Your main problem is the number of lines for each blade.
Convert each blade into a 'block' (include the pivot point, maybe), i.e.
all the lines for one blade become one entity. you can then select the
block and rotate it around the pivot point.
The command is Block on the command line. you will be asked for a name, so
it could be 'Blade-1', etc. Follow the requests as they arise.
When you have finished, the original blade will disappear. The command
Insert will allow you the insert the block into its original position.
If you make a mistake in the selection of the lines for a blade and you
have made the block, using the command Oops will restore the original, but
use it immediately, not after you have done something else.
Any block, after insertion, can be converted to lines using the Explode
You will need to try it; play with the commands; use the Help system where
you will find almost all you need.