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HelicopterBeginners Corner › Tail Drifting...?
03-30-2005 11:38 PM  13 years agoPost 1
darkfa8

rrElite Veteran

Brick, NJ - USA

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I have a Hawk Sport with a 401 gyro with 9254 servo, sensitivity at 85%, stock tail blades, all three flight modes are AVCS. I initialize the heli on a work stand, then carry it over to where i'm gonna fly, wag the tail rudder before i put it down, then wag the rudder back and forth 3 times quickly to reset the neutral position. My 7CHF Tx trim is neutral.

The nose of the heli keeps drifiting right in a mild 5mph headwind.

Any tips of what to do to keep the tail locked in?

- Dan Goldstein
Team Revolectrix

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03-30-2005 11:47 PM  13 years agoPost 2
Zephan

rrApprentice

Lompoc, CA

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I have a 401/9254 on my raptor 50 and 90% gain and it locks on well. A few questions:

- This may be dumb, but is the heli spun up. What RPM? Until the TR gets enough speed, the tail will drift.

- Are you sure you get enough throw in the tail blades in both directions? You actually need more for nose right than left, because engine torque will help to the left.

- Are you using the remote or manual sensitivity settings?

- Did you set the dip switch for digital servos?

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03-30-2005 11:50 PM  13 years agoPost 3
BC Don

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Calgary, AB Canada

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Turn off the revo mixing (tail rudder) on the 7CH, let me get mine and I'll tell you where to do that.

Go into the initial screen, scroll down to "B4" (last page), press , set "REVO" to INH.

That should do it for you. Also, if you have a different REVO for each flight mode, inhibit it for all.

Got Money? Send it to me, I'm a Heli Addict.

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03-31-2005 12:02 AM  13 years agoPost 4
darkfa8

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Brick, NJ - USA

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A HAH!

BC Don, thank you! lol....

I just pulled my Tx over here ...

I had been running the following:

Flight Mode / Gyro Mode
Normal / Normal
Idle-Up 1 / AVCS
Idle-Up 2 / AVCS

In Normal Flight Mode / Normal Gyro Mode I have Revo: On, HI - 5%, Lo - 10%, for Idle-up 1/2 Revo: OFF

Well, as it turns out I hadn't turned Revo OFF for Normal Flight Mode since changing the gyro to run in AVCS for ALL Flight Modes...

I'll turn the Revo: INH now lol and I'll go from there but I anticipate that'll help imensely.

Zephan, I don't know what my head speed is. It hovers at half-throttle (at) +5* . I don't have a tach yet to check the actual RPM.

I set the ATV on the tail rudder servo to maximize the mechanical range of the tail rotor before binding.

The gyro switches are setup correctly. Since the Revo was ON in my Normal Flight Mode, I just reset all the gyro sensitivities in the Tx to 100% so I can start there and back down as needed.

- Dan Goldstein
Team Revolectrix

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03-31-2005 12:05 AM  13 years agoPost 5
Zephan

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Lompoc, CA

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Yup! The revo mixing on would do it. Inhibiting that should do the trick.

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04-01-2005 02:20 AM  13 years agoPost 6
allns47

rrKey Veteran

Richmond IN.

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atvs do not adjust control throw on a gy401,,it only tells the servo how fast to turn..The pot switch on the gyro adjust the throw...

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04-01-2005 03:01 AM  13 years agoPost 7
darkfa8

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Brick, NJ - USA

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I just sorta figured that out...

My ATVs were a bit low...

So I set them to 100% on the Full Left/Right and then adjusted the Limit pot on the gyro so there was clearance at the extremes for the pitch slider on the tail rotor... tail rotor now moves lightening quick and doesn't bind...

After all this tweaking I'm anxious to get out and fly it, but it's supposed to rain tomorrow

- Dan Goldstein
Team Revolectrix

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04-01-2005 12:24 PM  13 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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After all this tweaking I'm anxious to get out and fly it, but it's supposed to rain tomorrow
Don't feel bad, every time I finished a build or major mod last summer we had a hurricane come through. I figured if I put floats on something it would stop.

Andy
AMA 77227
http://www.jaxrc.com

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04-01-2005 05:13 PM  13 years agoPost 9
BC Don

rrElite Veteran

Calgary, AB Canada

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How much rain? I've seen folks flying in rain standing under an awning so that the radio gear stays dry. Wrap the Rx, battery and gyro in baggies and you should be good to go in light rain.

Anybody try this? When it rains here its cold as well so I'm not too keen on trying it. You guys out on the Wet Coast of Canada get involved in wet weather flying? I'd imagine you'd have to otherwise you'd only be able to fly 1/2 the year , at least here I can fly in snow.

Got Money? Send it to me, I'm a Heli Addict.

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04-01-2005 05:34 PM  13 years agoPost 10
Scooterpilot

rrKey Veteran

Southern, California

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Gyro Gain
Zephan

90% is very, very high gain to run. That's hard on the servo.

I have a 401/9254 on an Evo .50 and in idle up 1 and at 54% it locks solid. In normal at 60% with a low head speed, it locks great.

Just my 2 cents

Two G-4's & X50's YS60SR,Futaba 18SZ/12Z/14FG, ,Rail Blades Rep

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04-05-2005 01:28 PM  13 years agoPost 11
Zephan

rrApprentice

Lompoc, CA

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Scooterpilot
It probably would lock at a much lower gyro gain, but shouldn't I run the gyro gain as high as possible without getting tail wagging?

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04-05-2005 02:14 PM  13 years agoPost 12
BarracudaHockey

rrMaster

Jacksonville FL

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http://www.futaba-rc.com/team/team-tip-002.html

Happy reading.


Scooter, don't forget without knowing servo spine to ball distance gain is just a number, although I agree thats high.

Andy
AMA 77227
http://www.jaxrc.com

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04-05-2005 02:45 PM  13 years agoPost 13
Zephan

rrApprentice

Lompoc, CA

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barracudahockey/scooterpilot,
Thanks for the input regarding my gyro gain. I was setting the gain based on "as much as possible without tail wag". It appears that the latest rule of thumb is to use only "as much gain as necessary for the most demanding maneuver".

I think I will go back down to 50% gain and only work up from there if I find the tail not holding. I've only progressed to a hover/simple forward flight stage, so I probably won't need to increase the gain until I get into some more drastic flying.

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HelicopterBeginners Corner › Tail Drifting...?
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