That's good information.
I was getting ready to order one today? I was planning on running a 20.5x15.5 or the RASA 20.2x16 on my Black Magic VF3 for F3A. I have put the order off several times, cause I can't get any real motor comparisons to make up my mind. All the data I have found "suggests" the Hacker will turn (A60-7S-V2) up to a 22x12 @ 74 Amps on 10S setup?
I have a Pletty EVO 30-10 in my other VF3, if the Hacker is as strong as that motor, I have no doubts about using it. My motivation in using the motor is to find a good inexpensive alternative setup for guys wanting to move to a 2 meter bird without all the costs of outfitting, etc.
The A60-7M-F3A is a very close relative of the A60-7S-V2 and the data for that motor is on Hackers webpage,..translate it to English unless you read German.
Let me know what you find out,..I think you will be fine running the 21x14. I would guess you will be around 6000 RPM's, only one way to find out.
PM AJesky or Flyboy91 as he is running one in his proto type Asiris 2m, reports are the motor is very strong.