in to service, sierra is likely to see a few more years service yet with 2 active and 2 awaiting or undergoing overhaul.
Probably the best titanium boat made for speed and diving capability would be Project 685 Plavnik Mike class which had an operational diving depth of 1020m you probably all know her as K278 Komsomolets speed estimates put her en par with the Sierra class 33 knots the early assumptions of her being powered by a pair of lead bismuth reactors were incorrect the soviet union did reveal that they were PWR's however a lot of the K278 aspects and data remain classified.
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