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Permalink Reply by Vernon Barry on June 25, 2012 at 6:43pm

First, test failsafe with the props off, never the way you just tested. The problem is, if the TX is off, you have no control and thus that spinning blades could have become your worst nightmare. Shame on you and consider yourself lucky. You could have easily determined the functionality with no props and a lot less danger.

 

There is a known "feature" of the PPM encoder that too low of a signal on the throttle while the other channels remain valid or centered results in the PPM continuing to send the last known good throttle signal. Being that you were idling, shut off the TX causing the RX to go failsafe, either the throttle was low and remained low, or the other option was the TX dropped all outputs to zero and the PPM then dropped out so you didn't seem to activate runaway mode, but again, that's why I'm warning you since likely, you are going to be playing with settings and that's a very real possibility. If you hit the magic setting (and trust me, by having it idling and then turn off the TX, that's as close as you ever want to get to the exact situation known to cause a runaway).

http://code.google.com/p/arducopter/wiki/Failsafe

http://diydrones.com/profiles/blogs/spektrum-dx8-and-ar8000-failsaf...

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Permalink Reply by Dustin on June 25, 2012 at 6:45pm

lol... I wasn't foolish.  I put foam props on for the test.

 

I've read both of those links in getting my system setup.  The second link covers how to get the throttle to show a value below the 975us threshhold. 

 

In rereading the other link, it could be that I am essentially triggering the wrong failsafe --- ie. I don't think I need the low throttle failsafe because I have the receiver failsafe working.  I'll look over them again, thanks.

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Permalink Reply by Vernon Barry on June 25, 2012 at 6:51pm

Cool, I just had to look at it that others might not remember that step.

Anyway, hope those links help.

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