From the Ryanair website
"We recommend that passengers do not book onward flights on Ryanair services. Ryanair assumes no responsibility for making connections and therefore will not be liable for any losses or expenses arising out of any failure to achieve a planned connection."

I have travelled Ryanair from Dub to Carcasonne (via stansted or charleroi) a couple of times and hated the fact that I had to leave a huge amount of time between flights. If Ryanair are delayed on the outbound flight and you miss your second flight, it's tough cookies. They do state this beforehand and to be fair, seem to discourage the practice.