Hello, I am working on a 1/19 scale Boeing 757-222. I am Using 2 "FMS 80mm 12 Blades Ducted Fan EDF With 3270 KV2000 6S Inrunner Brushless Motor" And the engine diameter is 12cm. So Of course there's going to be a gap in between the outer shell of the engine and the edf. And I Notice Ramy RC Had...