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Titanium used in R/C is pure and unpure if you would like to call it.. it's Titanium Alloy. Most titanium alloy is grade 6Al-4V, it's the same grade 5 alloy Hardcore Racing uses as well as I use and a few other companies who make titanium alloy parts from. It is much heavier then aluninum alloy 7075 that's used in aftermarket parts or 6061 for stock aluminum parts. How much heavier? , I won't get into the mathatics involved in calculating the weight of them.
I design and make titanium alloy chassis, and the only way I can make the chassis lighter then stock, to make many holes in certain areas to reduce mass but keep the intregrity there, atlease stronger then the aluminum alloy chassis coutnerpart it replaces.
But for a CVD, the Titanium CVD I see probably is made also from 6Al-4V and it occupies about the same volume as these aluminum CVD but much stronger then aluminum. If you ask me I would still opt for titanium cvd over aluminum simply for the fact that aluminum compared to titanium used in the drive train is like comparing jello to metal.
6Al-4V is 6 part aluminum and 4 part valenum, ack can't spell, the rest is different alloys and titanium. As long as there's other metals with the aluminum, it will be heavier then just the aluminum alloy. And in this case, we're talking about titanium alloy 6Al-4V grade 5 which is NOT in majority filled with aluminum.
Best Regards,
Larry
F4i Modelsport Racing