Tail holding

[Bunter]

Hi Freaks

I began flying my MT in October last year, my first heli, so am a relative beginner but am now comfortable flying my MT around in FF, nose in hovering and the odd stunt or two (stall turns, loops and backward flips). So I feel I am progressing OK (I doubt I'll ever be able to put in the time to master full on 3d) but one aspect of the MT is really bugging me.

My Mini Titan won't hold the tail when performing rapid pitch changes. If I increase pitch rapidly the tail wags/wobbles out very slightly (to the right so nose left) and then wags bag.

Here is my set up
stock ESC in gov mode with a flat normal (75%) and idle up (85%) throttle curves
stock motor
Revolution 3S 18C 2100mA packs
Radix main blades
K&B tail blades
HS65MG on cyclic
Futaba S9650 on tail
Spartan DS760 gyro mounted between the frames
metal upper mixing arms
DX7 & AR6200
no revo mixing on TX

This gives me a head speed of ~2400 in normal mode and 2600 in idle up.

I have tried the following to try and cure the problem.

Replaced the stock linkage with a carbon rod (less flex)
Removed the grommets from the tail servo so it's screwed directly to the mount
K&B blades
chinese tail weight mods (I really didn't like how it flew with those)
turning up the gyro gain

I also found a lot of slop in my tail coming from my tail pitch control slider which I replaced, but the problem won't go away.

Someone told me that the tails on 450 size helis never hold as well as the tails on larger models, but obviously the 450 size can size fly very decent 3d and so I find it hard to believe they are all like that.

Or are they and am I expecting too much from the tail?

Does anyone have any other suggestions I could try please?

Many thanks in advance

Cheers

Bill

PS - Still loving it though, even with a slightly wobbly rear :)

[ghtracey]

At 2400, I think you're at the low end of the RPM scale for this heli. Does it do this in idle-up as well. Lower headspeed lessens your tail authority. Try jacking up your curved to 85% and 95% and see what happens.

[crabfu]

I've heard most esc's for this size heli don't do governor mode well, so I'd recommend trying it without gov mode. I've never even tried gov, but it sounds like the problem? I run stock esc and motor as well, without gov. If tail wags, turn down gyro. If it doesn't hold well enough, turn up gyro :) My thorttle curves are 0, 50, 80, 90, 100 for normal, 100, 95, 90, 95, 100 for idle up 1, and 95 flat idle up 2. I can't really tell the difference between the two idle ups, and the tail holds solid in all rpms, including my nasty habit of bogging down the motor :)

Hope that helps.

-Crabfu

[Bunter]

Thanks both, that's something to try. Any more suggestions out there?

Bill

[chuckk]

im running a jazz so mine is governed but here's what i notice about my tail....btw i'm running a full cnc tt tail...i constantly need to tighten (barely) the 2 bolts running through the tail pitch lever as these seem to loosen slightly over 10 flights or so. i can feel the play in the lever if i wiggle it up and down. i disconnect the ball link and snug it until it still moves free and doesnt have as much play. tt really needs to come out with a full cnc tail unit so you can loctite these bolts and forget about them. once you rid your tail of this play i increase my gyro gain until it doesnt wag during forward flight (who cares about hover). my tail holds fine until the battery starts getting weak then it blows out.

hope this helps.

[Bunter]

Thanks Chuck, something else to try.

Cheers

Bill

[Bunter]

Just to say thanks all for the suggestions, I upped my head speed and my gyro gain and today the tail held much better.

Thanks again

Bill