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T-REX 450 › Tracking comes and goes.
07-13-2008 03:30 PM  9 years agoPost 1
GroundMagnet

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St Louis

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Ok I spin the heli up and on the ground tracking is off, I lift off and tacking is close to on. I flip to an inverted hover and tracking is off I flip a couple of times back to inverted and tracking is on. I land tracking is off, take off and it close again. I fly out then back tracking is on.

Never had this porblem before could a sloppy swash do this? I do have about 120 flights on this swash and there is some rotational play at the grips.

Other then this issue with tracking the Heli is flying rather well.

450SE V2
430LX/12t Running 100% TC
Trueblood dampeners
Hyperion blades

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07-13-2008 03:56 PM  9 years agoPost 2
Stet

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Key Largo FL

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The only thing I have ever seen to cause tracking to change is a bent spindle. It could be only ever so slightly bent. Also, double check your installation of the thrust washers to make sure the big hole is towards the center of the head, and check your radial bearings while you are at it.

I don't think it is the swash. 3D buddy of mine used to say "slop is good" because it acted a bit like expo.

keepin' it real

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07-13-2008 04:13 PM  9 years agoPost 3
GroundMagnet

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St Louis

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Brand new main shaft, feathering shaft, radial and thrust ball bearings also new ball links.

I my self don’t use expo so I wouldn’t want anything acting like it. I know that there is some slop but there has to be a point in time where there is to much slop. Just wondering if I’ve reached that point? The heli still feels tight when flying it but maybe I’m used to it.

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07-13-2008 04:25 PM  9 years agoPost 4
The_Widowmaker

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Bear Valley Springs,​CA

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Sounds like a loose ball. Even if you have checked, check again.

"I'm a Virgin.. I'm just not very good at it. "

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07-13-2008 04:32 PM  9 years agoPost 5
GroundMagnet

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St Louis

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Sounds like a loose ball. Even if you have checked, check again.
Nope, I just check everything from the swash up it's all tight.

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07-13-2008 05:14 PM  9 years agoPost 6
The_Widowmaker

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Bear Valley Springs,​CA

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If all screws are tight (check flat ones behind arms at top of head), feathering shaft straight, grips and thrust bearings correct, etc.... my next guess would be excessive slop, your blades or maybe something sticking or binding at some point.

"I'm a Virgin.. I'm just not very good at it. "

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07-13-2008 05:45 PM  9 years agoPost 7
GroundMagnet

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St Louis

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Well I put the stock dampeners on and did a small test hover in the yard I was able to get them to track and stay tracked. I’ll get some real test here in a little while.

Thanks everyone hopefully this fixed the problem

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07-13-2008 07:44 PM  9 years agoPost 8
Heli-on

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Southern Cali, CA -​USA

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If the bird's ever been stuffed, the radius arms (plastic part of the lower washout arm) where they connect to the metal is a likely cause. Not so much the plastic, but the hole that the brass collar mates with gets sloppy and unfortunately requires replacing the metal. Seems to be the weakest point of the entire head assembly.

Check every screw on the head, too. One loose ball link is all it would take.

-Gregg B.

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07-13-2008 08:34 PM  9 years agoPost 9
Boidman (RIP)

rrKey Veteran

The Home Stretch

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Average over a bunch of new 450's seems to be:

If you stand a tape measure or ruler up next to the trailing edge of the main blades and twist the grips just enough to bump against the ends of the slop (which is somewhere shy of moving the servos) in both directions, the trailing edge will travel a little short of about 1/32".

On some new models, the slop was over 1/16". There have been a few measured after many hours of flight, getting real close to an 1/8", but still reasonably flyable, just with much less precision. Slop up around that 1/8" most often causes major problems.

Maybe try the twist test, looking for an indication that you may have missed something between the servos and grips.

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07-13-2008 09:14 PM  9 years agoPost 10
shuttlepilot

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Mullins, South​Carolina

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It sounds like everything has been covered by previous posts. The only other thing I can think of is have you checked the blades bolts and the blade holes? The bushings in the blades can get slightly elongated and cause some issues.

I haven't had blades go in and out while in a hover, but I have had them go in and out of track in fff and some basic aeros. Ended up changing out the blades and all of the tracking issues went away.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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07-13-2008 09:24 PM  9 years agoPost 11
GroundMagnet

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St Louis

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Well it was definitely the dampeners, put the stock ones back in and tracking stayed dead on. Time to order some new Truebloods dampeners.

This is the first time with the Hyperion blades I like the way they fly but the do make it bob more in the wind and it’s pretty windy here right now.

Thanks for all the help guys.

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T-REX 450 › Tracking comes and goes.
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