Hello,
I am Ander, from the Basque Country. I am writing to you because meanwhile I was looking into your web and into your designs I have had one doubt. In your first designs (2018, 2019 and 2020) you introduce « the cobra » in them in order to inject the secondary air. But in your last designs you do not design the stoves with « the cobra ». And it seems that the secondary air injection does not exist in these new designs. I found it strange, becase I though that the second air injection was necessary in these systems in order to achieve better efficiencies in the combustion. I have been looking for some explanation in your web but I have not found anything.
So, that is my question: have you prove that this second air injection is not necessary to obtain a better combustion? Or, am I wrong about the designs and actually this second air injection exits but I am not understanding the operation of the designs? In this second case, I do not know if it is possible to explain me what is the part of the operation I am not understanding.
If you have some proves or analysis that prove the correct operation without « the cobra » it would be fantastic and very useful!
Thank you in advance for your time and I am looking forward to your response.
Ander