Chapman realised that better flow characteristics (and therefore more power) could be achieved with an 8 port head, but lacking the resources to have one made, he reversed the port functions and de-siamesed the old inlet ports.
查普曼意識到，使用8端口頭可以實現更好的流量特性（因此更多的功率），但缺乏製造一個的資源，他改變了端口功能並消除了舊的入口端口。