I will start off with my usual disclaimer, there is a lot of Crap out there in U-Tube land !
If you are not familiar with Swedish Candles, Goto -> www.youtube.com/atch?v=_SRDTUqZtRE
-Here we are showing that as the Candle burns, the individual cut channels add surface area and also act like mini chimneys to draw in combustion
air, and the wood sections by their close proximity help insulate and retain the Heat Energy of the initial fire, allowing for the release and final
combustion of the wood gases!
Because there is no combustion chamber to further insulate AND heat and channel the flow of the hot exhaust gases we get a smoky fire, putting a
cold Cooking Pot on top of our Swedish Candle further 1) disrupts the air flow patterns and 2) Cools the hot exhaust gas !
In the horizontally fed Rocket Cook Stove, we generally use small finely split and very dry wood which is supplied with its on air supply via a channel
underneath the wood !
-Here the combustion chamber is insulated often only with sand, or dry dirt, and is often 2'' or slightly smaller in diameter and the wood fuel is
burned very cleanly,most of the fire is isolated to the tips of the wood fuel in the heat of the combustion chamber. Combustion temperatures and
number of BTUs of heat energy can easily be controlled by the operator by the amount of fuel fed into the flame edge of the combustion chamber!
The J-Tube style Rocket Mass HeaterRMH, uses the force of the draft created to draw the Fuel Air mixture downwards through the flame front of
the soon to become red hot combustion chamber, and from here Time, Temperature and Turbulence occurring throughout the Burn Tunnel, and
Heat Riser complete the combustion of our wood gases in our Hot Exhaust stream!
Again, the small size of our wood and the frequent air channels acting as chimneys will actually first cool our fuel and the deliver the wood gases
cooked out of our fuel into the combustion zone!
-Here again the owner/operator can quickly bring up the internal temperatures of the combustion chamber to achieve maximum burn efficiencies
(Greatly reducing the overall amount of wood that must be consumed) and then control the amount of BTUs of Heat Energy by controlling the
amount of wood fuels fed to the fire, often finding it necessary to use a brick on top of the feed tube to balance out he Air Fuel mixture. Learning
this trick comes early and with experience as the operator learns controlling the fire by listening to the internal 'roar' of the RMHs Happy Dragon!
I hope I was able to pass along the mental pictures I have in my head and am trying to share ! For the good of the Craft !
Think like Fire, Flow like a Gas, don't be the Marshmallow ! As always your questions and comments are Solicited and welcome ! Big AL
Success has a Thousand Fathers , Failure is an Orphan