Użytkownik "smjmitchell" napisał w
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Janusz,
Thanks for the information on build time hours. This is very useful
information. I think it illustrates that labour is where we need to work
at
reducing the cost. One many year is approximately 2000 hrs .. actually
more
like 1700-1800 when holidays etc are considered. So 1400 hrs is a lot.
That is more interesting, is that the old wooden gliders were even more time
consuming. When You look insede let's say the Bocian's wing, You'll see
thousands of "matches" inside which had to be glued prior to covering the
wings' surfaces. Glass is a much step forward in reducing the cost.
What I am now wondering is what the difference is between the Jantar
Standard and the SZD-55 ... I need to do some research to answer this for
myself because I am not that familiar with the later. 760 to 1400 hrs is a
big difference. However perhaps you have some comments on this.
I shink that Jantar has much less complicated design than the SZD-55.
Consider only the wingtip. Jantar's one is straight and there seems to be
much less work required. In case of the '55', it is tapering and, moreover
it doesn't do this in a Schempp-Hirth way (just like the Discus') where it
is divided into three or four legs, but it tapers continously. It is surely
the most perfect option when looking at it from the aerodynamics point of
view, but it also requires way more work than in Discus, not to mention the
Jantar. Also the interior of the Jantar wing seems to have a simplier
design.
Note also what I was writing of earlier, that the SZD was able to shorten
the production of the Junior to just two days when using the two shift per
day system. It has also some 20% less elements than Jantar. Maybe there's a
way out - simple designs which won't be too sophisticated, but still will
give a chance to fly for as wide spectrum of people at it is possible. [And
the PW-5 fits this definition quite well]. For me I don't want a racer, I
just want to fly for fun. A few hours of wandering around 10-20 miles away
from the airport, or some ridge would be enough for me, still being heaps of
fun. Flying for fun, not racing.
Are the
materials and tooling similar ?
Materials then were mostly locally produced, like the Epidian resins. Glass
cloth too I believe. (Jantar)
Are the tolerances tighter on the later
model ?
I don't think so. More probably it was simplier design.
Perhaps it is a question of the volume being produced ?
Possibly yes, however that wouldn't influence the number of workhours (with
exception of the prototypes where the hours are circa doubled). The savings
may come from sharing the fixed costs (like the production site rental or
the monthly social security fees) by a larger number of products (in whose
price these costs had to be included).
Regards,
--
Janusz Kesik
Poland
to reply put my name.surname[at]gazeta.pl
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