Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Tony,

Some nice boilers you got there, I especially like the look of the horizontal boiler.
Interesting consept with those heat exchanger pins on the boiler plate, does this not give more resistance and turbulence in the flue gas channels ?

Optimal flue gas stream depends mainly on the density difference between the hot gas from the burner and the cold surrounding air supplied to the to the fire box.
If there is no cold air due to a closed fire box then there will be limited flue gas flow, independent from the combustion air supplied through the burner.

Excessive flue gas in the firebox will cause poor combustion of the gas.

Could the lack of cold air supply cause some of the issues you are expirencing ?


Regards,

Maurice