Satamax Antone - sorry i probably wasent clear. i appreciate your help very much!
what i meant was is rmh is a stupid proof stove. just put the wood and forget for an hour and a half. or is it has to be maintained every 15 minutes.
allen lumley and Peter Berg - thanks. i'm trying this things and your comments are assuring me that i'm not far from the result people get all over.
Peter - i tried the p channel. i couldn't tell the differens.
about the manifold - by your equations we are ok. meaning i believe the gap around the riser is big enough for the smoke profile to pass.
so manny variables.
tomorrow we are going to build another one. people here like these dragons. hope i wont create fals expectations for them.
thanks again to all of you