Jay C. White Cloud wrote:
So my conclusion is that a wooden frame gives the cob wall more strength.
Excellent conclusion and empirically very true. Take the time to examine, study and understand some of these building styles. each one is often heavily augmented and or comprised of some form of cobb. This will assist you greatly in further understanding these modalities and their history.
Dhajji Dewari Construction
Koti Banal Construction
Peruvian quincha construction
bahareque or taquezal construction
There are many more, but this should provide you a strong foundation of understanding.
If you can find retire fishing and shipping rope this is very good to tie things together further strengthening the wall matrix.
You many also consider that one of the infill layers be of a "light cobb" mix...what many today are calling "clay straw slip forming" or "ramming." This is a clay "soup" mixing with mainly straw or wood chip that will not hold together fresh yet when "rammed" in to the wall against a form and allowed to dry creates a matrix that has higher insulative values than just cobb alone. Working in concert with both systems gives you a thermal mass wall and also an insulative wall made of very similar materials.
I look forward to your further progress.