Most of the rotary engines I know, but I canīt talk about all, had of course a Carburator. The crankshaft was conected to the Firewall and it was not turning. The whole Rest of the engine was turning. With this design it wasnīt possible to connect the Carburator in the way we know it for more modern designs. The Carburator was connected at the end of the Crankshaft, near the Firewall and it wasnīt turnig as well. The fuel Air Mix flows thrue a drilled Hole in the Crankshaft into the Crankcase and from there to the Cylinders.
This gives you a very big Volume between the Carburator and the Cylinders, witch makes it difficult to controll the enginespeed without a big delay.
If you close the Throttle for example, afer a few sconds the whole Crankcase is empied from any Fuel-Air Mixture. If you advance the Throttle, you have to fill that big Crankcase with fuel/Air first. For the engine is running with low RPM now the Air Flow is low as well, and it takes a very Long Time to fill the Crankcase and for the Engine to respond.
The use of Blip switches gives you a better and faster Respond.