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T-REX 600 › DFC head block - is mine out of spec?
03-16-2014 07:30 PM  4 years agoPost 1
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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I have 2 Trex 600 helis with the 600 DFC head.

The on the head of heli #1 perfect.

But, the DFC head on heli #2 has a problem: I think the head block is out of spec.
When fully assembled, there is a noticeable play in the grips relative to the head block. It isn't much, but it is there.

I've asked others to confirm, and they can feel it too. But, no one can say if it is bad enough to worry about - but they all think it isn't "normal".

At first, I thought the head block's jesus bolt was loose or not clamped down tight. But, that is not the case.

After close examination, it is clear the hard, black, dampers are not a good fit in the recess in the head block. They are loose and have radial play. They are so loose they will actually drop out of the head block.

I have tried 2 packages of new 600 DFC dampers (4 per pack). In each pack, I will measure the diameter and pick the 2 that have the biggest diameters. But, there really isn't that much difference.

I started with the V1 feathering shaft, but now I have the V2 feathering shaft (same as heli #1). The dampers fit fine on the feathering shaft - about the same as heli #1.

There is no obvious damage on the head block. There are no scratches on the inner surface of the recess and they seem to be perfectly round.
It just seems to be a fraction of a mm too large.

I have ordered a new DFC head block.
In the mean time, I wanted to know if anyone else has seen something like this?

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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03-16-2014 08:07 PM  4 years agoPost 2
dcbusdriver

rrApprentice

Stephens City,VA -USA

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Take your head apart completely and pull the dampers out of the block. Take a plastic bag like a ziplock, etc and place a single layer of it across where the damper goes and pull it fairly tight. Now push the damper back into place letting the plastic bag act as a shim as it slides all the way in. Then tack an exacto blade and trim off any exposed plastic. Put the head back together and the slop should be all gone. This procedure was given to me directly from Patric, the owner of KDE and it works great. Hope this helps.

beating the air into submission...........cool!

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03-16-2014 08:20 PM  4 years agoPost 3
ticedoff8

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Morgan Hill, CA. USA

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Neat trick! I'll try it this afternoon.

So, this must be common?

I guess I got lucky on the 1st 600 DFC head block. The dampers are a nice, tight, fit.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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03-16-2014 08:36 PM  4 years agoPost 4
dcbusdriver

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Stephens City,VA -USA

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Mine on my first 600 were fine too. Decided to by the KDE DFC head block to try it out. The dampers were so loose in it they would just fall out. Patrick then gave me the scoop on the fix. They will also do that with time and use due to their hardness.

beating the air into submission...........cool!

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03-17-2014 12:42 AM  4 years agoPost 5
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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I just finished.
I used thin Saran Wrap and the dampers are now snug in the recess.

But, I am concerned about durability.

I looked at the Ziploc bag material and it is a little thicker and maybe a little more durable(?)

I also noticed that the Saran Wrap left wrinkles and folds around the outer surface of the damper - that would make it tighter at the start, and I figure those will be areas that get worn down the fastest.

I will check between flights (the wiggle test) to see if they loosen up again.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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03-17-2014 01:27 AM  4 years agoPost 6
dcbusdriver

rrApprentice

Stephens City,VA -USA

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Yeah, I used a little thicker plastic than plastic wrap. The great thing is its easy to swap out if it gets worn down vs getting new dampers.

beating the air into submission...........cool!

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03-20-2014 04:09 PM  4 years agoPost 7
Jim Patterson

rrApprentice

AREA 51 Roswell

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Good info. I just got one of these myself and will be checking my DFC this evening. However, during the build I didn't notice anything unusual in the head.

Highly addicted to carbon fiber.....

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