[avmich]

Thank you. However, turbine exhaust can't provide much thrust - both flow and speed aren't large. So the spike nozzle doesn't get much thrust from turbine gases - yet it can get it from chamber gases.

[Gravityloss]

Which was not my point. Low pressure turbine exhaust gas serves a purpose. Hence the whole name of the engine, "aerospike".

It's not very important, it's just names. This project is hardly the first one to not distinguish between spike nozzles and aerospikes.