Questions about the Double Shoebox Rocket

[esbjornaneer]

Great!
And as the 'amount of heat to be extracted by the bell' then also is based on weight of fuel (and efficiency of combustion). And assuming that the DSR as a core is as efficient at combusting the fuel as the BBR (do the Testo results agree?). Then the DSR should be able to use the same size bell ISA as the BBR. Is this logic or where am I going wrong?

[esbjornaneer]

I am looking back to your recommendations about air inlets...
Are you running your experiments now with a door and a threashold (like in your red stove) or just glass propped up in front leaving the air gaps of primary 20% + secondary 10% chimney CSA?
If you are using a door how do you close only the primary down to half when it is all hot?

[sksshel]

There is much to like about the DSR concept.  I can help with some experimentation.  

I like that you can see the "rams horns" through a window.  I also like the port being free from being blocked.  

Here is a couple pics of my starting point.  Let me know if I need to adjust.  The secondary air channel is not shown but will terminate halfway into the back of the port. 

I will be using LTGS as the casting product.