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-   -   Installing SB 18-02-02 (https://vansairforce.net/community/showthread.php?t=157967)

Tacco 02-25-2018 12:28 AM

A search of the forum seems to indicate the flanges are oriented outward for ease of riveting (driven rivets) and its not a structural issue. I paid close attention to rib configuration and flange direction on the wing because it mattered given other design differences of some ribs. Guess I missed it here. But hey, the holes lined up perfectly! Read the plans, read the plans ....read...:o.

joedallas 02-25-2018 06:33 AM

Steve

The only reason I could come up with is that it would allow better access of your hand to install the Stabilator.

I installed them with the hard side out to better support the skin cantilever .

I now also think this will help support the outward hinge bracket ? ( THINK )

I am building EAB and I made a lot of changes that may or may not be better.

I received my SB kits and I will modified them as not to add the doubler on the skins.

The shear load on the outward hinge half can be handled by the wing skin.

This is not a recommendation to change Vans design.

I would think that vans will change this design for the new kits at some time in the future ?

The RV 12 will evolve.



Joe Dallas



Quote:

Originally Posted by Tacco (Post 1241949)
A search of the forum seems to indicate the flanges are oriented outward for ease of riveting (driven rivets) and its not a structural issue. I paid close attention to rib configuration and flange direction on the wing because it mattered given other design differences of some ribs. Guess I missed it here. But hey, the holes lined up perfectly! Read the plans, read the plans ....read...:o.


ben barron 02-25-2018 08:42 PM

Trimming the tailcone faring
 
I just finished my 18-02-02 install and had to trim the tailcone faring to get the full range of motion.

It also took us more than 8 hours to do the work. I guess we are slow.

Jim T 02-25-2018 09:17 PM

Quote:

Originally Posted by ben barron (Post 1242148)
I just finished my 18-02-02 install and had to trim the tailcone faring to get the full range of motion.

It also took us more than 8 hours to do the work. I guess we are slow.

You did fine Ben. I just finished the SB in 8 hours myself and mine wasn't even on the plane (new construction). Thanks for the "heads-up" about the Tailcone Fairing. I'll watch for that come install time.

Jim

rvbuilder2002 02-26-2018 09:31 AM

Additional comments based on recent posts.....

HS-01231C should not be modified. To do so risks gaining the proper stiffness intended by the SB. One of numerous structural benefits of the part as designed, is that it makes a box structure by tying between the two hinge brackets.

Having all four 3/32 rivet holes riveted in each bracket is important. Do not leave the two holes used to attach the nutplate to the outboard bracket, open on the inboard bracket.

The reason the nutplate is installed with 426 rivets is because that rivet size is already in the kit for use on the HS-01232. Using them on the nutplate also, allowed for only two rivets to be in the SB kit, and since one is a 426 and one is a 470, they are easily identified. Very helpful when all parts are going into one bag.

Tacco 02-26-2018 11:32 AM

Van's says "no big deal" with respect to the front rib orientation. Although I'm sure doing it per plans is preferred. BTW, I suspect the aft ribs are oriented the way they are because, if I recall correctly, there is a separate flange, riveted to the spar box, that they are riveted to. I'm not sure if you reversed them by mistake, that the holes would even line up.

redbaron 02-26-2018 11:41 AM

barrel locking clips
 
Clips included in parts kit per vans

joedallas 02-26-2018 12:20 PM

Still in the dark
 
Steve

The six HS-1204 Ribs are symmetrical and they fit either way, I spent a lot of time to try to see why Vans reversed these ribs.

The center line of the rivets is the same each way.

The only difference is the hard side location.

I could not come up with any good reason so I installed them with the hard side out to help with the cantilever of the skins.

The only thing I could think of is for a little more room for your hands to install the stabilator.

If there is a good reason I would like to know it ?

Joe Dallas





Quote:

Originally Posted by Tacco (Post 1242289)
Van's says "no big deal" with respect to the front rib orientation. Although I'm sure doing it per plans is preferred. BTW, I suspect the aft ribs are oriented the way they are because, if I recall correctly, there is a separate flange, riveted to the spar box, that they are riveted to. I'm not sure if you reversed them by mistake, that the holes would even line up.


Tacco 02-26-2018 01:47 PM

You?d probably have to run the designers stress analysis software to find out if there is any difference stress wise. My guess is that it makes no appreciable difference. I think access to the hinge fasteners is the likely reason. Having struggled a bit the get those nuts on, seems reasonable to me.

Hal-san 02-26-2018 05:49 PM

clips
 
Quote:

Originally Posted by redbaron (Post 1242292)
Clips included in parts kit per vans

Received my kit today. There are no barrel clips in my kit.


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