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HelicopterMiniature Aircraft Whiplash & Fury 55 › fury tempest fai gears not meshing
12-17-2003 07:08 PM  13 years agoPost 1
steve196411

Heliman

london england

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why is my gear ( 0866-5 ) shreading and being very noisy espesialy when hard rudder is put on

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12-17-2003 07:35 PM  13 years agoPost 2
steve196411

Heliman

london england

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i have no shim there as well ive adjusted al ways and seems to make no differance how much backlash should you have when turning tail roters

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12-17-2003 08:42 PM  13 years agoPost 3
Vinnie

Senior Heliman

Miami Beach, Florida

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Also

One way of getting the front transmission bevel gear properly placed is to insert a 1.5mm allen shaft in between the bevel gear and the front transmission bearing block (either the one piece or two piece design), push the bevel gear up against the allen shaft, and then tighten up the set screws.

I ate up a crown gear on an incorrectly installed setup and someone told me about this trick, everything runs good now.

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12-17-2003 10:58 PM  13 years agoPost 4
vitek

Key Veteran

Corvallis, OR

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One way of getting the front transmission bevel gear properly placed is to insert a 1.5mm allen shaft in between the bevel gear and the front transmission bearing block.
That technique is mentioned in the manual. It helps to set the bevel gear back, but doesn't do anything for setting the mesh if the crown is sitting to low.

Travis

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12-17-2003 11:07 PM  13 years agoPost 5
Vinnie

Senior Heliman

Miami Beach, Florida

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true

That's a good point.

I think the best way to get the vertical position correct is to start with no shims and see if that is too tight (it usually is). Then, start adding shims in the smallest possible increment and feeling out the mesh until it is smooth.

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01-07-2004 05:05 AM  13 years agoPost 6
Greg Faust

Senior Heliman

Northern VA, USA

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gear mesh

I recently built my first MA machine which also was a Tempest. I was not happy with the mesh between the crown gear and tail drive gear because it was too loose even with no shims. I had 3 different experienced pilots/mechanics look at it and they all agreed with me. After looking at their machines I agreed with them also. The problem is that the shims only make the mesh looser and I needed to make it tighter. I ended up removing 1/10th mm from the brass bushing with 400 grit aluminum oxide sandpaper to achieve the perfect mesh. I decided to start with 1/10th mm because I could always add more space back by using the shims which still ended up not being used. It is now several gallons later and everything is still running smoothly.

Just out of curiosity, has anyone else had to remove material from the brass spacer?

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01-07-2004 07:12 AM  13 years agoPost 7
vitek

Key Veteran

Corvallis, OR

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Yes. I had to file down one of the spacers on my Furys to get a good mesh. I own 3.

Travis

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01-07-2004 02:26 PM  13 years agoPost 8
Vinnie

Senior Heliman

Miami Beach, Florida

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whoa

Good idea, I always wondered how to make the mesh tighter once there are no shims.

So what holds the main gear in place, the split collars? What if the main shaft falls a little bit?

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01-08-2004 02:52 AM  13 years agoPost 9
BIGRCR

Veteran

Easley, South Carolina

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Another thought. If by chance the lower bearing (bearing 2nd from top)loosens from it's Locktited position seated in the block, it can ride up in the block.This makes the proper gear mesh a real problem when tightening down the split collars as the brass shim will seat against the bearing inner race with it ridden up in the block. Look and make sure ( if an older block with time on it) that the bearing is still fully seated in it. The bearing should be flush or ever so slightly recessed in the block. If not, replace the block/bearing or take it apart, clean it with a solvent and re- Locktite it so that is is again seated.

This caused me a bit of grief a few months back on one bird until I realized what had happened. It was my bad, I had not checked it in many flights and upon reassembly, I failed to catch the loose bearing in the block as I had only checked it for a worn bearing.

Later,

BIGRCR- John Garst

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01-09-2004 02:17 AM  13 years agoPost 10
RotorX

Key Veteran

London

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I find it disturbing that a top machine you have to start filing and messing around to get the desired result, the cost of these machines they should be perfect - disappointing

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02-05-2004 09:42 PM  13 years agoPost 11
Nickjones

Heliman

Devon, England

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Never experienced this problem. The new Tempest went together so well I thought I had built it before! If stuff didn't fit right, I hadn't assembled it right!

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