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HelicopterMain Discussion › heli drifting to the right
07-09-2008 12:13 PM  9 years agoPost 1
mille

rrApprentice

Stockholm Sweden

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Hi,

I have a hurricane 550 and futaba gy401 with s9254 servo.
I have set the gyro in rate mode and I believe everything is by the book. In flight t tail drifts slightly to the right. What could be the cause of this. I have set my gain at 75% now and I have tried to lower and go higher but the tail still drifts. I have also played with the belt so that it is enough tension, but nothing.

Any help or suggestions would be greatly appreciated.

M

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07-09-2008 12:40 PM  9 years agoPost 2
helimatt

rrElite Veteran

Lafayette, IN

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Two things- vibration and sensor out of calibration.

The first: you find sources of vibration on the heli, and play with different gyro mounting options until the drift goes away. Different layers and types of mounting tape, and with/without velcro strap over it.

The second: rare but happens (I had a 401 that did this once), send to Futaba to be serviced.

Never, ever, ever, ever give up.

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07-09-2008 01:15 PM  9 years agoPost 3
Moss

rrNovice

GB

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If it is not calibrated properly then you can do it yourself by switching from HH to Normal modes when it is booting, I'm not entirely sure of the combination but have a rummage, else I expect someone will tell you how on here pretty soon.

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07-09-2008 01:17 PM  9 years agoPost 4
mille

rrApprentice

Stockholm Sweden

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helimatt, thanks.

How do I find the source of vibration, it seems like the whole heli vibrates more or less :-)

Also, the gyro is placed on top behind the main shaft, as per the instructions, is this wrong?

M

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07-09-2008 01:19 PM  9 years agoPost 5
mille

rrApprentice

Stockholm Sweden

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ok so it could be a calibration issue?

Anyone here know how I calibrate it?

M

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07-09-2008 01:21 PM  9 years agoPost 6
Moss

rrNovice

GB

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RTFM

http://manuals.hobbico.com/fut/futm0807-manual.pdf
[Method 2] Rapidly switch the transmitter sensitivity switch between the AVCS and normal modes at least 3 times at a 1 second or shorter internal, then set the switch to the AVCS mode position. The monitor LED flashes instantaneously and the rudder signal is memorized. If the trimmer was moved during flight, the memorized neutral position can be updated to the current neutral position by repeating this operation. When performing this operation, land the model and hold the rudder stick in the neutral position.

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07-09-2008 01:42 PM  9 years agoPost 7
Yug

rrMaster

UK. Herts

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It might be something obvious like some trim or revo mixing.

Vegetable rights and Peace

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07-09-2008 01:45 PM  9 years agoPost 8
mille

rrApprentice

Stockholm Sweden

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my trims and revo mixing are all set at zero or neutral.

M

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07-09-2008 01:53 PM  9 years agoPost 9
Steff Giguere

rrProfessor

St-Eustache, Quebec,​Canada

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Is your tail holding 100% when your gyro is in normal mode. HH is great but tail could slowly creep to one side when your set-up is not 100%.

Team Synergy, Rail blades, Team Scorpion, V-Team

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07-09-2008 01:56 PM  9 years agoPost 10
mille

rrApprentice

Stockholm Sweden

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how do you mean 100% in normal mode?

So that when the rudder is in neutral and rate mode the tail should hold in flight?

M

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07-09-2008 02:21 PM  9 years agoPost 11
junkpilot

rrVeteran

Alamogordo N.M.

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Tail drifting to the right

I think Yug is on the right track, Make sure all of the T/R mixing options in your radio are turned off.
There is an option usually referred to as rudder ofset, The purpose of rudder offset is to take out right rudder when in foward flight when airflow over the vertical fin takes work away from the T/R.
Junkpilot

When you fly JUNK it's hard to tell when you've crashed!

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07-09-2008 02:24 PM  9 years agoPost 12
SNOOPY BC

rrNovice

brighton,mi. usa

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in normal mode, not AVCS, fly the heli. It should hover and the tail should not try to rotate. Sounds like the gyro is having some trouble holding the heli's tail. If the tail is rotating to the left, nose to right, turn the rod end out one turn. It may take another turn if it is out a lot. Put in AVCS mode and try it. If it holds your good. If it still drifts you may need one more turn on the rod end.

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07-09-2008 03:48 PM  9 years agoPost 13
Steff Giguere

rrProfessor

St-Eustache, Quebec,​Canada

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Snoopy Bc answered the question you asked me.

Team Synergy, Rail blades, Team Scorpion, V-Team

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07-09-2008 05:31 PM  9 years agoPost 14
pgoelz

rrVeteran

Rochester MI

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I have a hurricane 550 and futaba gy401 with s9254 servo.
I have set the gyro in rate mode and I believe everything is by the book. In flight t tail drifts slightly to the right. What could be the cause of this.
Did you actually mean the gyro is in rate mode? If so, the drift is because you don't have any revo mix (required for a motionless tail in rate mode). Or are you in fact in heading hold mode and that was a typo?

Easy to tell.... turn everything on, wait for the gyro to initialize, and then rotate the heli slightly. If the rudder servo responds by moving in one direction and then returning to center when the heli stops rotating, you are in rate mode. If the rudder servo responds by moving in one direction and then stays there when the heli stops rotating, you are in heading hold mode.

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

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07-09-2008 08:07 PM  9 years agoPost 15
mille

rrApprentice

Stockholm Sweden

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what I meant is this the setup has been done in rate mode and I fly in HH as the red light is on. So no typo.

Ok so I have tried to turn the linkage in one tunr but that did not fix the problem, still a drift.

Could this be a bad gyro and how can I tell?

M

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07-10-2008 06:58 AM  9 years agoPost 16
SNOOPY BC

rrNovice

brighton,mi. usa

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You need to do all the set up with the gyro NOT in HH mode first. You need to be able to start up take off and hover with the gyro not in HH mode at all. Move the linkage in or out until the tail does not move. Then put the gyro in HH mode and check it out. If you do all this and the tail still drifts a little then leave in HH mode and turn the linkage in or out one or two more turns. The tail should be steady. Tail drift is quite normal if you are hovering in one place for a long time. Most people live with just a very small amount of drift because once the heli is flying around it is not noticeable. However with a good set up it can be vertually eliminated. The gyro, if new or almost new, is probally good. Most people fairly new to the sport all have problems with tail gyro set up. You may have to make many flights NOT in HH mode to get this set up properly. Once done, if you crash or have slight mishap the tail could drift again. You then need to do the set up all over again. Remember you need to do all this in very calm wind. Any wind will effect the tail. If you do need to set up in a very light wind make sure the heli is headed directly into the wind. The 401 should have the delay in 0. The switch should be in N not in D for your gyro. Make sure you have full travel in both directions and the servo not binding when at full travel. In normal mode, NOT in HH, the rate will be about 35. with the switch in HH or AVCS the rate should be about 65. these can change some but this will be close. If the tail waggs all the time in HH mode the rate is a little high. Good luck, you should look in the Helifreak web site at the finless Bob tech room. In there are a lot of good set up and build vidios. In the 450se vid he sets up the 401 with the futaba 7. (if he hasn't changed it)

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07-10-2008 08:53 AM  9 years agoPost 17
pgrbff

rrVeteran

Piemonte, Italy

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In all cases with my helis it has been a question of mechanical set-up.
I set the pitch of the tail blades so that with the rudder stick at neutral, when you take off in NON heading hold mode, and with relatively little wind to affect the machine, the tail drift is at a minimum.
If the drift is to the right, you have to adjust the length of the push-rod to change the pitch so that the heli, with rudder at mid stick, will have a small amount of pitch to the left.
Once she hovers with little or no drift in little or no wind, you can revert to Heading hold mode and the drift should be gone.

Proficient at turning cash and credit into smoke and noise!

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07-10-2008 08:59 AM  9 years agoPost 18
mille

rrApprentice

Stockholm Sweden

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So in normal mode the tail should have some pitch? Now it is dead center with the rudder stick in neutral in normal mode with no pitch.

I will try this guys and get back to you.

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07-10-2008 11:36 AM  9 years agoPost 19
JAGNZ

rrProfessor

Auckland, New​Zealand

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That's right, you MUST mechanically set up the Gyro for 0 yaw in rate mode. Do this in the Mode you fly in, i.e. Idle Up. That usually equals approx. 4-5 deg of tail pitch.


Jason Greenwood

www.3dheli.co.nz

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07-10-2008 11:41 AM  9 years agoPost 20
pgrbff

rrVeteran

Piemonte, Italy

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The tail needs sufficient pitch to stop any drifting when NOT in heading hold and with little or no wind and the stick at centre.

Proficient at turning cash and credit into smoke and noise!

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HelicopterMain Discussion › heli drifting to the right
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