The 910 kv is most likely a bit high for the 5 cell and the 9x6 prop. You are most likely overheating the ESC. You need to get down to about 800kv plus or minus about 25 for the motor. You could lower the pitch and spin it faster or put a smaller prop on it and spin it faster. At 70% you are on the edge anyway and like motorman said running it on the ground is not usually advised. Put a 6 or 7 inch prop on it for a ground test run and it will most likely not shut down . When I do ground run ups I always use a much smaller prop than my fly prop. Your set up is pretty much what we use on a 4 cell battery not 5. Hope this helps some. You could post your setting for the Talon if you want, Many of us her could look at them and see if something is drastically off but I have a feeling it is going to be close.

Dave knows all about the over amp sensitivity or lack of it!

Success!!! OK, I call CC and they confirmed what I thought about over current on start-up. I then did a no load run-up with the same settings and it run up all the way and held for the full 10 sec test (this is what I use for all ground tests). I then hooked up my CC link and put all the motor parameters to medium and set the current cut-off to "normal" (had been on very sensitive).

Put the APCEP 9x6 prop on and out to smoke test. This time it spun up smoothly and to full rpm no problem, held for the full 10 sec test run time. I do have a BAD ASS 2320 x 820kV on order but for now will de-pitch the 9x6 to maybe 4.5 and give it a go for some short flight tests. I also ordered some of Inova8tive's 10x4R wood props (they are in the multi rotor accessory area on their web site, several sizes 10" is the minimum diameter). I can cut these down and re-pitch as needed (wood props can be heat pitched just as you would an APC, only need to heat soak a minute or so before twisting).

UPDATE:  I found a setting in the ESC for the current cutoff that allows a soft which cuts rpm to allowable current level or a hard cut off that cuts the motor. I had the ESC set for soft so that seems to explain why it just dropped down in rpm.

Best,   DennisT

Update: Today I got out for a full test flight. All was set and the weather was holding (was supposed to be raining all weekend) so I figured I would see if I could get the fight in. Flight went as planned, motor start was smooth and solid the whole flight with a clean cut off. No ESC beeps or signals for over current.

Seems the good starting point for any of the Castle Creation ESC's is to set the start spool-up rate and motor start power to medium, current cut off can be set to normal with hard cutoff. This is what I call the Fox 35, 10x6 prop, 5%N superfuel set up, it is reliable, simple and easy to set up.

Best,   DennisT