Full thrust question..

Kealan

Kealan

Active Member
So when I was flying my s500 today with a 4s 5200Mah lipo and 935kv motors I decided to have some fun and go full throttle a few times starting from just a few meters off the ground. All was well except as the quad rockets upwards on full throttle it goes quite a bit off course, as in doesn't go straight up. I don't expect it to go exactly vertically but what can I do to keep it more 'on track' as it flies upwards?

Pretty sure I had the cog central.. Is it to do with having cog perfect? Thanks
 
Kealan

Kealan

Active Member
Also there wasn't too much wind, I don't think it was much to do with the wind as the quad turned from going straight up almost instantly
 
glowingturnip

glowingturnip

Well-Known Member
PI limits not high enough in the FCB settings maybe ? So that with full throttle from the rx, there's no leeway left for the FCB to stabilise
 
Kealan

Kealan

Active Member
glowingturnip said:
PI limits not high enough in the FCB settings maybe ? So that with full throttle from the rx, there's no leeway left for the FCB to stabilise
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Thanks for the reply, but I'm not sure I understand. If I correct this by increase my P and I values will that not increase the wobble in the quad?
 
glowingturnip

glowingturnip

Well-Known Member
not sure what FCB you have, but the KK2.1.5 has PI limits as well as PI gains. The limits are 'the percentage of motor power that can be used to apply the correction. These should be left at default. For example, a limit of 20 (20% motor power to apply the correction) will allow 80% of motor power to be used for commanding a change in direction from the receiver.'

So in your case, if you had a limit of say zero, and whacked the throttle up to full power, then 100% of the motor thrust would be used to go higher, leaving none for fcb corrections and it could wobble off course.

As the manual says though, best left as default, and I haven't touched mine, but you could always experiment if you're able to set yours.
 
LoneRCRanger

LoneRCRanger

Well-Known Member
You know, after reading threads like this I realize how dumb I really am. When you guys talk in acronyms, iy makes me think "what the heck are they talking about?" And I can only answer with DUH? Are there classes on these because I am mostly lost with the jargon and terminology?
 
Kealan

Kealan

Active Member
glowingturnip said:
not sure what FCB you have, but the KK2.1.5 has PI limits as well as PI gains. The limits are 'the percentage of motor power that can be used to apply the correction. These should be left at default. For example, a limit of 20 (20% motor power to apply the correction) will allow 80% of motor power to be used for commanding a change in direction from the receiver.'

So in your case, if you had a limit of say zero, and whacked the throttle up to full power, then 100% of the motor thrust would be used to go higher, leaving none for fcb corrections and it could wobble off course.

As the manual says though, best left as default, and I haven't touched mine, but you could always experiment if you're able to set yours.
Click to expand...
Thanks I'll look into that. I use the CC3D
 
Kealan

Kealan

Active Member
LoneRCRanger said:
You know, after reading threads like this I realize how dumb I really am. When you guys talk in acronyms, iy makes me think "what the heck are they talking about?" And I can only answer with DUH? Are there classes on these because I am mostly lost with the jargon and terminology?
Click to expand...
Haha you catch on after a while
 
glowingturnip

glowingturnip

Well-Known Member
LoneRCRanger said:
You know, after reading threads like this I realize how dumb I really am. When you guys talk in acronyms, iy makes me think "what the heck are they talking about?" And I can only answer with DUH? Are there classes on these because I am mostly lost with the jargon and terminology?
Click to expand...

haha, it's all a front, I have no idea what I'm talking about either !
 
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