We use Google Groups with email lists for the following subgroups:

- All members (used to share stories, send out invites to club meetings, etc.)
- Board members (used for communications among board members)
- Tow pilots (used e.g. by members to ask if a tow pilot is available if no-one is on the schedule in our online flight log system)
- Instructors
- Ship managers

It's not perfect but works reasonably well.

We have about 150 members in total (just to give you sense of scale)

Hope this helps

Clemens