Blue Origin Thread (merged) in Science & Spaceflight Posted April 13, 2017 · Edited April 13, 2017 by Lukaszenko I don't think it's that simple. Reentry vehicles are especially shaped to push the hot plasma away and create a cooler boundary layer between the vehicle and the hot gas. And even then, they use special materials and various tricks to withstand the extreme heat. A grid fin, at first glance, is a smack in the face to this design concept. You're basically asking it to go directly through the hot plasma, and even adding extra surface area for it to impinge upon. I'm confident that using everyday materials such as titanium as a heat shield would be catastrophic. I'm also confident that a grid-fin out of purpose-made reentry material (if even possible) would fail. A titanium grid fin though? There would be no chance.