William_H
Well-Known Member
OP might want to consider a larger box which might be big enough on top to take a small kettle or pot. Connect the chimney to the back or side to leave flat top. As said stainless steel is much worse heat conductor (better insulator) that Ali but a layer of fibreglass mat might also protect cabin top at chimney exit. A gauze of some sort might reduce sparks escaping from the chimney. (really bad for sail material or GRP) If OP has a cooker on board a better idea might be to fit an attachable chimney and cone to above the flame to remove CO Co2 so that longer use and more sealed cabin is safer. A small computer fan might be usable in a long chimney to suck fumes out. I imagine a chimney that went horizontal back to the aft bulkhead made of ali might ensure gas is cooler at exit. Another option might be a venturi type extraction vent with fin to align it to wind. Only good if there is wind.
A ventrui has a large opening into the wind which tapers down (converges) then opens up to a large exit. The area just after the constriction gets a low pressure that will suck exhaust out.
As an example old aircraft had a venturi about3 inch diameter opening converging to 1 inch then out to 3 inches again over about 12inches long. At 80 knots this would produce enough suction to drive gyros etc with 3 or 4 inches (mercury) of vaccuum. consider good luck olewill
A ventrui has a large opening into the wind which tapers down (converges) then opens up to a large exit. The area just after the constriction gets a low pressure that will suck exhaust out.
As an example old aircraft had a venturi about3 inch diameter opening converging to 1 inch then out to 3 inches again over about 12inches long. At 80 knots this would produce enough suction to drive gyros etc with 3 or 4 inches (mercury) of vaccuum. consider good luck olewill