I think they use a catamaran now, dont know if this is aswell as or instead of the hydrofoil
Here's some info from the Yesil Dalyan website
JOURNEY TIMES
Departure Time From Fethiye : 09:00
(Passengers Should Be At Harbour At 08:15)
Arrival To Rhodes : 10:30
Departure Time From Rhodes : 16:30
(Passengers Should Be At Harbour At 16:00)
Arrival To Fethiye : 18:00
... Journey takes 90 min.
... Ferry & Catamaran will start operating on the second week of April.
... APRIL - from 08.04 every Tuesday and Friday
... MAY - every Tuesday Thursday and Friday
... JUNE - first week 3 days Tuesday Thursday and Friday
After first week 4 days Monday Tuesday Thursday and Friday
... JULY - every Monday Tuesday Thursday and Friday
... AUGUST - every Monday Tuesday Thursday and Friday
... SEPTEMBER - every Monday Tuesday Thursday and Fri day
... OCTOBER - every Tuesday Thursday and Friday