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HelicopterMain Discussion › As Anyone Experienced This!?
04-11-2011 01:09 AM  6 years agoPost 1
ChuckJrster

rrVeteran

West Monroe, LA - USA

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I keep getting very slight boom strikes on my Align T-REX 600e original. The strikes are happening right behind the horizontal fin and clearly impact directly on top of the boom there. I've had three of these thus far recently, some more severe than others (whenever I had some original Align black dampers in the head) and those wore out pretty quickly and I had a lot of play in the head I actually had one of the blades slice through the top 1/4 of the boom, I heard it and it also impacted the TT inside the boom! Thing was, the blade that did that was only slightly damaged on the tip of the trailing edge! Go figure that! I'm still flying those same blades! so, I'm sure that the boom strike then was due to the wore out dampers. I've recently re-greased my thrust bearings, I checked the spindle shaft and it's fine and straight and I've installed some yellow KBDD head dampers and it didn't have any play in the head when I put them in. Now, after about 6 or 7 flights with the new yellow KBDD dampers in, I got a slight boom strike in the area of my heli as I described above. I didn't even hear it! Also, yes my heli does now have a very small amount of play (as I'm assuming and sure that the dampers are wearing some) but still, this shouldn't cause a boom strike could it!? So, I'm assuming that's not the problem, so, the question is, what else could it be!? Could it be a bad blade (as it's always been the same blade that has struck the boom) do I need to actually replace the thurst and/or the radial bearings in the blade grips and perhaps the actual spindle shaft too? (just to be sure etc.) Yes, I keep my blades in the blade grips pretty tight but not overly so, so that it doesn't put any undue stress on the bolts themselves. They are really snug as I would describe it. I've had this heli for some time now, and, have never experienced this. I'm at a loss and any ideas and/or suggestions are most welcome. Thanks.

Chuck

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04-11-2011 01:30 AM  6 years agoPost 2
Eury

rrProfessor

Dover NH

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The only thing I can think of is low head speed with the blades too loose. You load the head in a maneuver, the blades start lagging, and that trailing edge hit.

Nick Crego

Citizen #0168

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04-11-2011 01:37 AM  6 years agoPost 3
fenderstrat

rrProfessor

Aston,Pa

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have you checked the blade grips for any play,maybe time for new bearings?

the blades are tracking correctly?

are these strikes in the air or on the ground with neg pitch applied at spool up/down?maybe too much neg pitch in your normal(or whatever you spool up in) mode

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04-11-2011 02:26 AM  6 years agoPost 4
ChuckJrster

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West Monroe, LA - USA

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Guys,

Thanks for the replies. I'm pretty sure that I just found the problem. There was always only of the blades that would hit, so, I just pushed it down (by holding the other blades blade grip) and it does flex more down than the other blade! Also, when I did this, it would make a weird creaking sound and the other one doesn't. I also torqed and twisted the blades that are on my T-REX 500 and 700 and none of them make this weird creaking sound. So, I believe that's gotta be it. Time for some new blades I guess. I'm going to check with whom I purchased the blades from and/or the actual manufacturer of said blades to see if they can offer a solution and/or if they've heard of such a thing. Of course, this blade may have "gone bad" if you will whenenver I had the more severe strike (before putting in those better dampers) a while ago. The only thing that's "visibly flawed/wrong" with this particular blade is, is that on the tip of it on the trailing edge, is chipped, which occured whenever I had the bad strike. Could this though have weakened the whole blade!? Again, thanks for the replies. I'm going to change blades, put a piece of electrical tape there where that particular blade struck the boom, fly it just like I did today and see what happens. With the tape there, I can make sure that if I get close or, even have this happen again, I'll know since it'll rip the tape off etc. Wish me luck!

Chuck

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04-11-2011 04:03 AM  6 years agoPost 5
SkySurfer

rrApprentice

usa

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The only thing I can think of is low head speed with the blades too loose. You load the head in a maneuver, the blades start lagging, and that trailing edge hit.
+1

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04-14-2011 08:58 PM  6 years agoPost 6
ChuckJrster

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West Monroe, LA - USA

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Again, thanks for the ones who replied/responded here. I found the problem, I had a flawed blade, so, I'm going to close this thread. Thanks again.

Chuck

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