I was familiar with three of those fighters, but I didn't know anything about the Bristol F.2b so I looked it up. Interesting aircraft, kind of multi-role, not as heavy forward firepower, but has a tail gun and it is fast, almost as fast as a Spad XIII.
It is my understanding that the rotary (engine spins with prop) engines didn't have a throttle?... Mag advance, and on/off switches only...
RC
Yup, that is how they seemed to work. I think the Foker D.VII and the Bristol F.2b both have inline engines though.