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HelicopterMain Discussion › Tail drift
06-05-2004 02:48 AM  13 years agoPost 1
foo

rrVeteran

Richfield, Minnesota

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This has always done this but its starting to get annoying, i am in HH hold mode and my tail drifts a little bit to the right always (nose to the left) so i have to correct periodically with right rudder in a level hover.... ive tried turing the gain up, dosent seem to fix it, i have to always turn the gain down on windy days to make the tail not shake.... this isnt the end of the world type problem but its annoying, anyone know how to fix this ?

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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06-05-2004 02:51 AM  13 years agoPost 2
Lock-Tite

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Quebec, Canada

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I had that before, fixed it by finding the rudder center, the rod was 1.5mm too long. I turned the ball link 2-3 turns.
So re-adjust in the way it is to stop the drift, either longer or shorter rudder rod.

Frank
Dont forget to bring a clean pair of shorts when flying 3D ;)

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06-05-2004 02:52 AM  13 years agoPost 3
Clayman

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Richer, Manitoba, Canada

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Mine does the same thing Caliber 30 GY401/9253

If U Don't Fly U Don't Try

Trex 600 Pro OS50 Hyper

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06-05-2004 02:54 AM  13 years agoPost 4
foo

rrVeteran

Richfield, Minnesota

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yeah thats what i figured but thinking about the way HH works, the tail shouldnt have to be perfect, the gyro would compensate.... you want the tail to be so it dosent drift in non HH hold mode, but whne you put it in HH mode it shouldnt matter just so long as you get the travel..... but im still thinking about trying it anways i know which way to make the tail obviously if my nose is drifiting to the left i would want to make the tail counter that more... .but i just dont know,........ more suggestions or tell me i am totally wrong someone please

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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06-05-2004 04:20 AM  13 years agoPost 5
TMoore

rrMaster

Cookeville, TN

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Trim the machine as close as you can in rate mode so the heli doesn't drift. Then flip to HH and flip the swtich 3 times in rapid succession. Bingo, the tail is trimmed.

Here is a little tip, if you want to make certain you have found the center of the T/R channel with the trims, use the servo reversing switch and see if the servo moves at all when in rate mode, not HH. If the servo moves at all when you reverse the servo, the T/R trim is out of center.

This makes a minute difference to the gyro but you can see it improve the hold on the tail.

Terry

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06-05-2004 09:02 AM  13 years agoPost 6
poerQwa

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Rotterdam, The Netherlands

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Hi,

All the above mentioned items are related to the mechanical setup and should ofcourse be set before anything else is tried.

2 items i've come across during similar problems are:

1: unintentional trim in HH mode (either trim or subtrim).
2. Engine slightly out of tune (mostly running too rich).

All of my turning tail problems where solved when both were setup properly.

Greetz,

Marc

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06-05-2004 03:39 PM  13 years agoPost 7
iskoos

rrKey Veteran

Orlando, FL

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I would fist check the centering.
Check and see if your tail holds without drifting in NON-HH mode with all the revo mixing OFF.
If it is not then fix it by adjusting your tail push-rod length NOT with radio trim or sub trim.
After that turn the HH mode on and you should be ok. I went through the same thing and it worked for me.

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06-05-2004 03:48 PM  13 years agoPost 8
Paulie

rrApprentice

Waterford, MI

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I'll second that Foo.

Make sure the REVO is off.

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06-05-2004 07:24 PM  13 years agoPost 9
MattJen

rrElite Veteran

UK

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Also to add something else as well,

DOnt start it up until the gyro has set, i did this today, my fault, i was talking to other club memers whilst starting it up, i switched on the tx, then the reciever and immediatly started the hellie before the gyro set itself.

Also i was told to not move the hellie at all even shake the table (if its resting on one) before the gyro sets, as this could mislead it into thinking centre is off to right or left.

Have fun all.

Matt

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06-05-2004 10:12 PM  13 years agoPost 10
Johnny Walker

rrApprentice

Oxford England

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Foo move the Gyro to the front of the Raptor as you may have a static prob or small vibration, i tryed all the stuff people told me and nothing worked so I moved mine as I had some serious drift probs and this cured it. You will have to trim a bit of the pitch arm off or you could make an extension or if you have an RX crash box you could mount it on that. Try the other stuff people have said if that dont work move it.

Above is what I have done and the tail is rock solid. Try it, bet it works for you. John.

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06-06-2004 05:49 PM  13 years agoPost 11
SPB

rrElite Veteran

Athens - Greece

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Hi,

I also had the same problem in my R30V2.
It prooved that the problem was the low RPMs. If your RPM are low then the tail rotor does not spin at the necessary RPMs to hold the tail.

Try to inrease your throttle at the point where you are hovering to see if this cures your problem.

Also check this link on how to adjust your tail pitch correct

http://www.raptortechnique.com/tailpitch.htm


Sotiris
myhelis.com Flying Team

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06-06-2004 06:01 PM  13 years agoPost 12
S_Owen

rrApprentice

Wichita Falls, TX.

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You need to check your trims in "rate" mode. You have to have a well trimmed tail for HH to work correctly in the first place. Don't forget to reset the gyro after trimming the tail.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-07-2004 12:34 AM  13 years agoPost 13
foo

rrVeteran

Richfield, Minnesota

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HH shouldnt need the tail trimmed for it to work i would think.... but mine is trimmed well anyways... it may be low rpm thats possible i dont have a tach i just set my pitch at my hovering point on my stick to 6-7 degrees then give it whatever throttle it needs to fly

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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06-07-2004 01:24 AM  13 years agoPost 14
Toad

rrApprentice

Sandy, Utah

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It will affect the tail in HH, the gyro still needs to "know" where center is, just try not to be bull headed about it. in normal, adjust the rod untill the heli has no drift, with trim centered, do the "flip the switch 3 times" trick
You will be amazed at how well that little 401 will perform when set right.
you asked for oppinions, better to try them than argue them before ya comment.

*****

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06-07-2004 01:28 AM  13 years agoPost 15
Toad

rrApprentice

Sandy, Utah

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the reason it drifts is because when in HH, it stops the tail from moving, then seeks nuetral to keep it there, if it is off in nuetral, it WILL drift thinking it is there. so then you put in a corrective command, the gyro starts all over again. if you would simply take the time to set it up right, you will find that there is less battery consumption and the heli is more stable. just give it a try.

*****

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06-07-2004 02:40 AM  13 years agoPost 16
foo

rrVeteran

Richfield, Minnesota

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thanks due to lack of switches i have my idle up switch doing my hh mode, but i also set the throttle curve, im sure i dont want it out of hh hold mode though but i dont use idle up, i never use it and dont plan on anytime soon, i dont ened it right now, i have my dual rates set to 50 and 100 cuz all i need is 50% cyclic right now... im gonna do some switch switching but i am lacking switches...... i know about the 3 flip reset thing, and yea im gonna hve to make it so i can fly it in normal mode to see if it actually drifts..... its not perfect im sure but close.

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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06-07-2004 03:10 AM  13 years agoPost 17
jag01

rrApprentice

Pennsylvania

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In my older days we use to trim the tailrotor with out the gyro turned on, so the tail didnt move. After that everything else was easy. This way u no the linkage is set correct. So why arent we doing this now?

Keep them blades turning !

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HelicopterMain Discussion › Tail drift
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