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Robbe › Tail bearings and bushings
06-04-2004 06:43 PM  13 years agoPost 1
RMoore

rrNovice

Huntsville, AL

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I am in the process of repairing after a minor tip-over, and have the tail boom off, so I took out my tail drive bearings and re-lubed them. I have the standard 3 bearings that come with the mod from rchover, and I'm wondering if it would help or hurt things to put in my original 2 bushings along with the bearings. They would be distributed evenly along the drive wire - bearing/bushing/bearing/bushing/bearing. My bushings have not worn any, so they are still nice and tight.

I ask this, because before my tip-over, I still had some tail vibration even after the tail drive bearing mod was installed. So I'm hoping adding the bushings back in might help that. I've balanced both the MR and TR as accurately as I can, so I'm not sure what else to do about the tail vibration. Also, while I had the Eolo torn down almost completely, I checked my MR shaft for straightness, and it rolls cleanly on a glass table top.

Thanks!

Randy

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06-04-2004 07:20 PM  13 years agoPost 2
MarkusD

rrNovice

NRW-GERMANY

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Tail bearings & bushings

Hi RMoore,

I have a similar problem - I installed the german MS-Composit alloy headblock as well as the aluminum tail gearbox and that helped me quite a lot. I use approx 1650 rpm on the MR.

Since a while I encounter a tail kicking phenomenon which is quite strange and difficult to reproduce. I have ordered the HeliUp bearings as I belive that the Robbe bushings are worn out & I will stiffen the gyro plate (HeliUp).

A friend of mine has the same problems and he already has the 3rd bearing upgarde from MS-C. Germany.

We are both using a GY-401 / CS-12 combo.

As you are approching the problem from "the other side" you should consider the alloy MR and the 3rd bearing as a lot of vibrations come from the MR.

You should also balance the tail blades dynamic (with SCOTCH tape & immediate check @ right Rpm) - as this might also help. You can see that we invested a lot of time and money & we are not yet fully satisfied. The most worrying thing is that we aren't 3D pilots - we just want to fly normal @ normal Rpm.

To answer the question in your thread: I don't belive that a combo of bearing & bushings will help a lot !!

If anybody can help RMoore or me would be fine !!

Cheers

Markus

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06-07-2004 05:25 PM  13 years agoPost 3
RMoore

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Huntsville, AL

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Let me bump this one to the top again. I hope to complete my repairs to my Eolo in the next couple of days (wahting for a small package from rchover), so I need to decide whether to keep the bushings in place, between the 3 bearings on the tail drive wire. Any others want to comment on the wisdom of doing that?

Randy

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06-07-2004 06:28 PM  13 years agoPost 4
Buzzsaw46

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Spring Valley, MN.

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I dont think it will hurt any to leave the bushings in place, weather or not it will help any I couldnt say.

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06-07-2004 10:24 PM  13 years agoPost 5
steph

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Hampshire England

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Mine are still in along with the ballraced ones

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Robbe › Tail bearings and bushings
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