ulflyer(at)verizon.net
Guest
|
 Posted: Wed Feb 06, 2008 12:54 am Post subject: Fwd: Re: 5 in. Tubing - Reposting a old Post - Might be us |
 |
|
| Quote: | Date: Wed, 05 Sep 2001 00:53:52 -0500
To: kolb-list(at)matronics.com
Subject: Re: 5 in. Tubing
Sender: owner-kolb-list-server(at)matronics.com
Reply-To: kolb-list(at)matronics.com
X-Airmail-Delivered: Wed, 5 Sep 2001 00:54:02 -0500 (CDT)
X-Airmail-Spooled: Wed, 5 Sep 2001 00:53:50 -0500 (CDT)
If I recall right the source they used for the larger dia. tubing was an
aluminum company in AZ. Yes it was irrigation pipe. I used to have the
name of it and the source of the rivets they used. As for strength why
change what has withstood the test of time and proven its self to
work. Kolb are good airplanes, why mess with what isn't broke.
At 10:35 PM 9/4/01 -0400, you wrote:
>
>
>Just wanted to make a couple comments about the 5 in. boom / spar tube that
>comes up every so often, I believe the tube referred to as Irrigation pipe
>is 6063-T8 and not T6 , I have a couple 10 ft. lengths and took a sample to
>work for a simple tensile break test, sample was 5 in. O.D. X .050 in. wall
>and it broke at between 37,000 and 41,000 PSI, not too bad for water pipe .
> The cost of this pipe or tube is approx. $5.00 per ft. and it is sold in
>20 ft. lengths , Wick's was mentioned as a source , they sell 5 in. X .065
>wall for approx. $20.00 per ft. and weight is 30% more also,comes in 12ft.
>length.
> Am not an engineer but have always wondered why the Kolb
attach point for
>wing / strut was at the mid point of wing panel and not at 66% as most AC
>are located, would appear that H section would allow spar to elongate under
>heavy load , have also thought that H section could be extended to a length
>of 36 or 40 in. and made into a truss to spread load over larger area.
> Guess one can"t argue with success but after smashing some of this tube
>to pieces , it still looks fragile .
> Thanks for listening
> Phil Lohiser
> EAA 12873
>
|
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
