It doesn't have to be technical, anything concerned with model or full size submarines will be ideal. You needn't worry about making yourself look silly, you needn't worry about typing errors or spelling errors, these can all be corrected very easily.
Built something recently? Write a short article about it. Bought something recently...write a review of it. Read a good sub orientated book lately...write a quick report on your thoughts about it.
Guys, Brian needs your help here...no articles equals no magazine, it's as simple as that. If you want a magazine to read, then send Brian something to put in it.