Fox James wrote:Hi, thank you for your interest:-)
Luckily for me the photo angle is just causeing an illusion because i have made the sections 6x6” .. feed chamber and burn channel are 6x6” the heat riser has a 6x6”base tapering to a 6” ID round.
I found one 3/4 bag of 2000c castable and I mixed that with my standard 1400c castable, total use was approx 35kg.
There are no visible voids and the iinside looks smooth.
So useing the 124 formula my heat riser only needs to be 24” long making a total length on 32” from the burn tunnel base?
Graham Chiu wrote:Can you mix and match? Have the ceramic fibre at the base of the riser so that it rapidly comes up to temperature, and allows the secondary combustion to occur, and have the upper half of the riser as refractory mass to hold temperature in the riser? So, have a full refractory riser, but just line the bottom half with ceramic fibre.
Fox James wrote:
Generally speaking wood burns best when heated from below and fed air from above, this is achieved when we have a good layer of coals and a good draw of air.
That is fine if you have a good layer of coals, but if you have really hot mass that is holding heat will that be beneficial in anyway or not make any difference?
The same applies at the bottom of the riser, if that is glowing red hot and storing heat will that help second air combust the fuel or offer any other benefits?
I have a feeling that mass would make the rocket more stable and non temperamental but I really don’t know!
Graham Chiu wrote:[quote=Fox James
Graham Chiu wrote:It's hard to beat the entertainment value of watching a fountain of fire hitting a cooking plate in the double shoe batch box rocket stove!
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