Hello Mavros
I note every flight and incident on a document (I managed inspection and control department when I was working)
The duration of flight is about 15 mn.
YS175 CDI number 1 : now 199 fllghts new bearing at 155 flights
YS175 CDI number 2 : now 121 flights no change bearing.
The fuel I buy in Meccamo has 6 % oil and 25 % nitro.
Friends of mine add 3 % castor oil. So engine is softer.
http://www.meccamo.com/
Claude