 compar analysi perform long rang hyperveloc vehicl compar analysi perform long rang hyperveloc vehicl long-rang hyperveloc vehicl studi term motion power flight motion aerodynam heat unpow flight power flight analyz ideal propuls system close approach present-dai rocket motor unpow flight character return earth ballist skip glide trajectori trajectori treat yield maximum rang veloc power flight aerodynam heat treat manner emploi senior author studi ballist missil naca tn 4047 except radiant well convect heat transfer consid connect glide skip vehicl ballist vehicl effici type studi sens gener requir highest veloc power flight order attain rang disadvantag offset reduc convect heat transfer re-entri bodi artific increas pressur drag relat friction drag - blunt bodi kinet energi requir vehicl power flight reduc minim mass coolant materi involv glide vehicl develop lift-drag ratio neighborhood greater 4 superior ballist vehicl abil convert veloc rang disadvantag heat convect compens advantag heat main radiat atmospher consequ mass coolant materi low skip vehicl develop lift-drag ratio 1 4 superior compar ballist glide vehicl convert veloc rang lift-drag ratio 1 equal compar ballist vehicl lift-drag ratio 