Thomas, while there is probably more hydrocarbon (fuel)
being ejected from the combustion chamber ports of a rotary than a non-race
reciprocating engine , I think you will find that its already being
burned in the header pipes - that is one of the reasons for the Rotary's
hotter exhaust. So great idea, but I believe you will find its already
ignited in the 1700F+ temps of the exhaust.
Humm, so if its already ignited, then all we need to do
is shape a rocket reaction chamber shape and get additional thrust......
On the other hand, I think a turbo charger would probably be a more effective
use of that exhaust energy. But, that's just my opinion and it might be
interesting to see if any thrust would result. Monty???.
Ed