Today's Message Index:
----------------------
1. 04:53 AM - Re: Re: Use of 7075-T-6 for wing attach fittings? (Walter Carey)
2. 05:08 AM - Re: Use of 7075-T-6 for wing attach fittings? (Walter Carey)
3. 05:49 AM - Re: Use of 7075-T-6 for wing attach fittings? (David Downey)
4. 02:41 PM - 601 HDS - how fast is it really (heisan)
5. 04:08 PM - Re: 601 HDS - how fast is it really (LarryMcFarland)
6. 05:49 PM - Re: Use of 7075-T-6 for wing attach fittings? (Walter Carey)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Use of 7075-T-6 for wing attach fittings? |
Hi Larry,
Really like the idea of the cool bar in the basement. Walt in Ohio.
Larry Hursh <skyridersbn@yahoo.com> wrote:
Yes, I can get them out of the basement.
Had to smile at that! I'm also building mine in the basement, with basically
the same plan. My response is "Well, I'll either get it out, or end up with a
really cool bar in the new rec room!"
.....There's only one word that comes to my mind:
Sawsall....LOL
Larry Hursh
CH601XL (Building from Kits - Rudder, tail sections done, working on wings)
(N601LL Reserved)
Edwardsburg, Michigan
Keep your eyes skyward - always!
Do Not Archive
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Use of 7075-T-6 for wing attach fittings? |
Thanks for the info Jim. Maybe I'll just double up on the backing plate for the
rear center spar and the wing attachment plates using .063 6061 T-6 aluminum.
Retired from the AF in 1979 as CMSgt and 1998 as GM-14. In the AF, worked five
years in electronics, five years as B-52 gunner, two years in field maintenance,
and 10 years in OSI. As civilian, worked another 18 years on OSI. Any thoughts
on the suspected wing failures? Walt.
Jim Machin <Jim.Machin@uav.com> wrote: Walt,
7075 material, in general, is very susceptible to stress corrosion cracking and
is prohibited from being used on any military programs. On our aircraft (I
design UAV aircraft, Predator series) for the Air Force, we have had to substitute
7050 for all the parts that were originally 7075 as we had seen some premature
corrosion problems on some very well corrosion-protected parts (anodized
and painted). The corrosion process is accelerated when the material is continually
stressed as in landing gear while the aircraft is sitting on the ground
(which is where we saw problems). While being much stronger than 2024 or 6061,
7075 really is not a good choice of material. If the higher material properties
are required, 7050 can be used but it is very expensive.
Jim
Quickbuild 601XL, 0-200
-----Original Message-----
From: owner-zenith601-list-server@matronics.com [mailto:owner-zenith601-list-server@matronics.com] On Behalf Of Walter Carey
Sent: Friday, May 23, 2008 2:33 PM
Subject: Zenith601-List: Use of 7075-T-6 for wing attach fittings?
Hi,
New to the site. Building in basement in Beavercreek, Ohio, just outside
of Dayton. Both wings, control surfaces and flaps complete. Yes, I can get them
out of the basement. Fuselage 50 % complete, held together by Clecoes. Once
complete, will disassemble and move to garage where fuselage will be aligned again
and riveted together. Not new to aviation or aircraft maintenance, especially
sheet metal work.
Question: Has anyone used, or thought about using 7075 T-6 Alclad .063 aluminum
as a backing plate on the rear center spar running thru the fuselage, and
as attachment plates between the rear center spar and the wing rear spar? 7075
T-6 is a high strength aluminum designed for use in high stress areas. I would
like to do this as I am in agreement with several readers who have suggested
that recent wing failures COULD have been the result of the failure of the rear
spar attach plates. My thought is that until the NTSB comes up with a reason
and a fix, why not add extra strength in that area. The added weight is minimal.
Any comments?
Walt
http://www.matronics.com/Navigator?Zenith601-List
http://forums.matronics.com
http://www.matronics.com/contribution
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Use of 7075-T-6 for wing attach fittings? |
just remember that 7075T6 is also very much more susceptible to corrosion that
the others and is also quite notch sensitive - for instance the scratches across
the thickness of the part from inserting the bolts are stress risers that are
usually ignored in other alloys/tempers but need to be considered in 7075.
Walter Carey <careywf@sbcglobal.net> wrote: Hi,
New to the site. Building in basement in Beavercreek, Ohio, just outside of
Dayton. Both wings, control surfaces and flaps complete. Yes, I can get them
out of the basement. Fuselage 50 % complete, held together by Clecoes. Once complete,
will disassemble and move to garage where fuselage will be aligned again
and riveted together. Not new to aviation or aircraft maintenance, especially
sheet metal work.
Question: Has anyone used, or thought about using 7075 T-6 Alclad .063 aluminum
as a backing plate on the rear center spar running thru the fuselage, and as
attachment plates between the rear center spar and the wing rear spar? 7075
T-6 is a high strength aluminum designed for use in high stress areas. I would
like to do this as I am in agreement with several readers who have suggested
that recent wing failures COULD have been the result of the failure of the rear
spar attach plates. My thought is that until the NTSB comes up with a reason
and a fix, why not add extra strength in that area. The added weight is minimal.
Any comments?
Walt
David L. Downey
Harleysville (SE) PA, USA
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | 601 HDS - how fast is it really |
Hi again,
I am still busy researching the 601 HDS before building. While browsing the net,
I see very few people getting anywhere near the cruise speed mentioned on the
Zenith website (135mph cruise on Rotax 912).
Would it be possible to get some real speeds measured by builders/pilots please?
I would like to know IAS and alltitude, as well as what engine is in the aircraft.
Also, I saw a note on one website that their is a 'new' HDS wing that is thinner
and faster. The web site dates from the early 2000's though. Is this true? If
so, what plan numbers include the new wing?
Thanks!
Justin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=184670#184670
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 601 HDS - how fast is it really |
Hi Justin,
I doubt there are any HDSs with the 912 seeing those numbers. That
said, the HDS is capable of decent speeds when the prop is pitched long,
it has the proper fairings and the plane is lightly loaded at an
altitude of over 3500 feet. My Stratus Subaru with the prop pitched at
17-degrees and the 9-1/2 gallon header tank full and just me in the
plane, can easily be trimmed out to reach 133 mph at 5000 rpm. At 4600
rpm it does a 120 mph cruise and fully loaded, it complies with the LSA
performance standard for stall speed. If you want to go faster, though,
you'll only have to go with a Corvair or a Jabaru 3300. It will climb
at 1000 fpm lightly loaded as described as the Stratus does deliver 100
h.p.as well as any other 100 h.p. engine on 87-octane or 100 LL.
I don't believe there ever was a thin HDS wing. The HDS is faster than
the HD, but if you seriously need real lift and climb, you need to go
with the HD wing. There's a considerable difference between the two. To
climb half as well as the HD, I'd have to bring the pitch from 17 back
to 15 degrees and then the speed would be compromised.
Curious you'd build an HDS when the XL is the latest aircraft in the
Zenith series. Aside from the heavy landing gear spring, it's a great
airplane, easy speed, flaps etc.
Larry McFarland 601HDS at www.macsmachine.com
heisan wrote:
>
> Hi again,
>
> I am still busy researching the 601 HDS before building. While browsing the
net, I see very few people getting anywhere near the cruise speed mentioned on
the Zenith website (135mph cruise on Rotax 912).
>
> Would it be possible to get some real speeds measured by builders/pilots please?
I would like to know IAS and alltitude, as well as what engine is in the aircraft.
>
> Also, I saw a note on one website that their is a 'new' HDS wing that is thinner
and faster. The web site dates from the early 2000's though. Is this true?
If so, what plan numbers include the new wing?
>
> Thanks!
> Justin
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=184670#184670
>
>
>
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Use of 7075-T-6 for wing attach fittings? |
Thanks for the info Dave. Reconsidering use of 7075. Will probably double up on
the 6061 T-6. Thanks again. Walt.
David Downey <planecrazydld@yahoo.com> wrote: just remember that 7075T6 is also
very much more susceptible to corrosion that the others and is also quite notch
sensitive - for instance the scratches across the thickness of the part from
inserting the bolts are stress risers that are usually ignored in other alloys/tempers
but need to be considered in 7075.
Walter Carey <careywf@sbcglobal.net> wrote: Hi,
New to the site. Building in basement in Beavercreek, Ohio, just outside of
Dayton. Both wings, control surfaces and flaps complete. Yes, I can get them
out of the basement. Fuselage 50 % complete, held together by Clecoes. Once complete,
will disassemble and move to garage where fuselage will be aligned again
and riveted together. Not new to aviation or aircraft maintenance, especially
sheet metal work.
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|