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  #1  
Old 10-10-2018, 08:04 PM
RhodeIsland9 RhodeIsland9 is offline
 
Join Date: Mar 2010
Location: Middletown, RI
Posts: 32
Default Elevator counterweight installed wrong side RV-8

So I managed to install the right elevator counterweight (trimmed) in the left side (and vise versa right side) during final riveting.
note: fiberglass tips are not installed

Problem is, when the counterbalance skin is riveted around the counterweight it is not easily removed. (did I mention that I also used Proseal on the counterweights).

Looking for advice on options

1. Do nothing and the elevators will still balance as a complete assembly but not individually.

2. Carefully trim the right counterweight in place and save the piece removed to bond/fasten to the left side.

3. Carefully trim the right counterweight in place and drill remove counterbalance skin install new full size weight on left side(possibly skin ribs spar if damaged during removal).

Is it important to be able to individually balance the elevators?
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  #2  
Old 10-10-2018, 08:50 PM
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Champ Champ is offline
 
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Location: Kingsville, Ontario, Canada
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Default

If my memory is right I think Vans recommends to balance the L & R elevator halves individually. My counterweights are bolted in per plans but this should have been done with nutplates to make them re torque able without having to cut thru the fibreglass tips to get at the nuts.

I did balance individually and had to trim the right counterweight and bolt a piece onto the left side because of the weight of the trim servo.

I donít know that I would trust proseal to hold the counterweights on.

Individual vs combined balance has been covered on VAF before.
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  #3  
Old 10-11-2018, 06:15 AM
RhodeIsland9 RhodeIsland9 is offline
 
Join Date: Mar 2010
Location: Middletown, RI
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Default

Quote:
Originally Posted by Champ View Post
If my memory is right I think Vans recommends to balance the L & R elevator halves individually. My counterweights are bolted in per plans but this should have been done with nutplates to make them re torque able without having to cut thru the fibreglass tips to get at the nuts.

I did balance individually and had to trim the right counterweight and bolt a piece onto the left side because of the weight of the trim servo.

I donít know that I would trust proseal to hold the counterweights on.

Individual vs combined balance has been covered on VAF before.

The counterweights are bolted in with nutplates, Proseal was added insurance to keep them secure. The difficulty is removing the weights to place them in the correct location.



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  #4  
Old 10-11-2018, 07:08 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 900
Default A tail of two citys.

There are two types of weight installations on the 8. An older one and the newest stile that has been out for a few years now, after the up-data to total pre-punched. My only comment is that for both, I have seen a lot of none serviceable installations. Pop rivet covers and the like. It is worth it to take the extra time and install them so they can be serviced later on. Bolts, nuts, nut-plate, screws " instead of pop-rivets" and so on. If you are going to keep the aircraft for a long time, you will be glad you did, in the years to come, when you re-balance after paint or repairs. Just an idea for thought. Yours, R.E.A. III # 80888
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  #5  
Old 10-11-2018, 08:28 AM
RV6junkie RV6junkie is offline
 
Join Date: Jul 2006
Location: NJ
Posts: 86
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You have a few options. One is to disassemble and build back up as per plans. The other is to simply rebalance each elevator after they have been mated to the HS. Letís face it, you are going to have to rebalance after paint anyway. One will probably need to be drilled and youíll have to add weight to the other. Itís no big deal.
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  #6  
Old 10-12-2018, 03:18 AM
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I-TERA I-TERA is offline
 
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Location: legnano (milan) italy
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Easy to reduce the counterweight drilling out some lead, easy to add small ( 4X20X30 mm) pieces of lead with a big soldering iron ( not a flame welder ) and tin, hard and safe .
Claudio
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  #7  
Old 10-12-2018, 07:34 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,546
Default

Quote:
Originally Posted by RhodeIsland9 View Post
So I managed to install the right elevator counterweight (trimmed) in the left side (and vise versa right side) during final riveting.
note: fiberglass tips are not installed

Problem is, when the counterbalance skin is riveted around the counterweight it is not easily removed. (did I mention that I also used Proseal on the counterweights).

Looking for advice on options

1. Do nothing and the elevators will still balance as a complete assembly but not individually.

2. Carefully trim the right counterweight in place and save the piece removed to bond/fasten to the left side.

3. Carefully trim the right counterweight in place and drill remove counterbalance skin install new full size weight on left side(possibly skin ribs spar if damaged during removal).

Is it important to be able to individually balance the elevators?
It sounds like you have the flat counterweights not the ones that fasten on the leading edge. There are only a few parts to covert to the later style and it will save a lot of weight on the tail section. I seriously considered upgrading to the later style and found there are only a few parts different. What ever you do, just bite the bullet and do it right. Only a few hours difference and I have slept better after it was done. Drilling out the rivets is not an issue and the mental is always harder than the actual for me.

I had to make a new forward skin (25hrs), remove the roll bar and all the hardware under it to set 4 rivets (20hrs). Some things you just can not tweak. RVBuilder2002 (Scott) gave me really good advice, "no other right way to do it, Bill". Now flying, I don't regret either "little" project. The sting of time is gone and happy with the lasting quality.
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  #8  
Old 10-12-2018, 10:09 AM
nilberg nilberg is offline
 
Join Date: Dec 2012
Location: Katy, TX
Posts: 179
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The way the plan is for the current counterweight, I would like to see a serviceable version that do not compromize the securing of the counterweight.

Right now, even with replacing the nylocks with nutplates, the led is still locked in due to the countersinked led and dimpled skin.
However, if serviceable means checking the two bolt for torque, then it seem like a good idea to have nut plates on the flange.
Would attaching a nutplate with pull rivets be a solution ? I am tempted, even if the counterweight itself is going nowhere.

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Last edited by nilberg : 10-12-2018 at 11:21 AM. Reason: A little more thinking and added picture
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  #9  
Old 10-12-2018, 03:20 PM
RhodeIsland9 RhodeIsland9 is offline
 
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Location: Middletown, RI
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The mention in a earlier post about the older flat counterweights got me thinking.

This is a counterweight from a RV-6. Installed with bolts and platenuts. It would eventually be trimmed down to replace what was mistakenly removed and make the elevator balance post paint.

I like the idea of being able to remove, trim and reinstall the weight for a perfect balance.

Would this be an acceptable solution?


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