It's nothing new to see, and prolly not worthy of a post, but I managed to whip together the core.
Here's a short video:
http://vid215.photobucket.com/albums/cc ... 23a33d.mp4Yesterday, I took the remaining vermiculite and mixed with some soil from my yard and made the insulated heat riser.
Boy, this thing roared pretty well. I acutally packed the riser WHILE burning a fire in it. The rocket picked up as I added material. I would encourage anyone thinking about building one just for an experiment to
DO IT! It's just FUN--I've been trimming my trees and burning the twigs/limbs green!
This will most likely turn into a BBQ where I will bury the core into the ground to lower the cooking surface.