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XL wing concerns
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europa2



Joined: 22 Dec 2008
Posts: 2

PostPosted: Mon Dec 22, 2008 3:34 pm    Post subject: XL wing concerns Reply with quote

Mine is one of 17 odd XL’s grounded by the LAA in UK. There is a feeling that both Chris and Michael Heintz are reluctant to respond to our LAA’s observations on the airframe? Do they intend to engage with them, thereby speeding up the investigation and hopefully, get the aircraft released for flight?
Our concern is that the eventual outcome might be severe restrictions in the flight envelope; effectively reducing it to a single seater, limited in both range and payload! The aircraft’s resale value would be greatly reduced, and I believe buyers would shun away from it………

Come on Chris!


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PostPosted: Mon Dec 22, 2008 3:47 pm    Post subject: XL wing concerns Reply with quote

David,

Who did you buy your plane from? Surely, Michael
Heintz had nothing to do with it in any way. Why
do you think he or Chris should come to your defense?

If you bought your plane from Czech Aircraft
Works, then you have a real problem since, as I
understand it, they have gone bankrupt. If it
was from Zenith, Zenair, or AMD, then you should
be directing your complaints to them.

Where ever did you folks get the notion that the
Heintzs were responsible for your government's actions?

Paul
Camas, WA
USA
At 03:34 PM 12/22/2008, you wrote:
Quote:
Mine is one of 17 odd XL’s grounded by the LAA
in UK. There is a feeling that both Chris and
Michael Heintz are reluctant to respond to our
LAA’s observations on the airframe? Do they
intend to engage with them, thereby speeding up
the investigation and hopefully, get the aircraft released for flight?
Our concern is that the eventual outcome might
be severe restrictions in the flight envelope;
effectively reducing it to a single seater,
limited in both range and payload! The
aircraft’s resale value would be greatly
reduced, and I believe buyers would shun away from it………

Come on Chris!javascript:emoticon('Rolling Eyes')


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Martin Pohl



Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland

PostPosted: Tue Dec 23, 2008 12:32 am    Post subject: Re: XL wing concerns Reply with quote

Paul,

Quote:
If you bought your plane from Czech Aircraft
Works, then you have a real problem since, as I
understand it, they have gone bankrupt.


Just to make things clear: CZAW was the official contractor for Zenair until the end of 2006, i.e. all Zenair CH601XL-kits for Europe were delivered through CZAW.

I contacted Zenair US in autumn 2005 to order my CH601XL and was redirected by them to CZAW ("kits in Europe are solely sold through CZAW"). However my serial number is a real Zenair number and my kit is a real Zenair kit.

Martin


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Zodiac XL QBK
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http://www.pohltec.ch/ZodiacXL/Main.html
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PostPosted: Tue Dec 23, 2008 2:48 am    Post subject: XL wing concerns Reply with quote

Hi Martin,

Thanks for writing and clearing up my misunderstanding.

Does the relationship between Zenair and CZAW mean you can get
warranty service from Zenair?

Also, I understood the European model XLs have several significant
differences from the other ones. The only one I can identify is the
landing gear being composite rather than solid aluminum. I thought
there were empty weight and possibly gross weight differences as well.

Paul


At 12:32 AM 12/23/2008, you wrote:
Quote:


Paul,
> If you bought your plane from Czech Aircraft
> Works, then you have a real problem since, as I
> understand it, they have gone bankrupt.
Just to make things clear: CZAW was the official contractor for
Zenair until the end of 2006, i.e. all Zenair CH601XL-kits for
Europe were delivered through CZAW.

I contacted Zenair US in autumn 2005 to order my CH601XL and was
redirected by them to CZAW ("kits in Europe are solely sold through
CZAW"). However my serial number is a real Zenair number and my kit
is a real Zenair kit.

Martin

--------
Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland


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europa2



Joined: 22 Dec 2008
Posts: 2

PostPosted: Tue Dec 23, 2008 3:29 am    Post subject: Re: XL wing concerns Reply with quote

It should be stressed that the CZAW production of Zenair aircraft, whether RTF or kit, were built under Zenair licence.
However, at the end of 2006 Zenair and Czech Aircraft works (CZAW) mutually agreed to discontinue the manufacture of Zenair aircraft by CZAW .
The build plans of the CZAW supplied XL kit, has Chris Heintz's copyright on the bottom of each page. Therefore, with regards to accidents involving the Zenair type aircraft, it is appropriate that Chris is involved in discussion with the appropriate aviation authority.


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david_a_g_johnson(at)btin
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PostPosted: Tue Dec 23, 2008 3:35 am    Post subject: XL wing concerns Reply with quote

I've been 'sitting on the sidelines' watching the exchanges that have been
flying around!

Now I'm sticking my head above the parapet.

I'm in the UK, I bought my 601XL kit from CZAW, as they were the European
agents for Zenith.

Quote:
From my experience, it is impossible to get any kind of support from Zenith,
they just don't want to know.


My kit is virtually finished - ready for the final inspections before test
flying - and now it's grounded, so you can imagine I'm really happy!!!!

The drawings that came with the kit were the full Zenith set, as far as I
know exactly the same as you get in the USA. Wherever there is a difference,
there is an additional page showing the differences, so it is easy to see
how different the CZAW kit is.

As Paul said, the kit includes the composite U/C legs, but virtually all the
other changes are very minor - things like the rudder turnbuckles are at the
front, near the pedals, rather than at the rear.

The only significant change that I am aware of is that they have changed the
angle of incidence of the wing by lowering the rear attachment point, but no
structural change there.

I have not been able to find any structural difference, the specified
thicknesses for the skins, ribs, etc. are all the same in the 2 sets of
drawings.

Mine is the VLA version with a MTOW of 560Kgs, there is a 'microlight'
version which is limited (by the definition of a microlight) to 450Kgs and I
think that may (but I'm not sure) make use of thinner metal in some areas.

Dave Johnson

Oxfordshire - in the UK

601XL with Jab. 3300

do not archive (or flame - I forgot my asbestos pants!!)

---


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PostPosted: Tue Dec 23, 2008 3:49 am    Post subject: XL wing concerns Reply with quote

David,

Chris has indeed been involved in accident investigations and
supplemental structure testing for the XL. He has also issued some
letters recommending actions by XL builders/owners. In particular,
he has suggested a need to keep control cables tensioned
properly. He has also mentioned that the design trade-off giving
very good pitch control at low speeds has made it possible to cause
damage with abrupt stick inputs at high speeds - particularly in the
negative G direction.

On the other hand, I understand Chris has been retired (in France)
for several years now. I know there have been a number of
engineering changes made to the XL since he retired. I must conclude
there have been other engineers making design changes even though the
drawings still show only his name.

There are a number of engineers familiar with the XL design. They
have been readily available for builder assistance, and I presume
there has been plenty of engineering support for the various
government led accident investigations. The only comments I have
seen suggesting lack of engineering support for those investigations
have come from people too ashamed of their identities to include
their names along with their comments.

Paul
Camas, WA USA
At 03:29 AM 12/23/2008, you wrote:

Quote:
It should be stressed that the CZAW production of Zenair aircraft,
whether RTF or kit, were built under Zenair licence.
However, at the end of 2006 Zenair and Czech Aircraft works (CZAW)
mutually agreed to discontinue the manufacture of Zenair aircraft by CZAW .
The build plans of the CZAW supplied XL kit, has Chris Heintz's
copyright on the bottom of each page. Therefore, with regards to
accidents involving the Zenair type aircraft, it is appropriate that
Chris is involved in discussion with the appropriate aviation authority.


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PostPosted: Tue Dec 23, 2008 4:08 am    Post subject: XL wing concerns Reply with quote

Hi David,

After several years on this list and working daily on my own XL I am
still confused by the various companies and people involved with this
design. It seems I am not the only one.

Recent posts have claimed CZAW was an agent for both Zenith and
Zenair. These are two completely different companies which exist in
two different countries. Zenair is the Canadian company that
produces parts and kits designed originally by Chris Heintz and
Zenith Aircraft Company is a USA company that also sells some of
those same designs. I know there is a close relationship of some
sort between Zenith and Zenair since I had to wait for Zenair to make
a new wing spar for shipment to Zenith when I ordered a replacement
wing kit. The remaining wing kit parts were manufactured at
Zenith. I strongly suspect there never was a relationship between
CZAW and Zenith but there was some sort of licensing agreement
between CZAW and Zenair.

I don't really understand the relationship between CZAW and either of
the companies mentioned above. However, I don't believe they acted
as an agent for them. Rather, I think CZAW produced airplanes based
on the same CH designs (at least in some cases) and sold them
primarily in Europe. I am also aware of at least one CZAW XL that
was sold as a complete airplane to a list member in Virginia.

There is similar confusion over the various members of the Heintz
family. Chris is the original designer for the CHxxx line of
aircraft. He is currently retired. He has 4 sons who currently make
their fortune working with his designs. Sebastian Heintz and
Nicholas Heintz both work for Zenith Aircraft Company in Mexico,
Missouri. Michael Heintz is involved with a California company that
acts as an agent for Zenith. There is another one whose name I can't
quote who is involved with AMD in Georgia.

Let me apologize if I am still confused over the various company
names and locations and various members of the Heintz family involved
with those companies. Some times I suspect they went out of their
way to keep their customers confused over these questions.

Paul
XL getting close
Camas, WA USA
At 03:35 AM 12/23/2008, you wrote:

Quote:
I'm in the UK, I bought my 601XL kit from CZAW, as they were the
European agents for Zenith.



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aerobat



Joined: 07 Nov 2008
Posts: 21
Location: UK

PostPosted: Tue Dec 23, 2008 5:06 am    Post subject: Re: XL wing concerns Reply with quote

None of the UK CH601XLs are microlights, they all have MTOW of 560kg apart from two that appear to be 590kg.
My own XL came from CZAW complete with it's detailed build drawings that have ZENITH AIRCRAFT in bold print, all rights reserved design by CHRIS HEINTZ and copyright 2002 Chris Heinz on every sheet apart from the few CZAW modifications ie undercarriage.


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skyguynca



Joined: 05 Jun 2006
Posts: 128

PostPosted: Tue Dec 23, 2008 5:27 am    Post subject: XL wing concerns Reply with quote

Wow, I usually stay out of this stuff but come one guys. I have see 5 of you
flame people, swearing there are differences between European and US XL's,
then flame saying "your problem is with CZAW not Chris Heinz!" With all of
this bickering I have see the US "Zenith is Magnificant and Perfect"
attitude to a embarrassing point. You guys were wrong with your statements
and when it was pointed out by other European owners you accepted it but
after the brutal tongue bashing you gave the least you can do is admit you
are wrong and APOLOGIZE.

Yeah go ahead and flame me, I only have a few posts here. Yeah I sold my
601HD along time ago, but I bought a new set of plans and will build a new
601HD when I get around to it, but please don't let that stop you flame me
too, it seems to be all you can do.

You guys forget, this is a builders list. It is here for builders and if
they have a problem this is the place to vent. Remember we are supposed to
be supportive, not DEFENSIVE. None of us designed or sold Zenair, Zenith,
CZAW or AMD products, but we all own or are building them. I have great
compassion for the guys in Europe who are grounded. I can understand their
anger and frustraition.

What should have been said to the aerobat and the others who posted:

Wow, that is news to me. Well if it is true hopefully it will get worked out
soon. Being here in the USA we do not hear the same things, we can only read
what is posted by Zenith. Where did you get your information? Is your plane
built? Or still working on it?

Well something to that effect, you get the idea. Instead what I saw was a
immeadiate verbal attack to a fellow builder who has problems beyond his
control and who is very frustraited and needed support and a positive
response.

Well you guys, it is close to Christmas and to a bright new year. Lets try a
little friendship to people we don't know. Who knows someone might even show
you the same when you need it.

David M.
Petaluma CA
--


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aerobat



Joined: 07 Nov 2008
Posts: 21
Location: UK

PostPosted: Tue Dec 23, 2008 5:41 am    Post subject: Re: XL wing concerns Reply with quote

Excellent post Skyguy. Merry Christmas to you and your family.
Happy flying.


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PostPosted: Tue Dec 23, 2008 6:35 am    Post subject: XL wing concerns Reply with quote

thank you Dave. Have a blessed Christmas and a satisfying new year.

David L. Downey
Harleysville (SE) PA, USA


--- On Tue, 12/23/08, skyguynca(at)skyguynca.com <skyguynca(at)skyguynca.com> wrote:
[quote]From: skyguynca(at)skyguynca.com <skyguynca(at)skyguynca.com>
Subject: RE: Re: XL wing concerns
To: zenith601-list(at)matronics.com
Date: Tuesday, December 23, 2008, 8:25 AM

[quote]--> Zenith601-List message posted by: <skyguynca(at)skyguynca.com>

Wow, I usually stay out of this stuff but come one guys. I have see 5 of you
flame people, swearing there are differences between European and US XL's,
then flame saying "your problem is with CZAW not Chris Heinz!" With
all of
this bickering I have see the US "Zenith is Magnificant and Perfect"
attitude to a embarrassing point. You guys were wrong with your statements
and when it was pointed out by other European owners you accepted it but
after the brutal tongue bashing you gave the least you can do is admit you
are wrong and APOLOGIZE.

Yeah go ahead and flame me, I only have a few posts here. Yeah I sold my
601HD along time ago, but I bought a new set of plans and will build a new
601HD when I get around to it, but please don't let that stop you flame me
too, it seems to be all you can do.

You guys forget, this is a builders list. It is here for builders and if
they have a problem this is the place to vent. Remember we are supposed to
be supportive, not DEFENSIVE. None of us designed or sold Zenair, Zenith,
CZAW or AMD products, but we all own or are building them. I have great
compassion for the guys in Europe who are grounded. I can understand their
anger and frustraition.

What should have been said to the aerobat and the others who posted:

Wow, that is news to me. Well if it is true hopefully it will get worked out
soon. Being here in the USA we do not hear the same things, we can only read
what is posted by Zenith. Where did you get your information? Is your plane
built? Or still working on it?

Well something to that effect, you get the idea. Instead what I saw was a
immeadiate verbal attack to a fellow builder who has problems beyond his
control and who is very frustraited and needed support and a positive
response.

Well you guys, it is close to Christmas and to a bright new year. Lets try a
little friendship to people we don't know. Who knows someone might even
show
you the same when you need it.

David M.
Petaluma CA
--


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carlossa52(at)gmail.com
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PostPosted: Tue Dec 23, 2008 6:48 am    Post subject: XL wing concerns Reply with quote

Well said, David !
Merry Christmas and a Great New Year !
Carlos
CH601-HD, plans

do not archive

2008/12/23 <skyguynca(at)skyguynca.com (skyguynca(at)skyguynca.com)>
[quote]--> Zenith601-List message posted by: <skyguynca(at)skyguynca.com (skyguynca(at)skyguynca.com)>

.. Instead what I saw was a
immeadiate verbal attack to a fellow builder who has problems beyond his
control and who is very frustraited and needed support and a positive
response.

Well you guys, it is close to Christmas and to a bright new year. Lets try a
little friendship to people we don't know. Who knows someone might even show
you the same when you need it.

David M.
Petaluma CA[b]


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jmaynard



Joined: 27 Feb 2008
Posts: 394
Location: Fairmont, MN (FRM)

PostPosted: Tue Dec 23, 2008 6:54 am    Post subject: XL wing concerns Reply with quote

On Tue, Dec 23, 2008 at 04:07:00AM -0800, Paul Mulwitz wrote:
Quote:
There is similar confusion over the various members of the Heintz family.
Chris is the original designer for the CHxxx line of aircraft. He is
currently retired. He has 4 sons who currently make their fortune working
with his designs. Sebastian Heintz and Nicholas Heintz both work for
Zenith Aircraft Company in Mexico, Missouri. Michael Heintz is involved
with a California company that acts as an agent for Zenith. There is
another one whose name I can't quote who is involved with AMD in Georgia.

That's Mathieu Heintz.

Who runs Zenair in Canada? I know that AMD gets quick build kits from them
for completion and sale, as I watched two of them being delivered while I
was at the AMD factory to take delivery of my airplane. Is that where Zenith
gets their quick build kits, or do they start from parts and do their own
assembly? I'd thought that Zenith was, basically, the US distributor for
Zenair.
--
Jay Maynard, K5ZC, PP-ASEL http://www.conmicro.com
http://jmaynard.livejournal.com http://www.tronguy.net
Fairmont, MN (KFRM) (Yes, that's me!)
AMD Zodiac CH601XLi N55ZC http://www.tronguy.net/N55ZC.shtml


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jmaynard



Joined: 27 Feb 2008
Posts: 394
Location: Fairmont, MN (FRM)

PostPosted: Tue Dec 23, 2008 7:22 am    Post subject: XL wing concerns Reply with quote

On Tue, Dec 23, 2008 at 07:13:03AM -0800, Sabrina wrote:
Quote:
When your LAA, through a former Zenith dealer, takes the time to
repeatedly contact a 15 year old girl in the U.S. about the addition of SS
A5 rivets on the inboard ailerons aft hinge portion attach points and
requests more information each time, it means only one thing, they are
very thorough.

It also means the 15-year-old in question has earned a significant amount of
respect as an aeronautical engineer. Personally, I think it's well-deserved.

Quote:
The AMD XLi and the Sabrina roll out at 850 pounds empty.

My AMD XLi did, but it's one of the heavier ones due to the level of
equipment installed. AMD's aircraft tend to be in the 750-800 pound range
with more usual levels of equipment, or 790-850 with BRS parachutes (which
mine does not have).

Quote:
As the Germans recently pointed out, how in the world do you EU CZAW
owners get your aircraft to come in at the required EU weights?

This is a really good question, to which I've never heard a definitive
straight answer.
--
Jay Maynard, K5ZC, PP-ASEL http://www.conmicro.com
http://jmaynard.livejournal.com http://www.tronguy.net
Fairmont, MN (KFRM) (Yes, that's me!)
AMD Zodiac CH601XLi N55ZC http://www.tronguy.net/N55ZC.shtml


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PostPosted: Tue Dec 23, 2008 7:25 am    Post subject: XL wing concerns Reply with quote

Jay,

I know that Zenith Aircraft Company in Mexico MO does manufacture parts. I have observed their CNC routers making skins and actual people making wing ribs and fabricating and welding various 4130 steel assemblies. Obviously, they don't make engines, flap actuators, wheels and brake assemblies, strobe/nav light sets and such. I know that wing spars are made elsewhere. I really don't know where the assembly of the ready-to-go quick build kit components is done. Sebastian runs the Mexico facility and Nick is now in Europe.

Jay in Dallas
Do not archive





--


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bryanmmartin



Joined: 10 Jan 2006
Posts: 1018

PostPosted: Tue Dec 23, 2008 8:26 am    Post subject: XL wing concerns Reply with quote

There may have been a change to the later versions of the Zenith plans
where .016 skins have been changed to .025. In my early plans, every
skin aft of the cabin area is .016 and so are the ailerons, all the
other skins are .025.

Some people were concerned about oil canning on the aft fuselage area
and were considering using .025 or .020 instead of .016. I think that
Zenith approved that modification. I seem to recall that Zenith may
have changed the plans to include thicker skins on the aft fuselage
area. How thick is the aluminum in that area on your plans? If there
was a change in the plans, maybe the CZAW planes were built from
earlier plans.

I recall some builders were considering using the thicker aluminum
because .016 was not readily available in their region. The only down
side I can see of using thicker skins on the aft fuselage would be the
extra weight and a small change in the CG that would need to be taken
into account. On the other hand, using thicker skins on the control
surfaces could have serious consequences.
Quote:


<chicago2paris(at)msn.com>

I have been sent photos showing .016 skin thicknesses on some CZAW
aircraft kits where Zenith plans spec .025 Are there static tests
of the .016 CZAW aircraft anywhere to be had?


--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.


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--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
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PostPosted: Tue Dec 23, 2008 8:46 am    Post subject: XL wing concerns Reply with quote

FYI: My 601 HD plans has .016 for the Rear Top and Rear Bottom skin at .016" (Ref: 6V-8 drawing dated 04/01) as well at the Wing Nose Skin and Wingtip Rear Top Skin ( Ref: 6V-9 dated 01/02) Jerry of Georgia





In a message dated 12/23/2008 11:30:39 A.M. Eastern Standard Time, bryanmmartin(at)comcast.net writes:
Quote:
--> Zenith601-List message posted by: Bryan Martin <bryanmmartin(at)comcast.net>

There may have been a change to the later versions of the Zenith plans
where .016 skins have been changed to .025. In my early plans, every
skin aft of the cabin area is .016 and so are the ailerons, all the
other skins are .025.

Some people were concerned about oil canning on the aft fuselage area
and were considering using .025 or .020 instead of .016. I think that
Zenith approved that modification. I seem to recall that Zenith may
have changed the plans to include thicker skins on the aft fuselage
area. How thick is the aluminum in that area on your plans? If there
was a change in the plans, maybe the CZAW planes were built from
earlier plans.

I recall some builders were considering using the thicker aluminum
because .016 was not readily available in their region. The only down
side I can see of using thicker skins on the aft fuselage would be the
extra weight and a small change in the CG that would need to be taken
into account. On the other hand, using thicker skins on the control
surfaces could have serious consequences.
Quote:

--> Zenith601-List message posted by: "Sabrina"
<chicago2paris(at)msn.com>

I have been sent photos showing .016 skin thicknesses on some CZAW
aircraft kits where Zenith plans spec .025 Are there static tests
of the .016 CZAW aircraft anywhere to be had?


--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
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PostPosted: Tue Dec 23, 2008 8:53 am    Post subject: XL wing concerns Reply with quote



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Martin Pohl



Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland

PostPosted: Tue Dec 23, 2008 10:20 am    Post subject: Re: XL wing concerns Reply with quote

May I correct this one:
Quote:
CZAW did this 2" down--2 degree decalage change by TWISTING the main spars rather than re-setting the main carry through spar... Can the LAA find any static testing of this new twisted main spar anywhere in CZAW's books?


The CZAW CH601XL has the main carry through spar reset by 2°. The wings/main spar angles of the wings are similar to the Zenith version.

The UK LAA has static wing loading tests of the CZAW CH601XL done by CZAW. The wings were tested all the way to wing failure.

Cheers and Merry Christmas
Martin


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