If you are new to this hobby, the following articles may help you through the morass of ideas floating around.
An Article Explaining the Pro's and Con's of Ballast Systems
Establishing Surface & Submerged Trim
Adhesives & Fillers
ADF Pitch Controller Instructions
The WFLY Radio Instructions
All other Submarine Files
An Article Explaining the Pro's and Con's of Ballast Systems
Establishing Surface & Submerged Trim
Adhesives & Fillers
ADF Pitch Controller Instructions
The WFLY Radio Instructions
All other Submarine Files