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Watertight cylinders (or WTC's as they are often called) are the heart and soul of an R/C submarine. Their main functions are to keep the electronics and battery of your boat dry during operation and to create a means of increasing or decreasing the buoyancy of the model through the use of a ballast system.
View or download Cylinder instructions by clicking on the links below:
Link to BLHeli configuration program download
Original SubDriver Assembly Photo Gallery
Type VII SubDriver Assembly Video walkthrough
SubDriver SAS ballast system description