Q on understanding notation on plan page 5B

[fairchild]

Im on page 5B. In the lower left hand corner there are drawn 3 spar sections---- one called A-A, one caller B-B and one called C-C. There are 3 spar stations on the main drawing that
have "A" and an arrow pointing outboard, one for "B" and another for "C". I THOUGHT section B-B might be from station B outboard to the beginning of station "C". But when I compare
that to the cap strips showing on the B-B cross section--- that doesnt seem to agree with the main drawing........

For instance --- at main rib position #5 --- the main drawing shows 2 layers of cap strips (rear side) where as the B-B cross section shows only 1 layer of cap strips on the rear side.

I get the feeling that I dont understand WHERE the B-B cross section IS on the drawing....... or its a mistake ...... But I gotta think its me thats confused and dont know how to properly
read a blue print.
Im trying to identify the gaps at each station between the center ribs and the rear of the main spar.

Can someone clarify the cross section diagrams ? (model B plans)

Tim

[Flytaildragger]

2 rear meaning top and bottom so that would be 1 layer at Section B-B

[fairchild]

No--- by "2" I mean 2 layers of cap strips stacked.

Looks at the 3 small end views in lower left corner--- one is called "section B-B". That shows 1 layer of cap strips on the rear side. Then look up at the top of the page where
the cap strip lengths are called out----- if you look at where rib # 5 attaches--- the cap strips are 2 deep there--- and that appears to be in side section B-B.
So what is the endways view called "section B-B" trying to show ????? doesn't seem to agree with the top picture.....???? confused …….

( I don't know if your plans are exactly the same or not since I am 4 place B )

(the 2-nd cap strip appears to be centered on the doubler splice plate--- and extends under rib #5 on the inboard and under rib #10 on outboard direction)
Looking at the top most picture -- the "B" zone would appear to go from rib #4 to rib #6. But #4 shows single layer cap strips and 5 and 6 show double deep caps.
So--- what the heck are the section aa, bb and cc trying to tell me ????? doesn't seen to match the main drawing ……. ????

[PFalkner]

Nose rib #4 is at section "B-B"section. "B-B" shows 143 5/8 strips 2 rear,( That totals the two strips in the rear top and bottom) The front cap strips are (2) 131 3/8 (front top and bottom) , the next strip 102 1/4 (1) front top. The front bottom is 71 1/2. That totals to two strips on back and four strips on front at "B-B" There is no cap strip centered on the splice plate The 61 1/4 dimension locates the 3/16 holes for the flap and aileron drive linkage

[Flytaildragger]

Everything you are looking at is correct except B and C view.
The arrows are only there to show from what angle to view it from which is from inboard and only at that point no further so B view dose not extend any further than #4 rib And C view is only at rib# 6.
Rib5 is not in B view which is the second cap you are referring to and is shown in C view.
If you were to cut the spar at a b or c point and look only at the cut spar/cap ends that’s what you would see.aa bb cc
Hope this clarifies.

[fairchild]

PF--- when I said "centered- on the splice plate-" I was meaning in the inboard-outboard direction. Notice the outer (topmost in stack) rear cap strip has about equal lengths on either side of the splice plate.

FlyTail---- Yes that helps A LOT. Knowing that the "section is just a one point and not a "range" of locations. And the arrow is so you are not looking at it backwards. Yes- rib location 5 has double caps where as #4 only has a single yayer of caps. I think its consistent now for me.

Thanks yall--- that gets me un-stuck ! :-)
Tim