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Old May 22, 2014, 06:17 PM
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Joined May 2014
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Help!
SK450 RTF kit problem - Extreme noob

Hi Guys,
This is my first post and my first purchase of a multirotor. I purchased the Hobbyking SK450 RTF kit. I have multiple issues but the main one is that the quad sways off, veers sharply and never holds one position.
I could not take off straight even 1 single time, as opposed to all the videos I see of the quads taking off.
I have been talking to HK customer support and they were good but didnt help in resolving the situation. One of them asked me to make a video and upload so that someone could help me out.
I have attached the pictures of all the settings on the KK2.0 board.
I have gone through vast number of videos and posts to tweak the settings.
One thing I observed was the motor configuration setting had some weird motor layout (see last pic), I then reset the board and it was showing X configuration again.
Finally I also have the video of the test flight one of which is the best that I could get out of this kit. Videos are not allowed here so here is the link for the same.
testflight (0 min 12 sec)

Edit1: Forgot to mention I upgraded the board to 1.6 version by Lazyzero.

Thanks for reading and any help is much appreciated.

Edit2: the last pic of the messed up motor configuration is just for reference, I have already fixed that thing as written above in the post. Just repeating so that people dont think that is the problem.
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Last edited by rahuln77; May 22, 2014 at 09:00 PM. Reason: Adding software version
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Old May 22, 2014, 06:22 PM
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Made in Austria's Avatar
United States, NV, Las Vegas
Joined Dec 2013
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There seems to be a motor layout problem (see your last pic) which is causing your problems, it's completely messed up. As if someone messed with the mixer editor. I'd reset your KK board, which should fix your problems. Write down all your gain settings before you reset it. You will also need to select a new/clean quadcopter X motor layout, and a recalibration on a leveled surface after the reset.


This is what a normal X motor layout looks like:

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Last edited by Made in Austria; May 22, 2014 at 07:43 PM.
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Old May 22, 2014, 08:54 PM
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@ Made in Australia,
You are right, the last pic of the messed up motor configuration is just for reference, I have already fixed that thing as written above in the post. Just repeating so that people dont think that is the problem.
Do you see any issue that why it would sway?
Thanks.
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Old May 23, 2014, 01:31 PM
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Joined May 2014
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This is what I heard from the HK product specialist.
It seems to be a gain settings issue, the gain settings are not specific numbers and it changes for every install. You set them per the manual. Since it is wobbling, you have too much gain and need to reduce it by 5% or so and try again
Me: is this the only issue
yes... the drift issue I see, is just a lack of flying experience and control... Lifting off is easier of you start at 1/8th throttle to get the motors spinning and the quickly advance to a littl ov er 1/2 throttle to lift off the ground quickly. This will escape the ground effect I see causing excessive drift when fiting off

I will try this over the weekend update the post.
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Old Jun 09, 2014, 07:18 AM
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Joined Jun 2014
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I'm considering this kit from HK and was wondering if you have any other comments on it?

It will be my first quad not counting the $30 bug I crashed enough times to ruin in a short time. I thought I would pull that out and fix it but it looks like I binned it during a cleanup.
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Old Jun 17, 2014, 12:27 PM
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United States, OH, Fremont
Joined Dec 2013
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rahuln77
Are you still having problems with this quad? I too am a relative noob. I too had serious problems with it. It wanted to fly forward/left while spinning. It had serious stability and drifting problems. My questions to HK kept getting picked up by the Sales staff but not forwarded to Tech support [:-( . Here's what I learned:

1. Unless you're carrying extra weight use the 8045 props.
2. These PI settings work pretty good for me.
Roll/Pitch
P gain 50
P limit 100
I gain 25
I limit 20

Yaw
P gain 50
P limit 20
I gain 46
I limit 10

I set the Yaw I gain to 46 because it still wanted to spin CW after setting the Receiver Test rudder to 0. Depending on if it spins raise or lower the I gain starting with 50 as your mid point. If it gets worse you've gone the wrong way. Make sure you are out of ground effect to eliminate turbulence effect.
3. It's also not a bad idea to check the Receiver Test page each time you fly it. My settings keep drifting on me.
4. I recommend keeping the stick scaling the same on all except the throttle. Start at about 30. As you get experience flying it bring those values up by 5 or 10 at a time. Don't bother with the D/R switch on the Tx, it's not hard to adjust the stick scaling on the KK board. The only way the D/R switch would be useful is if someone else with more experience wants to fly your quad also.
5. If you use Self-level try these settings:
P gain: 65
P limit: 40
Check this video out for a great explanation of Self-leveling:
KK2 Autolevel Tuning and Explanation (3 min 13 sec)

If it wants to drift forward/back (pitch) or side to side (roll) adjust the ACC Roll or Pitch trims to correct. You may only need to correct it by a few increments. If it gets worse you've gone the wrong way. Do these adjustments on a windless day or inside. One warning: do not engage Auto-level in flight, I did it once and scared the hell out of myself. It looked like a spinning toy top just before it hits the ground, only much, much worse.

With the 2200 batteries I'm getting about 8-9 minutes. Recently I tried flying with 3300 3s and 4500 3s batteries. Getting about 12 min. on the 3300 and over 15-18 min. on the 4500. Motors aren't heating up with the larger batteries. These times are only approximate as I may land to check out settings or crash it and have to walk to retrieve it. I haven't tried the 1045 props with the 4500 battery yet, that's next.
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Old Jun 17, 2014, 06:58 PM
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United States, OH, Fremont
Joined Dec 2013
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Quote:
Originally Posted by whitty82 View Post
I'm considering this kit from HK and was wondering if you have any other comments on it?

I got this one and it's quite a bit more challenging to fly than a micro or mini quad. So far its gotten hung up in a tree (low enough to retrieve with a long pole and a step ladder) and broken all the props that came with it. Now I'm waiting for replacements. HK is somewhat slow getting their shipments out and delivery is even slower. When you make orders with them make sure all items you order are in stock, if they aren't the whole order is held up until the back-ordered item is restocked. It seems that the only way to get Tech supports attention is to request an RMA. It took me over 2 months to get help from Tech support instead of Sales support. Be advised !!!

You do need to consider what kind of flying you want to do:
1. Lazy day flying without video or FPV
2. Lazy day flying with video or FPV
3. Full on FPV while racing all over the place

For #1 the SK450 will do the job nicely. Some people consider it low end but it's something that can be upgraded/repaired to your hearts content. The Tx is, to put it charitably, low end. No idea of what kind of range it has. If you're not happy with the Tx/Rx get the BNF version of the quad and go from there. If you don't mind a steep learning curve go with the Frsky Taranis Tx/Rx. It's a very good value for the money. The 2200 battery will get you about 8-9 minutes, a 3300 will get 13-15 minutes (not sure yet) and a 4500 will get you 18+ minutes. The KK is relatively easy to program. The ESC's should be flashed with the SimonK firmware for better reliability. Once it's dialed in it's a stable flyer. Dialing it in is the challenge. I've crashed it into a solidly built park shelter shearing off the KK mounting plate (the crash dome did it's job and protected the FC) and broken all of the supplied props. Made repairs and it's still flying. I'm more concerned with getting it hung up at the top of a tree when I loose orientation.

If you want #2 this quad doesn't have a whole lot of room for FPV gear. You would be better off with a DJI F450 style of frame (it has a little bit more room) or a "dead cat/reptile" style of frame.

If you want go FPV to tear around the sky, through the trees and parks while getting a serious case of vertigo (FPV goggles) get a smaller quad or hex. Check out this link for the third type of flying:
https://www.youtube.com/user/BlackoutTheDrunk/videos
He pilots a 250 H quad and a 290 Hex that will amaze you. This is what I should have done instead of the SK450... Don't get me wrong, the SK can move out but it doesn't have the size and maneuverability of the smaller multirotors.

I have a Wltoys V222 and to be honest I have more fun flying that around then the SK450. I feel more connected to the v222 than the SK right now. Just don't forget, this hobby will suck the life right out of your wallet. Broken props, broken motors, broken arms, burned out ESC, another quad, broken marriage... No, not me, I'm single.
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