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10-15-2005 06:35 AM  12 years agoPost 1
Campbell Grant

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UK

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Hi

I have managed to get my blades to track to about 1/4 inch.

I bought some broad flourescent orange and green strips to replace the Align tape. What discovered is that 1 turn on the coarse linkage causes the tracking difference to go the other way. When I used the fine adjustment, 1 turn gets the tracking to about 1/4 inch. What I need is the ability to do 1/2 a turn, but that is not possible due to the ball link design.

Any ideas. Ca you use ball links from another heli?

Many thanks

Campbell Grant

I HAVE LESS HOVER THAN THE BOVER

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10-15-2005 06:54 AM  12 years agoPost 2
jack726

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Cerritos California

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You can do a halve turn. It is just slightly more difficult to install the link. After it is installed it will work perfectly.

Jack

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10-15-2005 09:05 AM  12 years agoPost 3
Tmaster

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TX

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Hope your not using the yellow plastic blades, I heard they don't track very well.

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10-15-2005 09:49 AM  12 years agoPost 4
Campbell Grant

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UK

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jack26

If I only do 1/2 a turn, then the ball link will not be correctly installed. The manual clearly indicates the the "A" moulded into the link should always face the outside.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-15-2005 09:52 AM  12 years agoPost 5
Campbell Grant

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UK

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Tmaster

Yep, they are the 325's.

I am going to try and figure out a way of having a simple incremental adjustment on the tracking.

Will post any ideas.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-15-2005 12:36 PM  12 years agoPost 6
Gary Hoorn

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Annapolis Maryland USA

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Camjpbell,
I don't believe any competent Heli flyer will use those plastic blades on a TRex. They do not work very well. As to the tracking go back to the links connecting to the blade holders (A), get out your calipers and set them both to the exact same length. Any adjusting up there gives you non-linear response in the air. Do your tracking adjustment on the long lengths (D) from the swash and use half turns if necessary. Ignore what the manual says about half turns. It is done all the time. Whle hovering identify which blade is closest to being perpendicular to the mainshaft and adjust the other one either up or down to be in alignment. I adjust either or both of mine until they fly equally and perpendicular to the mainshaft. If you built the bird correctly the tracking should come in with decent blades. You don't need to try reinventing the wheel! The techniques to trim a Heli are well known.
Gary

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10-15-2005 12:38 PM  12 years agoPost 7
dkshema

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Cedar Rapids, IA

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If you don't want to go with the 1/2 turn thing, some people remove the ball, give the link that 1/2 turn, insert the ball back into the link, then screw it all down. The links are designed to slip onto the ball easier in one direction than the other. The admonition in the manual insures that you can build the heli and then install the links after it's all screwed together.

If you remove the ball, you still get to put the link on easily, you just have the added inconvenience of taking the ball off, and replacing it to tweak the link.

Otherwise, you need to look at all your linkages -- do they move easily, is there any slop, is the stock head molded crooked, are the blades you are using not straight...the usual suspects in bad tracking.

Dave

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10-15-2005 12:58 PM  12 years agoPost 8
Campbell Grant

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UK

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Dave

Many thanks
If you don't want to go with the 1/2 turn thing, some people remove the ball, give the link that 1/2 turn, insert the ball back into the link, then screw it all down. The links are designed to slip onto the ball easier in one direction than the other.
I think I am missing something. Why unscrew the ball. Why not just pop the link from the ball and just give the 1/2 turn.

I don't mind using the 1/2 turn but I am concerned that the "A" will not be facing as stipulated. Are you saying that it is ok to put the links on so that the "A" can face either way?

My setup was done carefully (with paranoia after my Hummingbird experience), all links measured and I am using the Align metal head and swash. All links are smooth and NO slop.

Many thanks

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-15-2005 01:46 PM  12 years agoPost 9
Campbell Grant

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UK

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Gary

I am sorry I missed your post, only saw Dave's.

Many thanks and I was beginning to wonder about the quality of the 325's, you have confirmed my suspicion. The only thing is though - I am not a "competent heli pilot" - I am only at the stage of begining forward flight - so these blades are the cheap option to crash with. Would you still advise me to go for different blades, ie will good blades help me learn faster?

I have to say that I did build this bird carefully - ALL linkages were measured and the geometry on my cyclic and servos is perfect. My first encounter with ep helis was the Hummingbird CP (in my opinion Century left out a certain 2 letters from the CP in order to more accurately describe the item) so I when I got Rexy I was prepared for the need for a precise build.

I am going to go for the 1/2 turn and I think that this will get the tracking to almost ok.

Will keep you posted

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-15-2005 02:35 PM  12 years agoPost 10
Gary Hoorn

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Annapolis Maryland USA

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Campbell,
I hope I helped a little. I feel sure that a better flying Heli will help you progress faster. Wood blades are relatively inexpensive and often times do not cause as much damage as they tend to shatter in a crash. Don't be in a big rush to go "roaring around the field" but better spend time mastering control of the Heli in all modes of hovering. There is plenty of time for that other stuff. Slow easy figure eights in front of you will help overcome the uneasiness that comes when the Heli faces you and controls become reversed. Soon you will be slowing the Heli as it approaches you and then one day discover that you are hovering nose in in complete control. After that land and go have a pint
Gary

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10-15-2005 06:23 PM  12 years agoPost 11
dkshema

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Cedar Rapids, IA

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As I said, the links are designed to slip on the ball one way. In a normal build, you already have the ball links screwed down. You then pop the plastic link on with the "A" on the outside. The only reason you do this is because it is easier to slip the ball on the link this way, after the heli has been built. If you turn the plastic link around a 1/2 turn, it is much harder to snap on. (Try popping a link on the ball with the "A" on the inside and see how much harder it is to do).

Removing the ball link allows you to get that half turn that you need and the link is still easily popped on. The "A" will be on the inside now, but at least you got that half turn that you were looking for.

Of course you can remove the ball, leaving it in the plastic link, get that half-turn on the link, spin the ball back around, and screw it back on without ever having to remove the ball from the link.

Dave

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10-16-2005 08:07 AM  12 years agoPost 12
Campbell Grant

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UK

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Gary

Many thanks, yes, you have certainly helped.

I have ordered some woodies but I will use the 325's until the
replacements arrive.

Will keep you posted.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-16-2005 08:12 AM  12 years agoPost 13
Campbell Grant

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UK

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Dave

Many thanks indeed.

I had not appreciated the difference in effort needed to snap the ball links into the "reverse" position. I see why you suggest the ball removal method!!

Yesterday, I took all the linkages off the head to double check the lengths. One of the plastic links, the tracking, had split down it's entire length. I have replaced it and am going out to test.

Many thanks again.

Campbell

I HAVE LESS HOVER THAN THE BOVER

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10-16-2005 02:02 PM  12 years agoPost 14
geoff_nwt

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Merseyside England

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Cam
you will find that a different ball link manufacturers do not have a leading edge on the ball links, so you can pop the links on either side, with ease.

Geoff

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10-16-2005 02:11 PM  12 years agoPost 15
Campbell Grant

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UK

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Geoff

R U flying today?

Cam

I HAVE LESS HOVER THAN THE BOVER

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10-16-2005 02:16 PM  12 years agoPost 16
geoff_nwt

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Merseyside England

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No. I might call up for ten minutes, but I'm not taking any think

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