Ken, This is exactly what I am referring too. The thickness of the "honeycomb" is determined by the required burning rate. If the charge was powder, the velocity would be too high and blow up the gun. If the charge was solid, the velocity would be too slow for a good shot. What if the charge was alpha-bits or cheerios cereal shaped? look at all the cereal shapes, how about chex shape for a fast burn? Let's think in 3 dimensions. Let's not forget the ignition surface too. Little ridges ignite easily. You need a primer to light a charge. Dan Dimiduk - Gasification List Archives: http://www.crest.org/discussion/gasification/current/ Gasification List Moderator: Tom Reed, Biomass Energy Foundation, Reedtb2@cs.com www.webpan.com/BEF List-Post: <mailto:gasification@crest.org> List-Help: <mailto:gasification-help@crest.org> List-Unsubscribe: <mailto:gasification-unsubscribe@crest.org> List-Subscribe: <mailto:gasification-subscribe@crest.org> Sponsor the Gasification List: http://www.crest.org/discuss3.html - Other Gasification Events and Information: http://www.fsec.ucf.edu/bioam/ http://solstice.crest.org/renewables/biomass-info/gasref.shtml http://solstice.crest.org/renewables/biomass-info/