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  #1  
Old 07-28-2018, 09:22 AM
SteFree RV-8 SteFree RV-8 is offline
 
Join Date: Jan 2018
Location: Phoenix
Posts: 12
Default Trim Tab -

Hi Guys,

I have now effed up three trim tabs and I am a bit frustrated. I am wondering if anyone out there would be interested in helping a brother out? If anyone is interested I would send the skin to you if you would be willing to bend the tabs for me? I could pay you for your trouble or I could pay it forward to the next builder down the line.

I have tried three different methods and the version I like best is where I made small riblets instead of bending the tabs. This one turned out the best but I could not solid rivet the trim tab horn (had to use pop rivets) and would really prefer it just be done right.

I have tried the clamping methods shown by vans but my bending blocks keep moving and I feel like sometimes it is just better to see if someone can help rather than beat my head against the wall.

I was moving along pretty well with my build until I hit this wall and now I am kind of stuck and a while the skins are not expensive it is demoralizing to keep messing them up!

If you are interested you can message me off list at steve.freeman @ syntaxds.com. (spaces in email address to help prevent scrapers from snatching email addy.)

Any help is appreciated. If nothing else, does anyone have a good set of pictures for how they did this?

Thanks in advance,

Steve

PS - this is not my first time to the airplane building rodeo (currently flying N902AL I built from kit) but this is the first time I am almost ready to throw in the towel on a part. Ugh...frustrated.
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Phoenix, AZ
Built and Flying Zenith CH650, N902AL
Now Building RV-8

"If you choose not to decide you still have made a choice."

Neal Peart
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  #2  
Old 08-01-2018, 04:31 PM
SteFree RV-8 SteFree RV-8 is offline
 
Join Date: Jan 2018
Location: Phoenix
Posts: 12
Default Found my own solution...

Hey Guys,

I understand if no one wanted to help but I can't believe 177 views and not a single reply.

That is surprising.

Steve
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Steve Freeman
Phoenix, AZ
Built and Flying Zenith CH650, N902AL
Now Building RV-8

"If you choose not to decide you still have made a choice."

Neal Peart
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  #3  
Old 08-01-2018, 06:37 PM
mcoyne34 mcoyne34 is offline
 
Join Date: Oct 2017
Location: Fort Worth, TX
Posts: 19
Default

I would help you if I had the ability to do so, as Iím sure many others would too. I didnít see where you were located after reading your post. Possible I just missed it, but if it isnít there you should add it.
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  #4  
Old 08-01-2018, 06:45 PM
Mark Dickens's Avatar
Mark Dickens Mark Dickens is offline
 
Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,028
Default

Steve,

I understand your frustration and many of us have remade that part more than a few times. The key is making a form block. Martin Filiatrault has a nice series of log entries at http://www.mykitlog.com/users/displa...=216304&row=39. Take the time to make the forming block and it will probably turn out better.
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  #5  
Old 08-01-2018, 08:45 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 968
Default

Quote:
Originally Posted by SteFree RV-8 View Post
Hey Guys,

I understand if no one wanted to help but I can't believe 177 views and not a single reply.

That is surprising.

Steve
Probably because he misspelled Neil's name! That will get you detention at rock school!

But yeah, wedge blocks, double sided tape, clamps, etc. And then make three anyway. It's a right of passage.

The kits are a loss leader. The real $ is in replacement parts!
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Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
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  #6  
Old 08-06-2018, 07:13 AM
Djgeib Djgeib is offline
 
Join Date: Jun 2012
Location: Fernandina, Fl
Posts: 54
Default

I did mine pretty much by the book. Ensure you have tab very secure in all directions before you make bend. Finish up with rivet gun on a low setting.
https://douglasgeib.smugmug.com/N104MG/i-pG7Fwt4
https://douglasgeib.smugmug.com/N104MG/i-4whcWgQ
https://douglasgeib.smugmug.com/N104MG/i-2T8LBX6
https://douglasgeib.smugmug.com/N104MG/i-XMWqPnV
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  #7  
Old 08-14-2018, 10:06 AM
SteFree RV-8 SteFree RV-8 is offline
 
Join Date: Jan 2018
Location: Phoenix
Posts: 12
Default OH man....

Quote:
Originally Posted by fl-mike View Post
Probably because he misspelled Neil's name! That will get you detention at rock school!

But yeah, wedge blocks, double sided tape, clamps, etc. And then make three anyway. It's a right of passage.

The kits are a loss leader. The real $ is in replacement parts!
Oh man....

I know Neil Peart is the correct spelling. That was a type-oh and I am going to go correct the signature now! My on line gaming name is By-tor. I hope that gets me out of Rock Detention. First time I saw RUSH was on their 2112 tour way back in the 70's. Been a fan ever since. Although I did not really care for the syntho-rock phase they went through.

Thanks for all of the replies guys...I found the solution and I am working to move forward.

This part is definitely a rite of passage.

Steve
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Steve Freeman
Phoenix, AZ
Built and Flying Zenith CH650, N902AL
Now Building RV-8

"If you choose not to decide you still have made a choice."

Neal Peart
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  #8  
Old 08-14-2018, 07:38 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 893
Default

Steve,
Being frustrated at this point is not unusual. The good thing I see here is that you are particular, and thatís a positive thing. That little part is not easy to get perfect, but itís not that critical either. On my first airplane I ended up cutting off the messed up bent flanges and making the mini rib that I riveted in place with CS-4ís, and thatís OK to do. If you want to hide your inexperience at this point, thereís bonds/epoxy/filler to cover the pop rivets (I thinks thatís what I did) and it looks better than most done the right way. Good on you for enduring and doing it right. I predict you will do pretty good at upcoming obstacles you will encounter - there are many - and you will end up with a well built safe airplane.
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  #9  
Old 08-15-2018, 07:01 AM
sf3543 sf3543 is offline
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 913
Default

If you were able to make ribs for the trim tab, just bond them in with JB Weld if you can't successfully rivet them. I have done this several times with no problems. Just make sure you rough up the mating surfaces.
Also, when drilling and riveting the trim tab skin to spar, do it in a jig that holds the elevator and trim tab in position so it comes out straight.
It's surprising how easily that tab can get twisted during assembly.
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  #10  
Old 09-02-2018, 09:59 AM
dcl dcl is offline
 
Join Date: Mar 2012
Location: UK
Posts: 23
Default Angles for trim tab block ?

I am just up to building the trim tab in my rv9. I realise I need to build form blocks, but what angles do the need to be ?

I am really sure there is simple answer but am scratching my head at the moment trying to figure it out.

Thanks
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