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HomeAircraftHelicopterHelicopter Main Discussion › Head dampers
11-14-2018 02:11 PM  26 days agoPost 21
RM3

rrElite Veteran

Killeen, Texas - USA

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BK479
sluggish around center with these blades
no need to change blades for the feel around center if the feel is good at extreme stick positions... simply change the pitch curve in the TX to be more aggressive at mid stick... you can even increase your headspeed to get snappier response with the new pitch curve. this is a much cheaper alternative to getting expensive fast servos you may not even need.... especially if you where already using them and where doing good with them.

Alot of novice heli pilots seem to ignore the fact that alot of how a RC helicopter feels in the air is determined in how the pitch/throttle curves and the gain settings in the FBL controller are all setup together. All this takes time and patience to setup for what feels good for you...

every model helicopter despite being the same rotor size and using the same headspeed responds differently to identical pitch/curve/FBL settings.

showing a preference will only get you into trouble, 90% of everything is crap...

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11-14-2018 02:34 PM  26 days agoPost 22
BK479

rrApprentice

usa

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The vibe was a blade grip and the t hub

My servos are old Hyperion 20 fmd I need new one I like running lower head speed

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11-15-2018 06:21 PM  25 days agoPost 23
RM3

rrElite Veteran

Killeen, Texas - USA

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If you run lower headspeeds and you want less sluggishness around mid stick you need to change your collective pitch curve to be more aggressive, same with the cyclic... turning down the "expo" for collective and cyclic in the TX also helps.

Only serious 3D heli pilots really ever need super fast servos.

example of straight (standard) vs aggressive collective pitch curve setting in TX:

showing a preference will only get you into trouble, 90% of everything is crap...

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11-16-2018 10:48 AM  24 days agoPost 24
BK479

rrApprentice

usa

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I'll give it a try this weekend I already dropped the expo down to 10 from 15 and it didn't feel like it made any difference

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11-16-2018 07:00 PM  24 days agoPost 25
JuanRodriguez

rrProfessor

The Villages, Florida

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BK479
I'll give it a try this weekend I already dropped the expo down to 10 from 15 and it didn't feel like it made any difference
You may want to try negative expo to liven up the center .... but I would try what RM3 suggested first :...

Been there, done that and old enough to know better.....

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11-18-2018 07:37 PM  22 days agoPost 26
BK479

rrApprentice

usa

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So I dropped the expo down to -5 and feels a little better can now hold it in one spot but I can see the skids are shaking where be for the head was shaking so now I need to figure that out I'm about over spending money and time with this thing it's almost BFH time

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11-19-2018 05:27 PM  21 days agoPost 27
RM3

rrElite Veteran

Killeen, Texas - USA

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if your skids are shaking I got news for you... the Heli simply doesnt like the low headspeed.

ALL of my FBL helicopters will shake below a certain headspeed. to get the shaking to stop I have to change the gain and response settings on the FBL controller.

so change your gain settings to suit the lower headspeed...

keep in mind that if you simply increase the headspeed with the FBL settings you have now, chances are the shaking will resolve itself.

showing a preference will only get you into trouble, 90% of everything is crap...

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11-22-2018 02:41 PM  18 days agoPost 28
BK479

rrApprentice

usa

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So I did that bumped up head speed I don't see the shaking anymore. But I think I will change my esc out from the talon 90 to a new hobbywing 100amp v3 I wish I had a talon 120amp but the 100 will work. And also thinking about looking for another motor maybe a little higher kv like a 1200 Or so I'm running a 1100kv KDE 600 xf G3 now

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11-22-2018 03:58 PM  18 days agoPost 29
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Unless you're doing hard 3D the talon 90 should do fine .

If you want an esc get a HV that way you can go 8S later if you want .

spending time, paying attention

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11-22-2018 06:33 PM  18 days agoPost 30
JuanRodriguez

rrProfessor

The Villages, Florida

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BK479
So I did that bumped up head speed I don't see the shaking anymore.
So now that you have it half way decent , why do you want to keep messing with it ???

Just get out there and fly rather than fiddle farting around !!

Been there, done that and old enough to know better.....

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11-22-2018 06:45 PM  18 days agoPost 31
BK479

rrApprentice

usa

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Its a heavy bird at 7.7 pounds and the esc is getting hot and it feels like it has good power for the first minute and then not that that spunky I think this setup is just to hard on this esc being a 5.5 stretch to a 600 on 6s

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11-22-2018 06:57 PM  18 days agoPost 32
JuanRodriguez

rrProfessor

The Villages, Florida

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Sounds like you may have some setup issues and possibly a battery that is not up to the task.

If you post your gearing and radio settings perhaps one or more of the elec heli gurus can help sort things out .

One thing that leads me to this conclusion is your issue that resulted in you having to add negative expo to “fix” the problem with how the heli is flying at hover . The negative expo is probably just masking some underlying issues ....

Been there, done that and old enough to know better.....

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11-22-2018 07:24 PM  18 days agoPost 33
BK479

rrApprentice

usa

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Batteries are all great shape not that old 2 and 3 omh on each cell .
The only thing that has not been replaced on this heli is the side frames every thing else is new parts except the servos
And I just got done hovering it and the shaking is back I'm thinking it might be the KDS ebar because yesterday it was smooth and today not.
I might try to dig out my old vbar 5.3.4 and see if it does the same thing .

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11-22-2018 10:05 PM  18 days agoPost 34
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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An ESC function/performance remains the same through out the flight. I suspect your batteries are starting to go.

The hot esc can be corrected by using a higher gear ratio.
Sounds to me like you're trying to run too low of a HS for the gear ratio you are using.

Run your headspeed at 2000 with the esc as close to 90% throttle .
You may need to change motor pinion to get it.

spending time, paying attention

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11-22-2018 10:18 PM  18 days agoPost 35
BK479

rrApprentice

usa

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Head speed is around 2300 running 85% straight line curve in 1 and 90% in 2
Batteries are all most new hrb 5000
The pinion is a 21 and the other option I have would be to get the 22 or a higher kv motor

And thanks everyone for your help

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11-23-2018 02:02 AM  18 days agoPost 36
Flyin for Jesus

rrVeteran

Troy, IL. 62294

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2300 HS on a 600 should be well more than enough to be rid of shaking from too low of HS.
I guess you're gonna need to tell us more.
The shake from low HS is really more like a wobbling in a circle like toilet bowl effect. If that is not the problem, then your HS is fine and the dampers too.
Some vibes are the tail fin vibrates at the tip when the head is out of balance.
I guess, describe this shaking in more detail so we can point you the right way.
As for the motor and ESC, give us the full details. KV of a motor doesn't have anything to do with its power output. So what motor are you running and what batteries?

Edit: after thinking a bit, 2300HS with 600 blades is too much for a single 6s pack. Even a strong pack.
I run closer to 2100 with 12s on my 600. I run way lower with my logo stretched to 600 on a single 6s 5000 pack.

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11-23-2018 11:00 AM  17 days agoPost 37
BK479

rrApprentice

usa

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It doesn't look like a wobble or toilet bowl effect the disk looks smooth . the tail fin is not moving can't see any vibration there .
It starts off fine for about a minute and then you can see the skids start to shake that's in normal with throttle curve at 0 30 60 85 100 to keep the head speed up but in idle up 1 with 85------85 I really don't see it shaking. But you can all so see it shaking on the ground on spool down.

Motor is a KDE 600XF G3 1100kv
ESC talon 90
Batteries HRB 5000. 50C
KDS EBAR v2
Servos Hyperion 20 fmd
Blades are KDS 600 and KDS tail blades that are probably funkey

My buddy has the same heli so I'm going to try his blades to see if that is the problem
He is running a quantum 1200kv and a vbar 5.3 and his does just fine .
It could be the fbl unit on mine not right or blades at lower head speed I don't know but I want my head speed to be around 1950 to 2100

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11-23-2018 02:57 PM  17 days agoPost 38
Dr.Ben

rrMaster

Richmond, VA, USA

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Any so-called mast bumping or wobbles should go away above 1550 or 1600. No way it should take 2300 to keep this model settled. Some wobble during spool down is not uncommon and typically not problematic.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-23-2018 03:29 PM  17 days agoPost 39
BK479

rrApprentice

usa

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Yah if I don't get it to do what I want this weekend I will probably strip it out and give it to my buddy for parts I'm tired of messing with it .

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11-23-2018 08:56 PM  17 days agoPost 40
Flyin for Jesus

rrVeteran

Troy, IL. 62294

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Before that, how about a video showing the problem.

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HomeAircraftHelicopterHelicopter Main Discussion › Head dampers
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