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Other › Newbie SetUp Help With Logo 10 -HELP!
04-30-2004 08:42 PM  13 years agoPost 1
snsn

rrApprentice

NJ

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I have my logo 10 built acording to the book, everything seems fine.
During my test spinups, the tail wants to spin hard to the right.
No matter how much left trim I give, it still wants to spin completely to the right.
No way to control it.
Tail Slider and servo horn are at 90degrees

Set up is :
aveox - 36/30/1.5
Future 18.46K
GY240 ( HS-81)
HS-85
12cell -NimH

Any suggestions?

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04-30-2004 10:35 PM  13 years agoPost 2
rscamp

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Ontario, Canada

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Yup. Make sure your gyro sense isn't reversed.

Rob

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04-30-2004 10:37 PM  13 years agoPost 3
snsn

rrApprentice

NJ

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Tried reversing the gyro and no effect.

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04-30-2004 11:39 PM  13 years agoPost 4
rscamp

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Ontario, Canada

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If you are an experienced pilot and know what you are doing perhaps you just have a faulty gyro or servo. If not...

Are you in HH mode?

Do you have Revo on or off?

Is your gyro mounted with its axis of sensitivity parallel to the rotor shaft?

Rob

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05-01-2004 02:31 AM  13 years agoPost 5
snsn

rrApprentice

NJ

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I've tried both modes on the gyro.
Revo = Off
Gyro is mounted correctly.

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05-01-2004 04:10 AM  13 years agoPost 6
Saint728

rrProfessor

Honolulu, Hawaii

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Are you tail blades spinning in the right direction? Maybe your belt is hooked up the wrong way? Don't know what else it could be if it isn't that? Maybe you need to reverse your rudder servo?

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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05-01-2004 04:26 AM  13 years agoPost 7
rchaas

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Tulsa, OK

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There are two sense or direction issues to check. Both were mentioned in separate posts, above. However, I thought i'd mention how to check both of these. If you are experienced, and have already done this, then sorry for being simplistic.

First, you need to make sure that a rightward rudder stick input gives a rightward tail blade deflection. There are a variety of ways to look at the tail, but what i do is put the tail blades vertical, and look at the forward (trailing) edge of the upward pointing blade. The forward edge of that blade should deflect in the same direction as the stick deflection. If not, then you need to reverse the rudder channel.

The other thing to check is gyro sense. With the heli and receiver turned on (and gyro connected), rotate the heli rightward. Does the tail respond with a leftward tail blade input? If not, then you need to reverse the gyro sense direction.

If both rudder and gyro sense are correct, the problem lies elsewhere. These are the first things to check, however. And of course, as the previous post suggests, the tail needs to be spinning in the correct direction before you check anything else.

Robbie

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05-01-2004 06:41 AM  13 years agoPost 8
EvoFlyer

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Newbury Park, CA

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Make sure you have the tail blades on right. The ball link must lead. The leading edge of the tail blade toward the ball link. Look at the pictures in the manual carefully.

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05-02-2004 03:53 PM  13 years agoPost 9
snsn

rrApprentice

NJ

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Thanks for all the suggestions.
I've eliminated all the above and found teh problem to be the tail rotor NOT getting enough pitch control.
Servo (HS-81) travel, seems to be working fine.
Servo arm and tail rotor lever are at 90.
I almost got it up to a hover, but it was too unstable as it kept turning right again.
The tail rotor linkage seem OK, but I'm not really sure.
The manual doesn't have any measurements to follow.

Need more Suggestions!
Thanks

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05-02-2004 04:11 PM  13 years agoPost 10
Saint728

rrProfessor

Honolulu, Hawaii

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I would use a regular size rudder servo or at least a 20mm servo arm if your not getting enough tail blade movement.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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05-02-2004 05:03 PM  13 years agoPost 11
Davo

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London, UK

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During my test spinups, the tail wants to spin hard to the right.
No matter how much left trim I give, it still wants to spin completely to the right.
If the tail is spinning to the right (i.e. nose goes left) you want to input RIGHT trim, not left. Remember you are steering the nose, not the tail.

Also what is your headspeed like? If it's too low, then the tail will not have much authority and may max out on pitch without giving sufficient anti-torque to stop the heli rotating. Maybe consider upping the headspeed (increase throttle curve points/decrease pitch curve points) and see what happens.

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05-02-2004 05:51 PM  13 years agoPost 12
rscamp

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Ontario, Canada

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Good idea about the servo arm length, Patrick. The guidelines for arm length are in the manual.

Good thought on the headspeed, Davo. He "should" have enough headspeed with that setup. I suppose the governor could be set too low.

It is hard to diagnose at a distance. I'm sure we'll slap our foreheads when we figure this one out.

Rob

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05-02-2004 07:06 PM  13 years agoPost 13
snsn

rrApprentice

NJ

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I truly believe the head speed is enough.
The problem is when I increase the speed it want to sping left, too quickly, so I can't keep increasing the speed.

Yes, I realize which way to add trim, but it's having no effect on controling the tail spining around.
Just as adding full right, does not correct it

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05-02-2004 08:27 PM  13 years agoPost 14
snsn

rrApprentice

NJ

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I tried a bench test and watched what's happening to the tail blades.
When I initialize the system, I see the tail rod pushes the rotor lever all the way to its end point. And stays there.
It doesn't center.
If you give left or right it goes in each direction, but not a lot.
This is the problem.

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05-02-2004 11:50 PM  13 years agoPost 15
HeliDezz

rrNovice

Fredrick MD

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Sounds like the gyro is bad or the servos is no good.

Could be alot of things making it do that.
When the gyro is in HH it will stay in one spot but will move left and right.
Also the Servo horn mite not be in center.

HeliDezz

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05-03-2004 05:14 AM  13 years agoPost 16
JKos

rrProfessor

Redondo Beach, CA

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> Also the Servo horn mite not be in center.

HeliDezz may have it here. Put the gyro in rate mode and make sure the servo arm is centered with the rudder stick centered. You will also need to properly set the Limit pot as well once you get it centered correctly.

- John

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05-04-2004 09:54 PM  13 years agoPost 17
snsn

rrApprentice

NJ

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Well, I've got it straghtened out.
But I'm not sure how.
Tail is very solid now.
I also had the LHS trim it out.

I had a test hover and it was very nice.
Thanks for all you help!

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