Replies to This Discussion

Permalink Reply by Matt Heintz on December 9, 2009 at 11:28pm

Ken,
The important thing is that 6-ZU-1-2 set to the spar as shown in the drawing 6-ZU-1. It is 100% bolted in place and the ribs need to fit around that. However, I will see if we can give more instructions on the older 4 rib installation.

Permalink Reply by Larry Whitlow on December 9, 2009 at 4:55pm

Matheiu

I see that new drawings dated 9 Dec 2009 are up at

http://www.zenithair.com/news/ntsb-astm-4-09a.html

and they are not marked with the DRAFT notation. Are these the final drawings??

Larry

Permalink Reply by Matt Heintz on December 9, 2009 at 11:30pm

Larry,
You are 100% correct. Zenith is satisfied that the drawings will work. Yes, there are still a few errors that will have to be corrected but with the drawings, you can complete the upgrade.

Permalink Reply by Alan on December 9, 2009 at 5:38pm

Is doubling up of rivets on Extrusion 6-ZU-1-1 still needed, at 20mm spacing on top and bottom skins as per the blogs .Couldn't see it on the drawings Cheers Alan

Permalink Reply by Doug Sire on December 9, 2009 at 7:09pm

Drawing 6-ZU-3 still shows this.

Permalink Reply by Alan on December 9, 2009 at 8:50pm

Found the answer Cheers Alan

Permalink Reply by Matt Heintz on December 9, 2009 at 11:32pm

Alan,
Yes, still required. Note is on drawing 6-ZU-3, top right area.

Permalink Reply by Matt Heintz on December 9, 2009 at 11:46pm

Comment on solid rivets.
Some are concerned that if you are not familiarized with solid riveting thick type structures, you may not be properly setting the rivets.
This is an important comment and I strongly recommend that anyone who is not 100% confident must get assistance from an A&P mechanic etc.
Using a strong type rivet gun and larger / heavier bucking bar is better. Practicing with scrap material is always an excellent way to see if you can do this.
So please know your limits before starting the riveting.

Permalink Reply by Chris Sinfield on December 10, 2009 at 5:46am

Mathieu
On the final set of plans dated 09 DEC on page 1 in the 6-X-0 Technical Data area, it now shows Ultmate load of -3G. I thought the upgrades strengthened the wing??, So why now with a stronger wing is the Normal Neg Load only 2 G not the -4 as before.
Chris

Permalink Reply by Matt Heintz on December 11, 2009 at 5:44am

Chris,
We are using the +6/-3 because of the SLSA calculations that Chris Heintz did for the SLSA category and FAA. Doing more than -3g loads are just not realistic so Chris Heintz did not do any calculations past that. Also, we are reinforcing the upper spar caps on the wing for +g loads in compression. The bottom spar caps are not reinforced. So to be on the safe side, +6/-3g is VERY conservative.

Also, some of the accident aircraft (especially in Europe and South America) were known to do advanced aerobatics, so we hope that by limiting the g loads, pilots will respect the limitations.

Permalink Reply by Charles L Smith on December 11, 2009 at 8:52am

Some of the accident aircraft especially in South America? I did not hear about these;
Where are the details? Thanks

Permalink Reply by Doug Sire on December 10, 2009 at 11:58am

Mathieu,

One of the items of concern previously mentioned by the FAA in the SAIB was "stick force characteristics", or pitch sensitivity in certain areas of the flight envelope. Will there be anything forthcoming in the upgrade kit to address that?

Thanks,
Doug Sire

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