B40 FAI max amps?

[Andy W]

I've searched and found a couple of old threads, on where Gordon Tarling (used to carry Hacker in the UK) suggested Hacker themselves had provided setup data where this motor was used at 90A.

I'm wanting to know how far I can push it for 30s and 45s LMR runs. Right now I'm at about 80A (600W on 7 cells) but would like to jump up to about 100 (on better cells and a larger prop). Right now I'm running a 16x10 and you can see the power levels here..

FWIW, I believe this motor came in a 5 and 6 wind version, don't know which I have but it's got the 6.7:1 box on it.
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(posted this in power systems on Jun 27 and got no responses)

879018

[Andy W]

I show Kyna Veatch has logged in and responded since I posted this. Is there no answer to my question?
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[kyna]

Andy,

I apologize for the delayed response. There is not much published information on this motor.

On the B40 FAI w/ 6.7:1, you can definetly push the motor to 100 amps for 45s on a 7 cell. You can go to 100 amps for 30s on 10 cells.

Please let me know if I can be of further assistance.

Best Regards,

Kyna Veatch
Office Manager
Hacker Brushless USA

[tic]

I have a B40FAI/F5F carbon motor that I used to use on 10 cells.. the gearbox kept coming off.. Then the HM-105 was intermittent.. I sent it in to HackerBrushless USA and they returned it with a clean bill of health.(BTW, the gearbox continued to come off under power, I CA'D it myself and it stayed put). The ESC went dead 1 sec. after launch and I destroyed an airframe.. Upon examining the ESC, I found a cold solder joint on a battery lead wire.. the wire had intermittent contact with the board.. I could only determine this by removing the factory shrink wrap.. Something I was told would void the warranty if I did this myself.. I re-soldered the wire and called Hacker brushless USA and told them about the situation. .I was told "sorry, we are still learning"...

[Andy W]

On the B40 FAI w/ 6.7:1, you can definetly push the motor to 100 amps for 45s on a 7 cell. You can go to 100 amps for 30s on 10 cells.

Glad tic posted here, somehow I had missed this response. This is great news - I will be making a pack of Sub-C's that can be pushed to 100A for 30s, so that will make my AVA scoot a little better in Class A..
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[sayno2glo]

I was using 5 turn FAI at 150A in F5D and it survived. If you can check the case temperature after motor run you know. Under 100C is safe. I was at 90deg C..