As pointed out above the 7200 needs -0- throttle to initialize... for calibration purposes you can unplug the castle throttle lead and then initialize the 7200 with the throttle endpoints in the TX at 100-100 with the throttle curve 0-50-100... after initialization you can set the endpoints to 30-30 on the throttle and go to full throttle and plug in the castle esc... I hope this information is helpful...
Make sure to re-bind the 7200 after you get the TX calibrated with the ESC...
I like to turn off my trims when I calibrate so they can not get bumped in the future.
This is the best way I have found to calibrate the 7200 with the castle esc :
** Always make sure the blades are off the model or the pinion and main
gear are securely disengaged**
1.) Initialize the 7200 with the RX pack plugged in and the endpoints at 100-100 and the throttle pulled to the bottom... ( Make sure that you don't have 2 Becs plugged in at the same time )
If you are using a BEC plugged into the main lead with the ESC you must remove the throttle wire while the 7200 initializes with the throttle endpoint set at 100-100 and the throttle stick at the bottom.
2.) Once the 7200 initializes change the endpoints to 30-30 and move the stick to the top... Plug in the main power to the ESC.
3.) The Cell count will count up if you have auto -liPo detection set and then once this is done you want to increase the High endpoint until the ESC tones at 100% throttle calibration and then add 2 clicks...
4.) Pull the throttle stick down... and increase the low stick endpoint until the ESC arms... Add 2 more clicks and you are done.
** It is recommended to calibrate the throttle when you upgrade firmware, or go from either GOV mode to Fixed Endpoint mode or Fixed to GOV... Also if you enable or disable the auto enabled feature.**
With the 7200 I would also think after calibrating the -0- throttle you would probably want to re-bind and reset the failsafe for the throttle so you can set it at -0-... Thanks.
You can also see the instructions in the link below...http://www.horizonhobby.com/pdf/SPMA...l_addendum.pdf