The HR3 setting on the 7CHP is the same as SR3 in the 9C I quess. There is no SR3 setting in the 7CHP. If you look in the 7CHP manual on pg 61, it explains the different swash plate settings. If you set you CAL-30 up with eCCPM then your running 120 degree swashplate, which is HR3. At the top of that page it also say what type of helo the Cal-30 is. Hope this explains it. Not sure about the belt. Next time I fly i'll take a look at it. Have fun.