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HomeAircraftHelicopterAlignOther › Have any of you ever bent the head block?
03-06-2008 05:22 AM  10 years agoPost 1
joeycoates

rrApprentice

Dallas, Texas

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I have been chsing down a wicked vibration in my 600n the past few days, it was most noticable on spoolup or spooldown, but sometimes if I made a hard negative collective descent and pulled it to a hard stopping hover the whole helicopter would shake. The skids and flexible tailpipe deflector would become a blur.

Anyway, last night I balanced the fan, checked the runout on the main shaft, tail shaft, and clutch, balanced the tail blades and paddles, and made sure that the flybar was centered with the weights spaced out equally.

So today after work I decided to run it up in the driveway without blades, basically into a fast idel so not to overspeed the engine and lo and behold the damn thing still had a vibration. About this time I noticed that the head button was moving around a bit. So next withthe head at a good idel I bent down to look at the head level with the blade holders and wouldn't you know it the blades holders were out of track. This is without and blades on and I had just put in a brand new feathering spindle.

I shut it down and took in in the garage to swap out the head block as I had another whole head from when I put a 600 head on my Raptor. After swapping everything over I ran it again and vibration gone, blade holders were perfectly in line.

I have stuffed it a few times pretty good, but I would have NEVER imagined that I could have tweaked the head block like that! I mean, it is a pretty good chunk of metal but I guess that anything is possible. I am really looking forward to trying it out now that everything is nice and balanced, but alas it looks like it is going to snow here in Dallas tomorrow (yes Dallas) and just generably be colder then us Southerners like, so I guess that it will have to wait for a few days.

Have any of you managed to tweak a head block? It must have taken one hell of a wallop....

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03-06-2008 05:28 AM  10 years agoPost 2
george0079

rrElite Veteran

USA

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I've bent 4 of them so far. One of them I actually split the side through the hole for the jesus bolt.

If you try hard enough, you CAN bend them.

PS. However, on that note...... I still have NOT bent a spindle shaft on a 600... Go figure...

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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03-06-2008 06:30 AM  10 years agoPost 3
allenl

rrApprentice

Petaluma, CA

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Bent head block
I have crashed twice and bent the head block twice. The first crash was pretty bad. Broke the main shaft in half. The second was pretty bad as well. Not as bad as the first but still bent the head block.

Glad you found the problem. I was lucky enough to be able to see it was bent on the bench when I started putting it back together.

allen

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03-06-2008 11:43 AM  10 years agoPost 4
JeepCJ

rrKey Veteran

Pennellville NY (Syracuse Heli Group)

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I had one split up the side also, first time I had ever seen that happen!

Bob

Team Synergy/ Team Scorpion

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03-06-2008 04:19 PM  10 years agoPost 5
joeycoates

rrApprentice

Dallas, Texas

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george 0079, I have said the same about that freakin' spindle as well, I have NEVER bent one on my TRex! I replaced it anyway when going through the process of elimination, but the one I took out is still good. The old one has been through a number of crashes but it has not bent.

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03-06-2008 05:51 PM  10 years agoPost 6
Nelson J

rrApprentice

Canada

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head block
I have bent one on my T-rex, and yes the blade holders were out of track too.

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