On 26/05/2021 20:35, newshound wrote:
On 26/05/2021 20:12, The Natural Philosopher wrote:
On 26/05/2021 18:01, newshound wrote:
Actually I would not be surprised if washing machines had not done
that, and aero engine efficiency improvement is probably in double
digits over a decade.

Bless!

Quite the ArtStudent aren't you?

Gas turbine efficiency as such us where it was from the get-go - about
37%. Once you have made the transition to high bypass turbofans,
that's pretty much it.


Missing the point. We were not discussing GT thermal efficiency,

you never made that clear

we're
talking about fuel per passenger mile. Which goes down with each new
Trent (composites and aerodynamics helps too).

Aerodynamics and materials outside the engine dominate. The engines
themselves are scarcely any more efficient at all. Lighter possibly.
delivering power in a slightly more useful way perhaps

Your point was that engine efficiency had advanced in double digits. I
am saying that engine *efficiency* has hardly changed,. The engines are
a bit lighter, and fine tuning of bypass ratios improves efficiency a
bit, but all the advances in aircraft design have come from slightly
better aero and better materials, and electronics, not massively better
engines.


Moore's law fits the introduction of new technology: asymptotic advance
towards 'as good as it gets' is the norm for mature technology.
Aircraft, jet engines, steam engines, car engines...electric motors and
batteries - all these are 'mature technology'

I have a server based on a mid noughties entry level motherboard and a
desktop that is based on 2015 entry level tech . A decade between them.
Back in the 90s that would have meant 100 times better performance. In
this case its barely 4.

Computers are now mature. Moore's law has ceased to apply.

Electric cars and batteries are mature technology. Moore's law does not
apply.



--
"I am inclined to tell the truth and dislike people who lie consistently.
This makes me unfit for the company of people of a Left persuasion, and
all women"