The RS 12 (GR) is a new modification of the legendary RS 12 spiker
it has the same looks as the F variant which i terminated it completely
the GR has a new jet engine nozzle providing a cool look to it
so
i will try to automate the nozzle to be movable as well later
enjoy
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the nozzle on the back of the aircraft retract once the engine at high throttle creating a littile bit of stream lined speed
once the engine is at idle or at low throttle the nozzle begins to extend creating more airflow to go through between the extended pistons holding the nozzle flaps making the cold airflow mixed with hot air of the engine reducing the heat on the engine for a bit
that's my general idea towards it