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T-REX 600 › Tracking Issue
01-11-2011 09:20 PM  7 years agoPost 1
Cambo

rrApprentice

Phoenix, Arizona

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I noticed when bringing my ESP back to school in Tucson from Phoenix that my tracking was off when I flew today. Tracking was spot on in phx. It has never been crashed before and has about 40 flights on it. I checked everything over, no cracked ball links or bent components. I adjusted the tracking to get the blades back in line. Took about 1.5 turns on the small upper links to get it spot on again. Hovered for one battery in normal and no problems. Next batt went into idle up did some 3d stuff, no problemo, third pack did some big FFF circuits. What caused this? I have been flying this bird in colder weather lately, mid to low 40's. Tucson is a good 1500ft higher than phx and it was in the mid 60's. Could that really make that big of a difference? What else could have caused this.

Would also like to add that post flight inspections showed nothing of concern.

Thanks
Cameron

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01-11-2011 09:32 PM  7 years agoPost 2
Fnity

rrKey Veteran

Socal - Lafayette, IN

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With no crash damage or anything changing as you said, my guess would be the dampers...

Frank Leyva
Rave, Next-D, Radix
Scorpion Power Systems
GensACE

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01-12-2011 03:47 PM  7 years agoPost 3
Cambo

rrApprentice

Phoenix, Arizona

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Possible, if they are off when I fly again I will switch them out.

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01-12-2011 04:00 PM  7 years agoPost 4
jsenicka

rrProfessor

Eagle River, WI

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check for slop in washout and mixer arms. The bolts can work loose leading to some slop to one grip or the other

Jim Senicka
Team Manager, GrandRC Flight Team

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01-12-2011 05:03 PM  7 years agoPost 5
charliedoane

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Branford, CT USA

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Also check the ball extensions on the grips. Verify they did not come lose when you shipped the heli.

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01-12-2011 08:03 PM  7 years agoPost 6
JOLT

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Baltimore, MD

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If nothing has changed (no crashes, heli hasn't been dropped, or any forces applied to it in a strange way) I would replace the dampeners and regrease the thrust bearings/feathering shaft before turning links.

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01-13-2011 03:13 PM  7 years agoPost 7
Cambo

rrApprentice

Phoenix, Arizona

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Thanks for the replies everyone, all the bolts on the head are tight. I am probably going to replace the dampers with the hard ones and re-grease the spindle next time I go out and JOLT suggested.

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01-13-2011 03:28 PM  7 years agoPost 8
Dr.Don

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Cedar Park, TX -- USA

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Also look for a loose screw on one of the balls.

Dr.Don

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01-13-2011 06:02 PM  7 years agoPost 9
Cambo

rrApprentice

Phoenix, Arizona

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Had some time this morning and installed the black dampers from the kit. Ball links are back to the same length. Tracking seems good. One of the grey dampers was showing some signs of fatigue on the face inside the head block. I am not sure if this was the culprit or not.
Cameron

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01-13-2011 07:21 PM  7 years agoPost 10
Fnity

rrKey Veteran

Socal - Lafayette, IN

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Dampers are usually the problem if nothing else has changed... I have seen guys reuse them over n over with tracking issues and they dont realize how important they are and how fast they can wear(especially the align). I always inspect as I clean at the end of the day and try to catch things like worn links or loose bolts. You can always try the "push/pull" on the grips to check for damper play, easiest way to check them and takes seconds. Simply try pushing one grip down and pulling the other up to check for any play, as you wiggle back n forth everything should feel snug.

I would highly recommend the trueblood dampers, they are a bit more expensive but worth every penny

Frank Leyva
Rave, Next-D, Radix
Scorpion Power Systems
GensACE

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T-REX 600 › Tracking Issue
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