Electric Stunt > Gettin all AMP'ed up!

ESC Brake

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linheart smith:
After over 100 flights using my JMP timer to control RPM, I decided to take Deans advice and try Governor Mode (actually it is set to Heli high).  I like it so far BUT now I cannot get Braking at all, even though the software on my laptop says the ESC is set to Hard braking. Should I be on Heli Gov High/Low?  Is there another parameter which needs to be set to get braking while in one or all of the Heli modes?


Linheart

 

Mike Palko:
Linheart,
   If your using a CC ESC the break is disabled in governor mode. I assume it is the same for all brands, but I can't be sure. If you read the CC instructions it tells you under throttle type that the break is always disabled in governor mode. Its been a while since I programed my ESC, but I think a hard cutoff will give you a quick prop stop w/o a break. It also depends on the motor cogging. 
   This was a problem (or could have been a problem) for Bob Hunt at the worlds. Maybe Dean can elaborate on that topic......
   

Kim Doherty:
Linheart,

"Brake" mode is used for aerobatic aircraft. It can range anywhere from mild to wild. Even stopping a propeller from 9000 rpm to zero in less than a second generates tremendous torque. So now think about what would happen if you were in a helicopter that had Brake mode enabled and the pilot engaged it! The rotors would leave the hub, silence would envelope the cabin, you would rapidly see more ground than sky, autorotation procedures would seem moot. (we leave this picture at this point as it is not nice to stare when people are having a bad day)

For this reason, ESC manufacturers will not enable Brake mode and Heli (governor mode) at the same time. Bad for business!

There is nothing the JMP timer processor can do to get around this. It is strictly an ESC function. The CC ESC will not permit this combo.

This spring/summer, Schulze will announce a purpose built F2B ESC that will permit Brake mode with governor mode. It is a totally dedicated Control line aerobatics ESC with advanced governor mode programming just for control line. Stay tuned.

Kim.

linheart smith:
You are right Sir:

I read the CC instructions and it clearly states that Braking is disabled in all Heli modes. 

At the beginning of this project I flew many flights without Brake.  This allowed the prop to spool until the Bearcat came to a complete halt.  After reading the Rules I came to belive that a Control Line airplanes motor Must shutdown prior to landing. 

Will a spooling prop qualifly as a stopped motor? 

Linheart

Alan Hahn:
At least in AMA events, there is no rule that I am aware of that the prop has to be stopped. The "only" thing I see is that "The duration of the flight ends when the model rolls to a stop." (quoted from the rule book for the landing).

I have read that this is different for FAI.

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