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Permalink Reply by James Cameron on October 28, 2013 at 6:46pm

Ronald,

Are you talking about part # 75W4-1 (L/R Nose) ?  or 75W4-2 (L/R Rear rib)? I don't see any revisions to that part throughout the 3 editions.  The tables for both parts are both labeled as "Root Nose Rib Form Block", which may be leading to the confusion.  The one on the right (712 mm long) should  have been labeled "Root Rear Rib".

Have you worked with charts that had two Y axes? (Y1 and Y2)  That could also be were the plans were misinterpreted.  On the rear root rib there is a curve on the top and the bottom, which is why you need two Y axes.

The flange is also angled at 30 degrees.

Could you explain a bit more about what doesn't look right?

James

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Permalink Reply by ronald zielke on October 29, 2013 at 11:29pm

the part is 75w4-1,  when I lay out ,using the coordinates on the plan nothing seems to work    it is to long and has dip in the top cord.  but looking at the thread it seems that everybody is remaking that rib. I guess that is why they call us the manufactures,  in the thread they are talking about fitting the nose skin that is predrilled but you can see by the pictures that they have all remade the rib 75w4-1   I'm interested in your thoughts  thanks   Ron

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Permalink Reply by Clint L Gosch on October 28, 2013 at 9:31pm

Hi Ronald, I noticed a couple things when I put mine together.  First thing was the x=45 point does not meet up with the 27mm radius, I connected the two with a line that blended into both curves (draw a curved line tangent to both curves). I confirmed this is normal with the factory.  Second issue noted was with the rear root rib form block placed in line with the root nose rib, the top curve of the rear rib will not blend smoothly to the nose rib, according to the factory this is normal, I looked at the factory demo plane and sure enough, you can see the transition in the root skin, does not look bad enough to force me to change anything.  The root rear rib changed in edition 3 to provide added headroom, the previous rear rib curve matched up better with the nose.  Hope this helps, if not let me know.  Thanks,  Clint

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Permalink Reply by ronald zielke on October 29, 2013 at 11:42pm

Hi Clint, that's pretty much the same thing I have done. have you or are you  going to install the root skins or  as you build the wing or put them on when the wing is installed?   A question not related to this,  when you riveted the top and bottom spar caps, did you alternate between top and bottom or finish one cap and go on to the next? thanks again for all the help.  Your pictures have been a real help.  ron

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Permalink Reply by Clint L Gosch on October 30, 2013 at 10:13am

Hi Ron,  I plan to fit the root skins when the wing is attached to the fuselage.  When riveting the spars, I cleco'd every other hole in both the top and bottom spar caps, riveted the open holes on the top and bottom, removed clecos and went around again.  I see no issue with completeing one whole side before you do the other, my method just seemed to make sense to me at the time.  Good luck!

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Permalink Reply by Joe Harrington on October 29, 2013 at 8:01pm

This thread may have some pertinent and useful info: http://www.zenith.aero/group/stolch750/forum/topics/wing-root-skins

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Permalink Reply by ronald zielke on October 29, 2013 at 11:45pm

thanks Jo it really does help

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