Streamline Engine - Neutron PlasticStreamline Neutron Engine Fasten your seatbelt, because the Neutron Engine is now available all year long! With flight numbers of 13 5 0. 5 2, the Engine is built from the ground up to be a reliable workhorse driver. Higher power players will see the Engine stand up and cruise down the fairway, while average power throwers will get shorter, straight flights with a reliable finish. One thing you can be sure of is that the Engine will fight to stay on