My Ventilo HT18 mast at a lenght of 10.5 m (34.4 feets) weighs naked 9 kg (19.8 lb) and with all the wires around 14kg (30 lb). The mast has a very good stabilty, as they use the same masts for the Ventilo 20.

BTW, wouter this carbon ruddersetup looks nice!

Greetings from Switzerland, lake of constance!