cooling system = système de refroidissement
impeller = turbine de pompe à eau
tell-tale = http://en.wikipedia.org/wiki/Tell-tale you mean the sailing definition?
No he means the small Jet of water out the back/side of the engine which shows that the cooling water is flowing. Sometimes referred to as "pee-pipe" or "tell tale".
Yes I did - I think it may be called a 'chute d'eau' which seems to make sense...... Definately not a tell tale on the sail unfortunately, but thanks in any case for the help.
