attacke (Raspberry) Pi: Cool Stuff
The R-Pi ran hotter as I installed nginx, rvm and other programs. So I had to think again about the fan. My wonderfull Android App "RasPi Check" showed me that the temperature was about 49°C - 52°C as ruby 2.1.0 was compiling. So I had to think about the fan again.
It works as expected, the fan is no longer noisy and it cooles the core temperature down to 28°C - 31°C!
At this point I want to recommend the Android App "JuiceSSH".
"The all in one terminal client for Android including SSH, Local Shell, Mosh and Telnet support."