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  #1  
Old 08-21-2018, 05:30 PM
Mycool Mycool is offline
 
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Location: West Hills, CA
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Default Spar upgrade

Has anyone completed spar upgrade?
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  #2  
Old 08-22-2018, 12:55 PM
dlomheim dlomheim is offline
 
Join Date: Sep 2006
Location: (2OK2) OK City, OK
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Default Spar Upgrade(s)

Quote:
Originally Posted by Mycool View Post
Has anyone completed spar upgrade?
There are various wing upgrades for the RV-3 as seen by the RV-3A I used to own which only had one upgrade accomplished. Mine didn't have the angle aluminum mod to the front spar, which didn't look like it would be that hard to do; but I had no intention of doing aerobatics while I owned it; so I never messed with it. If you do a search of the archives, you will find previous discussions and pictures of others who have already gone down that road.

Doug
RV-9A Mazda 13B/FWF
RV-3A O-290G (innovated, flown and sold)
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  #3  
Old 08-23-2018, 05:20 PM
Mycool Mycool is offline
 
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Location: West Hills, CA
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Thx Doug, got ahold of this website...http://www.romeolima.com/rv-3.com/info/CN-2.pdf.

Great info, but needed to contact Vans to get Cn-2 drawings.

With upgrade Ill get +/- 6 gs more than enough for what Ill need.
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  #4  
Old 08-23-2018, 05:30 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by Mycool View Post
With upgrade Ill get +/- 6 gs more than enough for what Ill need.
Looks like it is actually +6/-3 g's. But I'm sure that will be sufficient.
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  #5  
Old 08-24-2018, 06:27 AM
Mycool Mycool is offline
 
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Default Corrected

Thanks for correction.
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  #6  
Old 08-26-2018, 10:43 AM
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dacronwall dacronwall is offline
 
Join Date: Oct 2013
Location: Palo Alto,CA
Posts: 88
Default Spar Upgrade Done!

Yes, I have had the spar upgrades done, both CN-1 and CN-2. Keep in mind, EVERY RV-3 is hand made, and not pre-punched. They are all different in some way. In order to complete my spar mods, we had to consult and get approved drawings from Vans, as (go figure) there were some differences in what we found inside my wings when we opened them up.
My plane was built in '84 by a guy who took the initiative and built some strengthening measures into the wings prior to the change notices. My plane is one of the original "Bakersfield RV's" imagined, built, flown and abused by the likes of John Harmon, and my builder Gary Banducci. N66GB was fitted with an O-360 and CS prop and raced at various points in her life, so the measures Gary built in kept it safe all these years, but in order to race at Reno, you have to demonstrate a 4.5 G pull-up, and without the spar mods, these older planes are limited to 4.2 G by Vans. Mine was tested and flown at over 6+ g's so I knew it was safe, but that pesky service bulletin from Vans meant I had to do the changes.

The "parts" amounts to some rivets and screws, and a bunch of angle metal...not much to it. But you have to order "the kits" from Vans, and register as having received them, and then make the required log book entries by qualified person stating that they have been completed in order to return the +6/-3 rating.

Its all in the details. The wings have to come off, which requires disassembly of the whole cockpit, then the wing skins get drilled out and rolled forward to expose the spars. Angle doublers, lightening hole patches, straps and brackets are installed and then you put it back together. It is no small project.

If you want to have it done, you need to find someone to do it...which is the hard part. I have a guy, he is an RV-3 owner and had done it before, so he fixed me up.


Best of luck

Dave
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  #7  
Old 08-30-2018, 04:28 PM
Mycool Mycool is offline
 
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Thanks for the info Dave, Ive decided Im going to tackle this project myself. This baby will shine and do +6/-3 when Im done.
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  #8  
Old 08-30-2018, 06:07 PM
FinnFlyer FinnFlyer is offline
 
Join Date: Aug 2018
Location: Bell, FL
Posts: 12
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Have you considered getting the RV-3B wings from Vans?
I think there's even a quick-build option. Then you "only " have to drill out and install the matched bulkheads in the fuselage.
I did the CN-2. Not all that difficult if you don;\'t mind drilling out tons of skin rivets.
Have a real heavy bucking bar to set those 3/16" rivets in close quarters.

Finn

Last edited by FinnFlyer : 08-31-2018 at 02:08 PM.
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  #9  
Old 08-31-2018, 06:41 AM
Mycool Mycool is offline
 
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The Cn-2 fix is a lot cheaper only $70 for hardaware kit and only $45,000ish of my labor.
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  #10  
Old 08-31-2018, 01:08 PM
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dacronwall dacronwall is offline
 
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Location: Palo Alto,CA
Posts: 88
Default CN-2 spar mod

Best of luck. Its not complicated, but does require time and skills. If you find anything that does not match the plans, consult with Vans for sure. I have lots of pictures of mine at various stages if you want to see what you are in for.
Cheers
Dave Cronwall
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