T-405 tank attach bracket

tmbg · Post by **tmbg** » Fri Aug 31, 2007 10:50 am

the drawing shows a radius for the 2 1/2" face, but it doesn't list what that radius is!

Also, how critical is this part, in terms of making sure that the face that attaches to the fuselage is aligned correctly and in the right spot? It seems like there's a lot of opportunity to screw this up if the fuse attachment is critical in any way.

cjensen · Post by **cjensen** » Fri Aug 31, 2007 11:48 am

Just get the radius close to the drawing (I know it's half scale, but close is pretty easy to eyeball). The only thing that is critical about the radius, is making sure you have at least a half inch edge distance from the center of the bolt hole (which you will drill LATER). I didn't read far enough ahead to know that, but I had almost 3/4", and didn't plan for it.

As far as alignment goes, just get it close to square. You will have some wiggle room with the F-796A bracket that it attaches to, and how it attaches to the fuselage.

tmbg · Post by **tmbg** » Fri Aug 31, 2007 1:08 pm

square to what though? It looks like it needs to be square to the up and down "dips" in the rib... I dunno how else to describe what I'm talking about, but do you follow me?

cjensen · Post by **cjensen** » Fri Aug 31, 2007 1:08 pm

That's EXACTLY how I did it!

captain_john · Post by **captain_john** » Sat Sep 01, 2007 6:58 am

Ian, I think you are asking,

1) About how to shape it
2) Where to put it

Shape it to match the inside of the rib and place it on the rib so that the vertex of the angle is parallel with the corrugation in the rib.

Does that help?

CJ

Thermos · Post by **Thermos** » Mon Sep 03, 2007 6:43 am

Ian,

One other thing you may already know, if so then disregard....

The plans aren't clear about when to rivet the T-405 in place. If you attach it to the rib before you rivet the rib to the tank skin, you'll have a hard time setting the skin-to-rib leading edge rivets.

At the suggestion of someone in Van's tech support, I waited until after riveting the ribs to the skin to rivet the T-405 and T-410 doubler to the ribs. It was a pain, but was easier than hogging out those beautiful T-405s to get a thin-nose squeezer set in for the leading edge rivets.

Hope this helps...

Dave

tmbg · Post by **tmbg** » Tue Sep 04, 2007 9:42 am

Thanks folks. I didn't get a chance to work on it at all this weekend, was up in the mountains dragging knees

Hopefully I'll get back on it tonight.