Student mum
I take it you are after a blank paper drawing of a full sized boomerang?
How about if you take the smaller picture above and dissect it into squares in a grid pattern then sketch a larger scale on a bigger grid. You can then use that as a template and cut as many larger sized blank ones you want.
.... did I explain that right or am I totally off base? LOL
Nice to meet you I'm in south east Queensland.