Tegheim - Home made 4 rotor Wolvo 142

[rgould]

Given how much I see it crack on aircraft firewalls

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

Plus, isn't titanium insanely expensive when compared to steel/iron?

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.