Your Sub-Tech book will be on it's way tonight. Per Registered Post.
Happy reading, and have fun building👍
Take your time - You'll need it!
Before you take it to the lake-
Test, test, test in the 'Domestic Test Tank'.
Then test it again!
I tested my first sub in the DTT by leaving it underwater for several hours and periodically running the motors and waggling everything that moves.😉
Cheers, Doug 😎