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Old Dec 09, 2012, 02:53 PM
Stop me before I build again!
United States, NY, Albany
Joined Sep 2012
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Quote:
Originally Posted by yarg View Post
My quadrotor yaws slightly to the right, but only when applying thrust. It's slight enough that it doesn't really effect things too badly, but enough so that I have to stop and correct the direction I'm facing as I'm practicing.

Any idea what's causing it? I admit, my props aren't balanced, but I'm not sure if that would be enough to cause this.
If your frame is at all flexible this will happen.
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Old Dec 09, 2012, 06:16 PM
It's Just a Hobby!
Sudsy's Avatar
Joined May 2012
865 Posts
Quote:
Originally Posted by yarg View Post
My quadrotor yaws slightly to the right, but only when applying thrust. It's slight enough that it doesn't really effect things too badly, but enough so that I have to stop and correct the direction I'm facing as I'm practicing.

Any idea what's causing it? I admit, my props aren't balanced, but I'm not sure if that would be enough to cause this.
I am copying this from another thread I watch and just commented on.

I hope I can explain this.

On my quad if I remove the food container that I use for a cover I can turn my quad upside down and rest it on the prop spinners. Do this on a flat surface like a table. Rotate each prop and see if the blades remain parallel to the flat surface. Try to adjust as needed to assure that all props are directing their thrust in a pure downward direction. If one if the motors is tilted to the left or right it will induce yaw in the machine. I have two Turnigy Talon frames and the motors become misaligned even after just a hard landing. I must keep a close eye on this and have found this to be a problem with those frames.

Sudsy
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Old Dec 09, 2012, 06:20 PM
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zenman's Avatar
Joined Jul 2012
62 Posts
unequal prop thrust

Quote:
Originally Posted by yarg View Post
My quadrotor yaws slightly to the right, but only when applying thrust. It's slight enough that it doesn't really effect things too badly, but enough so that I have to stop and correct the direction I'm facing as I'm practicing.

Any idea what's causing it? I admit, my props aren't balanced, but I'm not sure if that would be enough to cause this.
I have been having tha same problem off and on (yawing, pitching, rolling, or droping and arm) and was having a hard time figuring out the source of the problem. So I built a little test rig that shows me the thrust of a prop. Checking at full throttle I can see that thrust values can vary greatly even on brand new props, sometimes even up to 30% or more.

The props I have been buying are cheap so I guess you get what you pay for.
I have been using these because I tend to break alot learning acro.
But having unequal lift doing acro probabably contributes to my crashes.
Maybe some of you can suggest a good source for props that are not too expensive

In the meantime I have been experimenting making the prop thrust even by twisting the props a bit. Having good results with this so far.
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Old Dec 09, 2012, 06:31 PM
...just an earth bound misfit
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Joined Mar 2010
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Quote:
Originally Posted by srepfler View Post
KK2 on cold wind and sub zero temperature (-5 .. -7 C).
isus se
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Old Dec 09, 2012, 07:14 PM
HeliHarry
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United States, OK, Tulsa
Joined Dec 2006
338 Posts
[QUOTE=zenman;23485546]I have been having tha same problem off and on (yawing, pitching, rolling, or droping and arm) and was having a hard time figuring out the source of the problem. So I built a little test rig that shows me the thrust of a prop. Checking at full throttle I can see that thrust values can vary greatly even on brand new props, sometimes even up to 30% or more.
/QUOTE]

You should also check to make sure each blade of a prop
tracks in the same path as the other blade. A lot of the props
I've bought are not true in their track. One blade will track
higher or lower that the other.
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Old Dec 09, 2012, 07:18 PM
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Joined Jul 2012
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[QUOTE=harrym;23485986]
Quote:
Originally Posted by zenman View Post
I have been having tha same problem off and on (yawing, pitching, rolling, or droping and arm) and was having a hard time figuring out the source of the problem. So I built a little test rig that shows me the thrust of a prop. Checking at full throttle I can see that thrust values can vary greatly even on brand new props, sometimes even up to 30% or more.
/QUOTE]

You should also check to make sure each blade of a prop
tracks in the same path as the other blade. A lot of the props
I've bought are not true in their track. One blade will track
higher or lower that the other.
mostly what I'm finding on these rctimer props is the shape,pitch is not consistant.
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Old Dec 09, 2012, 07:26 PM
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United States, TN, Clarksville
Joined Dec 2011
3,590 Posts
Hello I'm wanting to talk to a kk2 guru on the phone please. I need to be able to get my auto lvl to work. If you know how to program this board please help me and pm me your number. Ill pay you for your help thanks.
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Old Dec 09, 2012, 07:27 PM
It's Just a Hobby!
Sudsy's Avatar
Joined May 2012
865 Posts
[QUOTE=harrym;23485986]
Quote:
Originally Posted by zenman View Post
I have been having tha same problem off and on (yawing, pitching, rolling, or droping and arm) and was having a hard time figuring out the source of the problem. So I built a little test rig that shows me the thrust of a prop. Checking at full throttle I can see that thrust values can vary greatly even on brand new props, sometimes even up to 30% or more.
/QUOTE]

You should also check to make sure each blade of a prop
tracks in the same path as the other blade. A lot of the props
I've bought are not true in their track. One blade will track
higher or lower that the other.
It's not very important to "track" a prop on a fixed pitch rotor system. That is critical in a CCP helo but not so much with a fixed pitch prop. If the prop lays pretty much flat on a table out of the box that should be fine. The little 5 " props on my micro quads are very easily bent and I just gently bend them back. Balance it as best you can. I prefer the scotch tape on the light blade method and keep the tape as far out the blade as possible.Less weight the further from center.

I once had the opportunity to "track" a Navy SH-3 using the flag and crayon method. We marked the blade tips with different color crayons and with the rotor turning 100% and the pilot holding slightly up collective I had to get the flag into position so each blade hit the flag as it passed by. I only did this once. That was enough for me.

Oh yea, we do it with optics now!

Sudsy
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Old Dec 09, 2012, 09:20 PM
HeliHarry
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United States, OK, Tulsa
Joined Dec 2006
338 Posts
[QUOTE=Sudsy;23486095]
Quote:
Originally Posted by harrym View Post
.....It's not very important to "track" a prop on a fixed pitch rotor system.
Balance the blades.
Balance the hub.
Do a track check.

It all leads to less vibration and more efficiency on ANY flying machine.

You don't have to get technical on the track check.
Just put a ruler along the bottom of your prop balancer,
spin the prop and see where the tips track.
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Old Dec 09, 2012, 10:29 PM
Registered User
United States, TX, Houston
Joined Nov 2012
279 Posts
I broke two quad arms with the below settings, can you help me adjust?

The settings worked fine in my drive way...but when i went out to a field; i beleive all it took was a strong gust of wind to send my Quad into an increasingly violent oscillation. i could be flying fine for a minute and then all the sudden it starts with a slow rock/oscillation...and then rocks further and further out of control.

self level
P gain : 30
P limi : 50

Misc
Height dampening : 10
height Dampening limit : 20

P&I
Elevation/Aileron
P gain : 30
P Limit : 100
I Gain : 20
I Limit : 20
Rudder
P gain : 20
P limit : 20
I gain : 20
I limit : 10

KK2 firmware 1.5
DJI 450 frame
750 kv motors, 40A turnigy plush ESC's
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Old Dec 09, 2012, 11:06 PM
HeliHarry
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United States, OK, Tulsa
Joined Dec 2006
338 Posts
Quote:
Originally Posted by urbansniper View Post
I broke two quad arms with the below settings, can you help me adjust?
Here's what I used, Wind Speed: N9/G17 mph. No oscillations on my 392 Quad.

Self Level Settings - P Gain: 75 P Limit: 20 ACC Trim Roll: 0 ACC Trim Pitch: 0

Misc. Settings - Min Throttle: 10 Height Dimen: 10 Height D. Limit: 30 Alarm 1/10 Volts: 100 Servo Filter:50

Axis: Roll (Aileron) 45 100 25 20
Axis: Pitch (Elevator) 45 100 25 20
Axis: Yaw (Rudder) 45 20 30 10

KK2.0 v1.5
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Old Dec 10, 2012, 01:35 AM
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Croatia, Osijek-Baranja County, Valpovo
Joined Jul 2011
389 Posts
Quote:
Originally Posted by helizrnew2me View Post
cool pictures .....
Thanks, it is snapshot from gopro video,
I just putted new gopro firmware and on snow really good video (sharp and clear).
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Old Dec 10, 2012, 05:08 AM
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Upup's Avatar
Ilford,Essex, UK
Joined May 2006
1,964 Posts
Quote:
Originally Posted by helizrnew2me View Post
did you try flashing your new board?i`m afraid to try now ,dont wanna brick another board .especially now that its up and flying again .
Yes with no problems using Lazy Zero tool. I did try it on 1.2 ( as it came with it) but found it hard to tune out the shakes so flashed to 1.5 and it was the difference of chalk and cheese high p type shakes stopped self level works

I still have some more tweaking to do but the weather here in Essex UK has been very windy

Jeff
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Last edited by Upup; Dec 10, 2012 at 07:46 AM.
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Old Dec 10, 2012, 05:34 AM
Stop me before I build again!
United States, NY, Albany
Joined Sep 2012
1,320 Posts
Quote:
Originally Posted by urbansniper View Post
I broke two quad arms with the below settings, can you help me adjust?

The settings worked fine in my drive way...but when i went out to a field; i beleive all it took was a strong gust of wind to send my Quad into an increasingly violent oscillation. i could be flying fine for a minute and then all the sudden it starts with a slow rock/oscillation...and then rocks further and further out of control.

self level
P gain : 30
P limi : 50

Misc
Height dampening : 10
height Dampening limit : 20

P&I
Elevation/Aileron
P gain : 30
P Limit : 100
I Gain : 20
I Limit : 20
Rudder
P gain : 20
P limit : 20
I gain : 20
I limit : 10

KK2 firmware 1.5
DJI 450 frame
750 kv motors, 40A turnigy plush ESC's
Doesn't sound like settings, what's your battery situation?
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Old Dec 10, 2012, 06:45 AM
Registered User
Chester, UK
Joined May 2010
457 Posts
Loss of Signal

Hi
I was getting ready to fly my quad and set the aux switch for self level. After setting
up I disconnected the battery and was surprised to see no backlight on the lcd.

On checking further I discovered there was no signal from the RX.

I have swopped the RX,checked ALL connections and diconecceted the aux from both board and rx..

It starts with a beep and red light flash then just reverts to safe mode with no backlight.

Any ideas please
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