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08-13-2006, 01:04 PM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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double flush rivets?
For the training project, the rivets along the trailing edge skins, through the trailing edge wedge, are supposed to be AD3-3 rivets. These barely make it through all the material. The instructions say they should be "double flush", which I guess makes sense, because when I back-rivet these short rivets through the trailing edge, the shop head is very small,and basically flush with the skin.
My concern is that I can't imagine there will be much/any strength in these rivets... have I misunderstood something?
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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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08-13-2006, 01:31 PM
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Moderator/Tech Counselor
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Join Date: Jan 2005
Location: East Troy, WI
Posts: 1,983
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The length rivet used to double flush should be sufficiently long to fill (or nearly fill) in the dimpled and/or countersunk area. You are, in affect, creating a flush head rivet shop head by slowly working the rivet into shape. It is a slow, deliberate process that may require some practice before you rivet trailing edges with the AEX wedge. Combinations of flush set and backriveting are usually necessary.
Roberta
Below are examples of MFG flush heads (black line) and flush shop heads (red line). Care in shooting these will result in nice, flat, shop heads that will nearly look like MFG flush heads.

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Roberta Hegy
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo
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08-13-2006, 01:33 PM
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Join Date: Jan 2005
Location: Boise, ID
Posts: 1,007
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Nope, you haven't.
Instead of a 1 1/2 diameter unbucked protrusion, a rivet destined for double flush is about 1 diameter proud of the shop head surface. If any longer, the shop head won't be contained within the dimple/c'sink.
John Siebold
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08-13-2006, 02:17 PM
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Join Date: Jun 2006
Location: Castaic, CA
Posts: 549
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Thats how they shold look, like it didnt fill the countersink all the way on the shop head side. The tricky thing here is getting them all set without putting a big bow in the trailing edge.
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Mike Sumner
Castaic, Ca
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08-13-2006, 02:26 PM
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Join Date: Jan 2005
Location: McDonough GA
Posts: 18
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The rivets for the trailing edge are AN426AD3-3.5 the 3-3 are for the stiffers
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Mike Crowe
McDonough GA
RV8A
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08-14-2006, 07:21 AM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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the plans for the practice project said to use a flat (mushroom) rivet set. What does "mushroom" refer to here?
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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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08-14-2006, 07:47 AM
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Join Date: Mar 2005
Location: Las Vegas
Posts: 736
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Mushroom refers to the shape of the rivet set, also called a flat set but if you look from the side it looks like a mushroom. There is a slight parabolic shape to the surface, not quite flat. Just use your normal flush riveting set, you'lll be fine.
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Rick Sked
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