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10-11-2005 04:42 PM  12 years agoPost 1
Campbell Grant

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UK

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Hi

Please bear with me on this one!

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 .

Does anyone else have this problem?

What I have done is use the longer linkages and the problem has been remedied. IE I have full control of the tail, but have I missed something?

My gyro is a GY401 and has been set up by a friend with 50% sensitivity.

I notice from doing a search that altering the ATV has some bearing on the piro effect. I assume that piro is the rate of turning? Should I have altered this instead?

I have a FF9, is the End Point the same as ATV?

Many thanks

Campbell Grant

I HAVE LESS HOVER THAN THE BOVER

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10-11-2005 06:17 PM  12 years agoPost 2
steven_couch

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San Jose, CA

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Hi Grant

Don't know if this is your problem but I put my 1st T-rex togeather with the tail spining the wrong way (fliped the belt and put the blades on so that they go clockwise when viewed for the right side of the heli). I went to the longer linkages to fix "the problem". It flew great like this. Did not discover the problem until I built the second T-rex.

Just a thought your problems and mileage may differ.

Steve C

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10-12-2005 07:33 AM  12 years agoPost 3
Campbell Grant

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UK

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Steve

Many thanks.

The tail rotor should spin ANTI clockwise when viewing the bird from the starboard side! IE on the right hand side, looking at the bird tail first.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 11:07 AM  12 years agoPost 4
johandheere

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Brussels - Belgium

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make sure that your ball links on the tail blade holders are leading and not trailing the tail blades

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10-12-2005 11:19 AM  12 years agoPost 5
smoothound

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Lancing, West Sussex, UK.

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I have one set up leading and the other trailing and they both fly the same as far as I can tell so I don't think it matters much. Maybe more important if you are a 3D hooligan though...

Phil

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10-12-2005 01:08 PM  12 years agoPost 6
Campbell Grant

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UK

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johandheere


Many thanks.

I had my links on the trailing edge and I have now changed the setup.

I will post again when I have had chance to test fly.


Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 03:33 PM  12 years agoPost 7
johandheere

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Brussels - Belgium

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do not forget to chrck gyro and servo direction....you will need to reverse them

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10-12-2005 04:26 PM  12 years agoPost 8
Chuckie

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Crofton Maryland

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Campbell,

You did not increase the amount of pitch change on the tail blades with the longer links but you did change the angle of the blades with the servo centered. Problem is in the slider mechanism and links. The balls and links bind at the full right stick position.

If you look at the tail of any Miniature Aircraft you will see how they avoid binding. The TRex tail needs to be redesigned. I think they are working on redesigning the tail slider but I don't know when it will come out. I did see a very expensive slider and tail hub/blade holder setup but it’s more than have the cost of a TRex kit. It looks to give full throw without binding but wait for Align to come out with a replacement.

Here is what I did to get 'almost' maximum movement of the slider. First I used the shorter links on the slider and left about 0.5 mm end play, I didn't fully tighten the screws holding the links on the slider. I also looked at the holes for screws in the slider and if I made the holes larger on the blade side, by using an exact knife to cut a funnel shape, I could get more right stick throw before binding.

Finally, I moved the hub further out on the output shaft to give more mid stick or starting blade angle. This also helped in having a even amount of right and left throw in the blades. Remember you need to have the blades at the proper angle when the Gyro has the tail servo centered. Checking the heli in Gyro Normal mode will confirm the nose doesn't turn for one specific rotor head rpm. I'm also using a ball and link on the servo side of the tail control link. If it does turn in normal mode then adjust the tail servo linkage length not the transmitter trim. You’re changing the pitch on the tail blades with the tail servo centered.

Now go back and check the slider movement by disconnecting the link at the tail servo and while adjusting gyro limits make sure you have max and even throw without binding. In my setup I have a little binding at full right compared to left stick but I have more tail pitch than before.

The tail holds very well and I can have very high piro rates if I turn up the ATV on rudder. Even 100 ATV is very fast.

Chuckie

Please stand by for faster service!

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10-12-2005 04:45 PM  12 years agoPost 9
Campbell Grant

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UK

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johandheere

Many thanks.

I refitted the short ball links but this time so that they are on the leading edge. Centrered the rudder, reversed the servo and gyro and hey presto, ni-on perfect, just need to up the piro rate!

Many thanks again. (Do you haveany tips for getting the 325's to track?

Campnell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 04:53 PM  12 years agoPost 10
Campbell Grant

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UK

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Chuckie

Many thanks.

I will be looking at implementing your suggestions as soon as I get some time. I will need to understand what you are saying re the cutting of the holes.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 05:05 PM  12 years agoPost 11
Chuckie

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Crofton Maryland

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I just made the holes larger on one side so the screw can move up and down. The exacto knife edge is say 45 degrees and I cut a funnel shape by rotating the knife. Get it?

Chuckie

Please stand by for faster service!

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10-12-2005 05:11 PM  12 years agoPost 12
Jcopter

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Los Angeles, CA

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Hey Campbell
How about moving your servo mounted on the boom untill your tail rotor pitch slider is centered on the tail rotor output shaft?
Could maybe help

Jack

Keep "Em" Flying

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10-12-2005 05:24 PM  12 years agoPost 13
Campbell Grant

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UK

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Jcopter

Thanks for your reply but I don't think that you have understood the problem that I have HAD.

The problem was created by me because I did not have the tail rotor ball links on the leading edge of the blades. This in effect caused me to have too little tail pitch in order to hold the bird in hover. If I moved the slider by moving the servo it corrected the problem, but I had VERY little right rudder.

I have now corrected my error by refitting the short links but have connected them on the leading edges.

Many thanks


Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 05:27 PM  12 years agoPost 14
Campbell Grant

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UK

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Chuckie

Many thanks again.

Sorry to sound thick, but which screw are you referring to? Do you mean the screw that retains the ball link to the control arm? If so, why only the one screw and which one do I alter?

Thanks

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-12-2005 08:46 PM  12 years agoPost 15
Chuckie

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Crofton Maryland

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No, the two screws that hold the two links (to the pitch slider) that connect to the two balls on the tail blade holders.

The balls and links I'm talking about in my post are the balls on the tail blade holders and the links that directly connect to these balls.

While a bit over designed note how MA in the Fury uses bearings to connect the blade holders to the yoke (part of the pitch slider mechanism in the trex) using the double bearing assy. As the bolts holding the bearings are out of plane (90 degrees) to the blade holder rotation there can be an extreme amount of throw used with no binding. Go to Plans under ronlund web site and select Fury Extreme, then look for the tail rotor diagram. Part 859-16 is the double bearing assy and it connects to the yoke (120-14) and blade holders (0873-1).

I'm just trying to show how a different design can be applied to the TRex to prevent the binding. Other designs are possible. I think the Rapter uses screws and spacers into plastic so we don't need any more bearings on the tail of the TRex.

Chuckie

Please stand by for faster service!

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10-13-2005 07:17 AM  12 years agoPost 16
Campbell Grant

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UK

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Chuckie

I see what you mean! I had already done all of your suggestions except
the holes. Will be doing these next.

Many thanks for your help.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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