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10-12-2005 07:32 AM  12 years agoPost 1
Hyprsmash

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Salt Lake City, Ut

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I am having a problem with the my T-rex just turning counter clockwise. I have ajusted the tail to where it maxes out right stick and it still will not balence out. I am holding full right stick and it still wont stop it from spinning counter clockwise. I dont have a clue on what to do about this..

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10-12-2005 07:47 AM  12 years agoPost 2
poletime

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vic Australia

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Assuming the servo is moving the tail rotor in the right direction, turn your gyro upside down.

That should do it.

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10-12-2005 08:10 AM  12 years agoPost 3
Campbell Grant

rrApprentice

UK

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Hyprsmash

I think you are having the same problem that I have had (assuming your bird is setup properly)

Here is a quote of part of my initial posting: -
In order to prevent the nose of the bird from continually turning to the left I had to use about 3/4's of my right trim. This meant however that the tail pitch slider was nearly maxed out, leaving very little for a right turn. What I noticed is that the plastic arms on the Tail Rotor Control Set, that the ball linkages are screwed to, are bent in towards the boom (about 1mm from being straight), effectively shortening the linkages and reducing the amount of pitch at the mid point on the slider .
Are the arms on your Tail Rotor Control Set (Part HT7001L, Page 9, step 3, number 125 of the manual) bent inwards?

If they are, then using the longer ball linkages will increase the amount of pitch at the centre point of the pitch slider.

It worked for me!

I suppose that bending the arms straight will also cure the problem but I am concenned about breaking them!

Hope this helps. Let me know how you get on.


Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 08:36 AM  12 years agoPost 4
Hellijunky

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Chicago

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they will also do that if you have a twist in your belt,it easy to tell if you do just turn the main blades by hand it shouldnt feel notchy at all,i dont know if that is your problem or not but its real easy to miss with a stock tail case

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10-12-2005 06:36 PM  12 years agoPost 5
Tmaster

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TX

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Reverse the gyro switch, or flip the gyro over like Poletime said to do. You don't need longer linkages; that will just make one way really fast and the other rudder way really slow. Pitches will not be right for the tail blades.
Take your time setting the heli up, and do what the manual says . Put the belt on, blades and grips on the same way the manual says. I have equal tail rotor power both ways, bump you EPA up to a higher percentage to get a quicker responce from the tail.

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10-12-2005 09:16 PM  12 years agoPost 6
Ozydego

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Westerville, Ohio

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Best advice I could give would be to take the tail back apart, and rebuild it following the directions to a T... I rebuilt my tail a while back, but I was like "I don't need the instructions this time.... " Turns out I had the tail ball ends on the trailing edge of the blades, instead of the leading edge, like they are supposed to be...I took the tail apart, rebuilt it like the dirsections said, and when I got to the Leading/trailing point, I had an Ahhah moment... yours could be at a different point.

But Honey, I can't live with just stock.....

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10-12-2005 11:46 PM  12 years agoPost 7
crewchief_432

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Groveland,fl.

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Make sure you are using the small ball links not the long ones. I had the same problem with the upgraded tailpitch slider. I put the stock one back on and still had the same problem. I ended up cutting the ball links down to around 8.5 to 9 mm total leingth. hops this helps some. Crew

Did I do that ???

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10-13-2005 12:10 AM  12 years agoPost 8
poletime

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vic Australia

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Ozydego

That's a good point about the leading trailing issue, I've seen on other posts however that as leading the tail has some stability issues that when changed to trailing the tail is fine. By default (accident) I had mine set up as trailing and it's as solid as a rock.

Hyprsmash

If you turn your main rotor by hand clockwise the tail rotors should turn counterclockwise looking from the right. The leading edge of the tail blades should be obvously be leading and when you move the rudder stick to the right the pushrod should move rearwards. As a last check pick up the heli and move it sharply to eg the left (yaw) and watch the tail servo. It should give a quick correction to the right. If it's opposite, reverse the channel on the radio. If when you spool up and you get a few revs up and it suddenly wants to spin by itself then the gyro also needs to be reversed by the switch on the side or physically turned upside down.

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10-13-2005 12:18 AM  12 years agoPost 9
bo105

rrNovice

Singapore

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Check for mechanical failure. It happens to me in flight. Refer to this thread.

http://www.runryder.com/t207658p2/

Make sure your tail drive gear assembly is working fine.

My Trex also has the same problem except it happens during the middle of a flight and I ended up with a bent boom and stripped main gear. Checked and found the gear linking the belt on the tail drive gear assembly (on main body) has come loose. Have to fix it with superglue and now it's ok.

One way to check is to rotate your main blades clockwise and try to stop your tail rotor from turning. Do not use too much force to stop. If it does stop, fix the tail drive gear assembly.

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10-13-2005 01:43 AM  12 years agoPost 10
poletime

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vic Australia

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After saying this I think I'm going to change my tail setup after reading some interesting things from CHUCKIE on the thread called

"had to use the long ball links on tail rotor".

some good points here.

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10-13-2005 07:06 AM  12 years agoPost 11
Hyprsmash

rrNovice

Salt Lake City, Ut

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Results
I have checked the length on the ends is good. The only thing I found was when turning the main blades clockwise and stopping the tail. The tail will stop with very little effort. The small gear where the belt attaches to the main pulley is slipping. I am not sure if this is supposed to happen.

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10-13-2005 01:42 PM  12 years agoPost 12
bo105

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Singapore

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Looks like you found your problem. What it means is that when your main blade rotates during throttle up, the gear slips resulting in insufficient power from the tail rotor to compensate the force of the main rotor - that's why it starts spinning ccw.

I fix my gear with superglue. Just make sure it never touches or creep towards the bearings.

After this, try not to overtighten the belt when fixing the boom. You can easily stress the gear again otherwise. What I do is rotate the main blades by hand without belt attached and get a feel of the turning action. After attaching the belt and boom, you should not feel any additional load when repeating the action. If the blade feels heavy, you've probably overtighten the belt. However, there should be no slack in the belt either.

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10-13-2005 01:56 PM  12 years agoPost 13
TheX

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Newport Beach, California

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That's a very weak spot in this design. The green locktite works VERY well for this fix also.

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10-13-2005 04:03 PM  12 years agoPost 14
Ozydego

rrKey Veteran

Westerville, Ohio

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Yup.. that pulley and the swash.. man their gluer needs to be fired.....

Bo105 I really like your idea of spinning the blades without the belt on, then with it.... you might feel a little more resistance, because of the tail turning now as well, but it should be pretty much exactly the same.... Very good advice for belt tensioning,....!!

But Honey, I can't live with just stock.....

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10-14-2005 12:11 AM  12 years agoPost 15
bo105

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Singapore

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Thanks for the compliment, Ozydego.
No problem with my swash so far.

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10-14-2005 07:26 AM  12 years agoPost 16
Hyprsmash

rrNovice

Salt Lake City, Ut

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Problem Found

I have found the problem. The main drive for the belt pull was slipping. This appeared to be working just fine but was slipping just enough to make the gyro go nuts... The way I discovered this problem is by spinning the main blades and stopping the tail blades. If the tail blades stop and the main are still moving you will need to replace this part... Thanks for all the help, I am back in the air and flying well...

Steve

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10-14-2005 07:28 AM  12 years agoPost 17
Tmaster

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TX

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nice canopy!

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