I started the right passenger wing skeleton, it seems the factory assembled wing spar has multiple rivets in locations which will need to be drilled out to install nose ribs and rear ribs. Maybe I am missing something or have the wrong spar?
Is this a common occurrence or am I just unlucky?

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Comment by Terrence "Dr. Terry" Hall on December 16, 2016 at 9:25am

I sent that question to Z.

But yes, Gary you are right again, the spar is the same for STOL and Cruzer off the line as of now.

I never looked close enough to STOL to se two struts.

Comment by Gary Reed on December 16, 2016 at 9:02am

The STOL wing has 2 struts per wing and the struts keep the wing from twisting under aerodynamic loads.

When they went with a SINGLE strut for the Cruzer wing, they added extra ribs to increase the twist resistance of the wing.  I think they also increased the thickness of a couple of the wing skins to make it even stiffer to twisting.

My guess about how Dr Terry was able to "Convert" the STOL spars he had is that the spars are actually the same now on the production line and they put on the L Tabs on the STOL version to fill up the empty, none used rivet holes.

Comment by Jonathan Porter on December 16, 2016 at 6:26am

Interesting.... The STOL is a different wing... Perhaps somebody knowing more will enlighten better!

Comment by Terrence "Dr. Terry" Hall on December 16, 2016 at 6:23am

I needed to drill out about thirty rivets in Stol spars to convert to Cruzer spar with 11 nose and 9 rear ribs.

It was cheaper to replace conventional rivets with bolts than cross ship two spars.

The interesting question is why the Stol wing is made different with less ribs than Cruzer?

Comment by Jonathan Porter on December 16, 2016 at 2:16am

So.... how

did you 'convert it' ?

Comment by Terrence "Dr. Terry" Hall on December 12, 2016 at 1:46pm

STol Spar converted to Cruizer spar. And I am moving onward.

Close this blog and thanks for the help.

Comment by Terrence "Dr. Terry" Hall on December 12, 2016 at 6:01am

Brilliant, this is the kind of stunt, they would play in anatomy lab practicals.

Someone would place a dog or pig femur in the human anatomy lab test and no one would know what it was.

Comment by Terrence "Dr. Terry" Hall on December 12, 2016 at 5:51am

Gary Reed:

Thank you, you are a brilliant aviator missile man (to paraphrase some one from "The Martian").

Zenith gave me STOL spars instead of Cruzer spars.

I thought I was going crazy.

Terry Hall

Comment by Gary Reed on December 11, 2016 at 11:59pm

Well, the picture I tried to post of the STOL spars didn't come through.

Go to the STOL webpage

http://www.zenithair.net/building-750stol/

and look at the pictures and diagrams there to see what a STOL spar looks like as opposed to the CRUZER spar.

Comment by Gary Reed on December 11, 2016 at 11:56pm

From your description, the pictures you posted and some of the other pictures I have seen on the Zenith website, I think they gave you a set of STOL spars and you are building a CRUZER; if I don't miss my guess.

The STOL wing has fewer ribs than the CRUZER and those has those L brackets that you have on your spars there, as shown in this schematic from the STOL webpage.

I would call Zenith first thing on Monday.  I think Zenith owes you a set of spars.

Gary Reed

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