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i-term stair step blackbox line??
#1
What is this? stair step "pitch I term", when i go to 0% throttle "I term" does this but only in pitch forward, the quad goes into a slow front pitch until i stop it. the quad flys fine at all other times. i have another quad very similar to this one and this does not happen...i have tryed ANTY GRAVITY. It only happens when at 0% throttle. AIRMODE fixes this completely,this is not OK with me, because its not right...any ideas, because 2 weeks of this and im thinkin its my FC...??    the second pic shows I term (top data line) in flight regular, its fine, does what it should.
im running betaflight 3.2.3 airbotf4 firmware on a flip32f4.
2400kv emax SE white top motors w/bullet 30a esc
dal tri blade V2 5045 props
215 diatone tyrant
CLI is default except air mode and anti gravity
 
IF YOU AINT' CRASHIN' YOUR FLIN' TO HIGH!!
#2
If airmode fixes this completely as you say, then i'm pretty sure it's a "feature" of the firmware... Probably something to do with iterm being reset at zero throttle if airmode is not on.

A possible fix could be an idle-up mix in transmitter, i.e. setting throttle higher than min-check (by using a mix switch) to prevent the reset.
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#3
(23-Dec-2017, 02:50 PM)fftunes Wrote: If airmode fixes this completely as you say, then i'm pretty sure it's a "feature" of the firmware... Probably something to do with iterm being reset at zero throttle if airmode is not on.

A possible fix could be an idle-up mix in transmitter, i.e. setting throttle higher than min-check (by using a mix switch) to prevent the reset.

i was thinking this last night.... i would agree if i didnt have the same ESC and FC in another quad but a 4 inch , it does not do this at all, and is flying on stock pids and NO airmode.(the one in question is a 5 inch).....yesterday i tryed flashing the same firmware as the 4 inch and it still nose dived at 0% throttle.. 
right now i am doing some more test comparing the two on the bench, and then if i cant find any thing wrong (ESC MOTOR ETC) i have a tyrant 160 with the same fC and ESCs, i am goin to tear it apart and rebuild the 5 inch with these NEW escs and FC and try that...and if it still does it then i has to do with somthing with the 2306 2400kv emax white top SE motors and this esc/FC/PDB/ set up ive been using for over a year with no problems?

 another thing the blackox says is the 2 front motors are at 20-45% and the rear are 0% when this is happening, but if the front motor are running at 45% theres no way the quad should be nose diving..it should be doing a back flip.lol...


thank you for your suggestion, and if this becomes true for this set up, would i tune it with air mode on, i guess i would seeins how airmode will be activated at ALL times..
IF YOU AINT' CRASHIN' YOUR FLIN' TO HIGH!!
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#4
(23-Dec-2017, 02:50 PM)fftunes Wrote: If airmode fixes this completely as you say, then i'm pretty sure it's a "feature" of the firmware... Probably something to do with iterm being reset at zero throttle if airmode is not on.

A possible fix could be an idle-up mix in transmitter, i.e. setting throttle higher than min-check (by using a mix switch) to prevent the reset.

im all good with this now...i get it...i didnt think air mode was that important because i never needed it before...and heres a funny thing, i had to reflash my 180 tyrant and i did it with the same firmware that was on there before, 3.1.0, when i went to fly it, the 180 was doin it too...LMFAO....not as bad but alittle.lol.....???
 
so my question now is, do i tune with airmode or idle up on or off?
IF YOU AINT' CRASHIN' YOUR FLIN' TO HIGH!!
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#5
If i remember right there was a bug in earlier versions that airmode actually never really was "off".

Some people also reported problems at full throttle with airmode off btw, so i'd recommend airmode anyway, and also to tune it in the mode you fly.
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#6
so after weeks of doing stuff and things ("lorie")...i have gottin this thing flyin great..5 inch is so fast...still need air mode no mater what..tryed "throttle up" but its kinda different to fly that way....i have a perfect set up to bring out I-term wind up, so thank you betaflight for all the hard work..if not for you, this quad would be trash.....

i did tune it with air mode off and on and came out with really close pids, so for me air mode is just a way to kept my quad from falling over on 0% throttle.

this quad got me all rapped up and forgot why i fpv, remenber DONT FORGET TO FLY! lol...
IF YOU AINT' CRASHIN' YOUR FLIN' TO HIGH!!
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#7
your quad can behave unexpected when throttle is 0, PID is disabled when airmode is disabled, so your quad can be affected by one or multiple of these factors:
- wind
- off centred CG
- one motor is running at higher RPM than others
- your min_throttle is too low
- angular rotation speed is not zero when you put throttle at zero, so the quad continues to rotate

my personal advise is to always enable Airmode in Betaflight, I really don't see why you should disable it. It's great for your quad's performance.
Don't be a LOS'er, be an FPV'er :) -- Blog - Facebook - Instagram - Twitter - Google Plus
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  • nitro20%
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