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Home✈️Aircraft🚁Helicoptere-AlignT-REX 250 › blade tracking???
08-01-2012 06:38 PM  9 years ago
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rpat

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Weirton, W. Va.

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blade tracking???
OK whats the secret to getting the blades to track on this thing? I have been all over the spectrum with adjusting the blades to track and I can't get them together. What am I dealing with here cheap plastic?
trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-01-2012 07:42 PM  9 years ago
NQNA

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USA

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Best is just to get them close. The higher the rpm the better they seem to track. I run 5400 in idle up.. They track.. Come out of idle up and they are out..

Good Luck
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08-01-2012 08:34 PM  9 years ago
PrivateerCncpts

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Killingworth, CT - USA

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Have you crashed? In any case... duct tape the whole skid to a level table to check your tracking. If you have FBL, put it in mechanical set-up mode. Start with the blades off. They don't have to be perfect but they do have to be really close in all dimensions as well as CG. By close, I mean +/- 1mm.
Fire it up slowly and look down the center of the main shaft - you should see no wobble. Put a tool into the screws for the feathering shaft and give full twists - nothing should move. Fire up slowly and look through the blade grips (at zero pitch) it should be a clear, square view. A bit of blur on the top or bottom edge means the grips are off. You can take them off and put a straight edge to them and hold them side by side - you shouldn't see a difference. Yes, they make the plastic very percise. Metal makes 'em look better and maybe last a bit longer. If everything is straight and equal... put on one blade, mark it, and make sure it zeros when it's supposed to (DO NOT THROTTLE). Now put the other blade on and compare to your reference blade. DO NOT adjust the reference blade. If you are Flybarred, make sure the short links are to spec and EQUAL. Now, you can adjust the long linkage up from the swash, one full turn at a time. Leave the referrence blade alone. You are adjusting only one blade's pitch. Tracking is always done from zero pitch - why the referrence blade. For FBL, there is no short link for the Bell and Hiller just the long one up from the swash. Note: the swashplate does have to be dead level for this. A Trex in good shape should track level. Hopefully, I helped or gave a someone else an idea to suggest.
450 Pro 3G "Super Clone" - when it blows up, rebuild faster
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08-02-2012 01:52 AM  9 years ago
dkshema

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Cedar Rapids, IA

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Are you using the 205D CF blades? Both of my 250s have tracked well from day one using those blades.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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08-02-2012 02:34 AM  9 years ago
rpat

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Weirton, W. Va.

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I am using the 205d blades and even tried a second set just to eliminate the blades themselves. I did crash it a couple of times when I first got it but just about the whole head has been changed including the main and the spindle the grips and anything else that was suspect. I have changed every thing that I could think of and have tried and tried to get the unmarked blade to come into the other blade without any success.I was just messing with it now and the flybar cage has side way play in it like there is a couple of washers missing. Just wondering if this has any sway on this situation. The instructions don't show any washers between the cage and the pivot piece.trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-02-2012 02:39 AM  9 years ago
dkshema

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Cedar Rapids, IA

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Bent main rotor head from a crash, or bent main rotor blade grip/ball.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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08-02-2012 02:49 AM  9 years ago
rpat

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Weirton, W. Va.

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Dave,
I have tried two different sets of grips. You metion the main rotor head...that's the only thing that I have not changed. I guess that I will try that. How about your flybar cage does it have play in it?
trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-02-2012 02:57 AM  9 years ago
dkshema

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Cedar Rapids, IA

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The one that still has a flybar is an SE and the flybar cage has play in it. Before I converted the other one to FBL, it was the original 250 and had slop everywhere. But tracking was never an issue.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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08-02-2012 03:15 AM  9 years ago
rpat

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Weirton, W. Va.

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Ok thanks. the cage must have play in it and that's that I am going to try a new head block.trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-02-2012 04:19 AM  9 years ago
jschenck

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La Vista, NE.

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When you tighten down the grub screws on the flybar cage squeeze the ends of the flybar cage together a bit and it'll take up a lot of that side to side slop. shouldn't be much there.

My 250 FB head has slop in it everywhere. It was the reason I bought the 250DFC kit (which I haven't built yet). But I can get it to track also. Mark one of the blades with a bright colored marker on the tip so you can see which one is flying higher. helps to id which blade needs to be adjusted. really spend some time to get both blades measured at 0 pitch at center stick.

check for any overly loose pivot points. I've bent several 250 head blocks, they just plain bend on a solid impact. Also several times I've had a blade fly out of track it was the ball link on the blade grip was slightly loose. I red loctite those in place now.

The 250 is sensitive to play in the head. The tighter you can get it the better it'll fly, as long as there is minimal to no drag. quite a balancing act to get them right but once you do they fly great. Unfortunately those small and cheap bearings don't take much of a hit so you may be chasing problems there too.

always check the balance of the main and tail blades. I've pulled more than one set out of the package that needed a little tape to balance both main and tails.
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08-02-2012 05:11 AM  9 years ago
rpat

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Weirton, W. Va.

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Thanks js,
I,ll try that on the cage but the more that I think about it I am pretty sure it is the head block. That is the only thing that I haven't changed on it. I have tried every thing that has been suggested here except the head block, and I did have a couple of doozies when I first got it.
trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-05-2012 05:31 PM  9 years ago
rpat

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Weirton, W. Va.

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Ok I changed the head block and it is tracking good now. I placed the new one against the one that was on there but could not see any difference.trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-06-2012 05:16 AM  9 years ago
jschenck

rrProfessor

La Vista, NE.

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put the head on a spare mainshaft and see if you can rock it back and forth. The bottom part of the head spreads open when they get bent.
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08-06-2012 05:26 AM  9 years ago
dkshema

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Cedar Rapids, IA

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I learned about having to troubleshoot bent heads when I owned my Sceadu EVO 50. Though the head itself was plastic, it fit on what looked to be a pretty beefy aluminum hub. Looks were deceiving and I bent more than one in a crash.

Within the past year, I had a 450 do something similar, only the tracking was OK but I had a vibration that drove me nuts! Turned out to be the head instead of the usual suspects back on the tail.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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08-06-2012 11:55 AM  9 years ago
rpat

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Weirton, W. Va.

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Do you guys know if any one makes a harder dampener for it? As fast as that head is turning I am not sure if the stock dampeners are up to the job.trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-06-2012 02:25 PM  9 years ago
jschenck

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La Vista, NE.

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been a while since I bough them but I've used trueblood dampers for my 250 and liked them.
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08-07-2012 12:00 AM  9 years ago
rpat

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Weirton, W. Va.

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Js
Where did u get them?
trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2
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08-07-2012 04:42 AM  9 years ago
jschenck

rrProfessor

La Vista, NE.

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google search for "Trueblood Head Dampeners - Trex 250" turned up a few dealers listing them.
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