HK450GT Horrible Head Wobble

[Tony]

If you read the other thread, you know that I had been running at 100% throttle from day one because I was using a straight curve on the throttle. Well, I fixed that and I'm running 50/70/100. Well, 50% just isn't enough, 70% still has a wobble, but 100% is just like it was.

I will let the video explain better. The tail was not holding today also for some reason. Kept drifting nose left. And yes, I was in HH mode.

HK450GT Flight With Head Wobble - YouTube

 

[Graham Lawrie]

This is the same problem I was having with my 600, mine seems to be speed, and the gyro was picking up vibration.

 

[Tony]

Yup, once I raised the head speed back up, everything went away. Now I have first hand experience with this issue.

 

[Adam]

My hk always had a wobble lol.

 

[Tony]

I'm going to do some more testing on this one. Try more and less pitch, find out when it stops (I'm thinkign 75%) and so on. Just fun doing the testing though lol. Wish my fingers would have worked this way a few months ago!!! Something just "clicked" and Mr. Hover Master went away. I still do a lot of hovering, but it's more for stability testing to see what it's doing. I need a more open space without these trees and power lines on the right and left of me lmao.

 

[Derek]

Yeah, I hear ya about wanting a more open space. I usually do hover tests in my backyard. However, I have privacy fencing on two sides, chain link fence on the backside, and a 10x10 shed on the one side of the yard. It can be a bit nerve racking when the winds pick up because it's not a constant wind...it's turbulent...ups and downs, lefts and rights, forwards and backwards....all without warning. Spooky spooky spooky!!!

 

[Tony]

I think I just need to put some stronger servos on this one, and add some more pitch to it. Right now, it's VERY tame, a little too tame for me and I'm having to run at 100% with no expo. and as you can see, the flips and rolls are VERY slow. It will get there though.

 

[Ken Jackson]

Nice flips Tony. Thought you were going to hold that inverted hover. I couldn't have either with the dirt bike buzzing around. Saw the wobble, that is weird. I have come to realize that a flybarred helicopter doesn't like rolls, loops are OK but not rolls. Compared to my flybarless my flybarred looks like super slow motion. As a matter of fact I crashed my flybarred 450 today doing a roll, just didn't rotate fast enough.

Soon I'll have 2 500's and I'll stop flying that 450.

Ken

 

[Tony]

I just wanted to see what it felt like inverted. It didn't like it at all lmao. I didn't have enough pitch and was almost maxed out. Climbing out of it would have been next to impossible, so I just flipped it back over. And the aileron rolls were actually pretty quick. I will be doing a video on how to better setup the head for faster flips and rolls. Just have to put this helicopter back together. It's down and out and I didn't even crash it lmao. Figures.

As for the wobble, that is just LOTS of slop in the head and a low head speed. An Align head would cure those issues. Plus, I didn't have enough pitch. Only 9.5º. It's at 12º now. Time to have some fun when it's back together hehe.