On Wed, 5 Aug 2009 08:41:55 -0700 (PDT), Mike
wrote:

On Aug 5, 9:34*am, Stealth Pilot
wrote:
On Wed, 5 Aug 2009 05:19:21 -0700 (PDT), mhorowit
wrote:



* I’m trying to understand Figures 4.45, and have a question about a
technique shown in 4.44.

* First, 4.44 – here they show fabricating an inner tube by cutting,
reforming and welding outer tube material. Is there any reason this
can’t be done with round tubing if one can’t locate the correct size
inner tubing for an internal splice?



Hi Stealth - thanks for the reply. In the first example I apparently
wasn't clear - I was generalizing from one example to another.
In other words, if you can cut/form/weld using streamlined tubing, is
there any reason I can't cut/form/weld for round tubing? - Mike

there no reason at all. it is the wall thickness that matters not how
it was formed. just dont hurry the work do it neatly.

on my Auster we didnt have round tubing so the repair was formed from
flat sheet. heated to red heat 4130 becomes quite plastic and is
easily formed.

if you ever get to see the back end of a bucker jungman (rudder and
fin) you'll see beautifully tapered tubes all formed by taking a slice
out of the tube and then beating it down almost conical. beautiful
stuff.

Stealth Pilot