The following is a quick summery of the 55 Forge. More in depth design and discussion can be found on the site.   The original 55 Forge was bottom blast. The fire shown is a little shallow, so if there is a question, just add more fuel.   The  tuyere was a piece of auto exhaust pipe with 1/4 inch holes to accept 1/4 inch round bar in a X pattern to form a grate. Lots of open room for air to move up and into the bottom of the fire.   The next test modifica