Bill,
On researching the Weber carb it seems it was originally developed to
provide different chokes, one for low rpm and one for high rpm.
That would be good if we had siamesed PP with different sized runners -
sounds complicated.
George ( down under)

The single throat for each housing is ideal for reducing complexity and limiting energy loss.

 

The Webers with multipal throat sizes are for econemy at low speeds on the street. Very effective, and Ford and GM licensed the Weber DMSA-100 carb (one 23MM choke and one 27MM choke) for the Pinto and the Vega. Of course the Americans redesigned that carb instead of just buying it, and both were useless. Too many cooks you know..........

 

There is little need of a strong mid range for aircraft use. The airplane is stuck in 2nd gear in effect by the reduction ratio. The prop loads build exponentially with RPM so, you need best power by 6,500 or 7,000 RPM tops, and best torque around cruise RPM. A big deal for a piston engine, nothing at all for a rotary if it is cooled and oiled properly.

 

Lynn E. Hanover