Patrol Rear Spar Plans Fuzzy

[bergy]

Some of the lines on my Patrol Drawings are blurry. I am not sure about where the 1/2 x 1/16 stiffeners are used on the Patrol rear-spars and I do not want to goof things up

I gather that there are 3/4 x 1/16 cap-strips both front & back, top & bottom = 4 cap-strips each spar

Rear spars have spice-plates both sides. Page 6 Plans for Station-C says 0.032 1/2" x 1/16 both sides,THIS LOCATION ONLY
Yet on middle drawing of page 6 it says 1/16 x 1/2 6061-T6 BOTH Sides Typ.
There appears to be a bit of disagreement in these two statements

Also ... Since the cap strips do not extend down to the outer end of the rear spar, are the rib-attach angle riveted without stiffeners for two of the ribs, then perhaps using a 1/16 x 1/2 filler strip under the rib attach-angle nearest station E?

So I guess my question could be worded this way. Where does a builder NOT use 1/16 x 1/2 stiffeners on the rear spars?

Bergy

[SC Patrol 253]

I'm waiting to see this answer also. I am at the same point of my build.

[Chris In Milwaukee]

This part of the drawing?



I read it as [.032" x 1/2" both sides this location only]. So, because this is where a rib attaches, you have to build up the splice plate to be 1/16" thick at this location to line up with the spar caps, so you're using another .032" piece at his location to level it out for the attach angle. It's not another 1/16" x 1/2" piece, it's an .032" x 1/2" piece in that spot, both sides. It's actually sitting on top of the right edge of the splice plate. This is the only place you'd do this. Then the attach angle rivets flat. All the other spacers are 1/16".




As you move toward the ends where the spar caps aren't, either start the ribs longer and trim each rib to match the location it's attached (accounting for the thickness of the spar cap at each location), or if your ribs are all the same length (as mine are), use longer attach angles or space them out 1/16". Either should do the trick. I made all of my attach angles a bit longer on the rib side so I have the wiggle room for this case.

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[bergy]

Thanks! I didn't realize that the rib attach-angles overlapped the splice-plate instead of being riveted along-side.
The only remaining puzzlement for me is what to do at station E.. The rib attach-angles all appear to have center rivets, but that would not work at station E without a 1/16 filler strip between the two short cap-strip-like pieces used to mount the hinges. I guess I will add a couple of pieces of 1/16 filler, at least on the front of the spar under the rib attach-angle

Bergy

[N3UW]

Bergy,
I added filler strips when I did mine. Basically I added filler strips under any attach angle, as needed, to allow a flat surface parallel to the spar flange for the main and rear spar.