WIX Archives
Re: Data Plate restorations v. "original" a/c
Posted by Kenneth on Thu Apr 18, 2002 01:02:36 PM
In reply top Data Plate restorations v. "original" a/c posted by simon king on Thu Apr 18, 2002 12:41:24 PM
I don't think structures would be the main problem in
the future. A structural part in aircraft can theoretically
have an indefinite life. The fatigue life of a structural
part of e.g. aluminium depends on how many cycles the part
is subjected to and at which load. This can be drawn up in
a so-called "Woehler-Diagram", which shows, that if one
remains within a certain envelope, then fatigue will not
be an issue. This, of course, disregards factors such as
corrosion and damage. Moreover, quite a few specialists
are able to reproduce structural parts today. Most
Spitfires flying today, I believe, have been provided with
(at least) new wing spars.
I think the main problems for the continued operation of
vintage aircraft, especially warbirds, lies in consumables,
for example:
(1) Lack of fuel: AVGAS 100LL, practically the only
available aircraft-grade petrol available today, is
attracting quite environmental attraction. "LL" means
"low lead", but as far as I know it actually contains
more lead than 4-star leaded petrol ever did. Moreover,
it becoming less and less financially viable for oil
companies to produce AVGAS due to an ever decreasing market.
You don't have to go further than Italy before it can be
difficult to obtain; many larger airports don't stock it
anymore.
(2) Engines and spare parts for them: There surely must be
a limit as to how many times an engine can be overhauled
and the amount of "old new stock" cannot last forever.
Certification problems and lack of information regarding
materials and processes used seem to preclude manufacture
of many important parts at present.
(3) Tires and brake parts/linings: Very small market for
manufacturers of these parts; when does it become un-
economical? You can't produce new tyre in your basement
workshop!
What do others think?
Kenneth