2 mail list exist (at least), one in english and the other in french. These are great places where many informations and ideas are exchanged. If you have a passion for the water Rockets topics, then don't hesitate and subsribe to this list.
To subscribe on the english mail list, which was created by Clifford Heath (many thanks Clifford), but now ported on Yahoo!groups, send a mail to email@example.com , without anything else.
More details on http://docs.yahoo.com/info/terms/
You always have the possibility of unsubscribe you, just send a mail to firstname.lastname@example.org
To subscribe on the french mail list, send a message to FuseesAeauemail@example.com , without anything else. You can also go to the site http://fr.groups.yahoo.com/group/FuseesAeau/ and will know all about this mail list.