**5.3 Comparison between spike and jet configuration**

**Figure 15** shows that spike configuration ward off the shock wave from the blunt body nose by 0.01 m were the spike nose faces the maximum temperature by reducing the blunt body temperature by 16.67% from the blunt nose body, this configuration, by its virtue of geometry and nose sizing which are smaller compared to blunt body nose, admit the use of refractory material that can withstands very high temperatures such as zirconium only on the nose of the spike instead of all the blunt body nose, this will reduce the economic cost of the spacecraft design. Compared with jet cooling configuration, the direct interaction between the jet gaze's
