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Nov 12, 2012, 07:15 AM
Registered User
Quote:
Originally Posted by srepfler
THANKS @Lance.

I think it is 8 (6-8 is good for me), did not change limit.

You first need to find hoover spot then you can try finding height dampening spot,
go from 2 and bank left right and increase until no lose of height or slight going up.

HD is just little more throttle proportional to bank angle, it compensate for lose of thrust because of angle.
Awesome buddy!... I'll try that. Thanks so much.
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Nov 12, 2012, 10:40 AM
Registered User
srepfler's Avatar
More self level stability video compilation

KK2 1.5 self level ( Autolevel ) with X666 quadcopter (2 min 19 sec)
Nov 12, 2012, 10:44 AM
Taking care of business
Ho-Jazz's Avatar
Need a bit of advise here. Got my tricopter v2.5 going and flies pretty good.
Kk 2 v1.2. Will hover pretty good and just looking for smooth fpv flight. Problem I have is when I try to get ground speed above say 10mph the front right arm "dips" aggressively. Has not caused a crash, but I know it's not right.
Settings,
Roll Yaw
28 30
100 20
25 47
20 10
Do those seem right to you guys?
Nov 12, 2012, 10:45 AM
Registered User
srepfler's Avatar
Some high wind with quad

quadcopter X666 high wind full flight with KK2 1.5 firmware (11 min 28 sec)


and tested cam result on high wind

X666 quadcopter FPV gopro wind test with KK2 1.5 firmware (4 min 10 sec)
Nov 12, 2012, 11:21 AM
Dixie Normious
Eastcoast78's Avatar
Quote:
Originally Posted by Ho-Jazz
Need a bit of advise here. Got my tricopter v2.5 going and flies pretty good.
Kk 2 v1.2. Will hover pretty good and just looking for smooth fpv flight. Problem I have is when I try to get ground speed above say 10mph the front right arm "dips" aggressively. Has not caused a crash, but I know it's not right.
Settings,
Roll Yaw
28 30
100 20
25 47
20 10
Do those seem right to you guys?
Have you calibrated the ESC's? As for tuning, everyone's well be different. tune it as per normal like from the tuning video on the first page.
Nov 12, 2012, 12:12 PM
HeliHarry
harrym's Avatar
Quote:
Originally Posted by harrym
I'm in the final stages of configuring my first quad. I have the KK2 v1.5, Turnigy plush 25a ESC's. I just did the "throttle range setting" on the ESC's and had to set the KK2 "minimum throttle" to 10 to get all the motors to start together. If I raise the throttle just enough to get all motors to rotate (about 3 clicks) and leave it there the motor that is in the M1 position will speed up a few hundred rpm. I've tried moving all the motors to different "M" positions, but it's always the one that's in the M1 position that speeds up.

Any thoughts!
bump
Nov 12, 2012, 12:13 PM
we dont NEED roads!
AcroFPV's Avatar
Quote:
Originally Posted by harrym
bump
This is normal.

Do not worry about it.
Nov 12, 2012, 01:01 PM
HeliHarry
harrym's Avatar
<subaru4wd>

Why is it normal? One motor is faster than the others!
Could lead to abnormal attitude. Motors should be pretty close to being in synch.
Nov 12, 2012, 01:04 PM
we dont NEED roads!
AcroFPV's Avatar
You forget that the KK2 is in control, not you.

If the board is not PERFECTLY level, it will try to compensate.

This will not have any effect during flight, as if one motor were to speed up and change angle, the board will send signal to all other motors to do the same.

Do your same test, then move the board and watch what the other motors do....
Nov 12, 2012, 01:42 PM
Registered User
Quote:
Originally Posted by srepfler
and tested cam result on high wind

http://youtu.be/Cs5WuEdx-Xw
Nice!!!
Do you mind sharing your KK2 settings as this X666 frame is popular, it'll certainly help people.
It's like you're using NTM 1250kv, right? what about your ESCs?
Nov 12, 2012, 01:46 PM
Registered User
Nexus21214's Avatar

T Copters and excess tail thrust problem


Hi Guys,

I have built several tricopters/hexcopters etc using the KK2.0 board without issue.

I have now built a large T copter https://www.rcgroups.com/forums/show....php?t=1760084, and have an issue that I am unable to solve.

In T copter configuration on takeoff I find the tail want to pitch up first. This can be corrected with some down elevator and once airborn its ok.

I have my kk2 board set up as tricopter as there is no T copter option. If it was in normal tricopter configuartion the motor leverage would be equal, but in T copter the pivot point is always going to be between the front two motors.

I have tried reducing the motor mix setting for elevator but this makes little or no difference.

Also to make matter worse the lipos are in the middle of the front pod, adding to the CofG being off as well, which ideally should be in the middle of the craft, or at least more rearward!

One other question: I get little resistance to the tail pitching up when holding it and tilting/pitching by hand. This is despite a lot of messing with the Pi which is fine on aileron but offers low resistance when pitching forward. I would have thought that front motors should speed up to resist pitching? On suddenly pitching the tail down resistance thrust from the rear motor is good ?

I have also tried altering the mix settings on the kk2.0 1.2 board from as low as 10 to as high as 50 on elevator but it makes no difference ?

Any thoughts or suggestion would be appreciated

Best Regards
Nex
Nov 12, 2012, 01:49 PM
we dont NEED roads!
AcroFPV's Avatar
Quote:
Originally Posted by Nexus21214
Hi Guys,

I have built several tricopters/hexcopters etc using the KK2.0 board without issue.

I have now built a large T copter https://www.rcgroups.com/forums/show....php?t=1760084, and have an issue that I am unable to solve.

In T copter configuration on takeoff I find the tail want to pitch up first. This can be corrected with some down elevator and once airborn its ok.

I have my kk2 board set up as tricopter as there is no T copter option. If it was in normal tricopter configuartion the motor leverage would be equal, but in T copter the pivot point is always going to be between the front two motors.

I have tried reducing the motor mix setting for elevator but this makes little or no difference.

Also to make matter worse the lipos are in the middle of the front pod, adding to the CofG being off as well, which ideally should be in the middle of the craft, or at least more rearward!

One other question: I get little resistance to the tail pitching up when holding it and tilting/pitching by hand. This is despite a lot of messing with the Pi which is fine on aileron but offers low resistance when pitching forward. I would have thought that front motors should speed up to resist pitching? On suddenly pitching the tail down resistance thrust from the rear motor is good ?

I have also tried altering the mix settings on the kk2.0 1.2 board from as low as 10 to as high as 50 on elevator but it makes no difference ?

Any thoughts or suggestion would be appreciated

Best Regards
Nex
This happens with my V-Tail.

I attribute it to the lack of "center" of gravity.
Nov 12, 2012, 01:50 PM
I use smaller props on the rear of my vtail with the multwii board, that seems to help otherwise the tail can be overpowered.
Nov 12, 2012, 01:53 PM
we dont NEED roads!
AcroFPV's Avatar
Quote:
Originally Posted by flitelab
I use smaller props on the rear of my vtail with the multwii board, that seems to help otherwise the tail can be overpowered.
thought about that, but i have since become used to it and have learned to compensate. taking off in auto level mode fixes this issue for me too.
Nov 12, 2012, 02:05 PM
AVR Dude
@Nexus21214 is the distance between each motor the same? They need to be and the centre of thrust needs to be the same as the centre of gravity. Check out this thread for a perfectly symmetrical and balanced T copter. With no self level it takes off like a rocket, flat as a pancake, when full throttle is instantly applied.

https://www.rcgroups.com/forums/show....php?t=1730781