@ripper leaves down might look correct, but consider the number of adaptations needed.

For one there would have to be a method of orienting itself upside down.

But also the structure of the nested cylinders breaks open at the top, whereas at the bottom they are nicely nested, which probably works a lot better for a solid fuel rocket!

It's not like those floppy leaves will nicely cradle the flame, there too, the roots are more suitable for this adaptation.

@Riedler @ripper with adaptive pressure i am sure the leaves can get more aerodynamic.

The really difficult transition is the material inside becoming solid rocket fuel and igniting it.