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Given how much I see it crack on aircraft firewalls
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I would say that an apple to orange comparison of a sheet metal fire wall of 0 too thin sheet titanium vs a copy thickness of a cast rotor thickness ( most people try to run titanium as thin as possible instead of the same size as the original Steel part trying to maximize the weight saving)
As an A&P in the US, aircraft firewall in the US is stainless steel per FAA. reg. non military
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Plus, isn't titanium insanely expensive when compared to steel/iron?
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which is why I asked why make a steel rotor when you can buy iron ones I would think if you are going to go this route use Titanium and save the weight ( half the weight of steel and all most the same strength ) or Is it to say it can be done.
But it was just a question to see the thinking behind the route taken.