> Because of basic characteristics, hydrogen is not
> a good aviation fuel substitute. It is possible that
> a suitable aviation fuel will be extracted from coal
> to partially substitute. However, in my opinion, the
> airline industry has already passed its peak so
> the transition to better ground transportation,
> propsed in the post below, is very likely to be given
> a powerful boost by the fuel problem.
> Denis Frith
> I spent over thirty years in research into aircraft
> gas turbine engines
Not much I can add at this point, other than to pass this along to P&C
for possible discussion.
Thank you for the post... Denis, and Harel.
--------- Forwarded message ----------
From: "=?iso-8859-1?q?Frith,=20Denis?=" <denisaf2000@...
Date: Mon, 5 Jul 2004 14:35:23 +1000 (EST)
Subject: Re: [powertothepeople] Dangers of aviation
There have been a number of other studies, including in the US, that
have pointed out the harm done by emissions from airliners. The post
below suggests some sound measures to reduce the impact of airline
travel on climate change. Surprisingly then, no mention is made of
the fact that the supply of oil is starting to fall short of demand
and this is certain (I use that term only after careful
consideration) to have a tremendous impact on the cost and
availability of the very specialized aviation fuel. The gas turbine
engines in airliners are very highly developed machines critically
dependent on the characteristics of the fuel they use. The engines in
the current fleet have been under development for over forty years at
the cost of a tremendous array of irreplaceable resources as well as
muc human ingenutiy and thechnological advances. Because of basic
characteristics, hydrogen is not a good aviation fuel substitute. It
is possible that a suitable aviation fuel will be extracted from coal
to partially substitute. However, in my opinion, the airline industry
has already passed its peak so the transition to better ground
transportation, propsed in the post below, is very likely to be given
a powerful boost by the fuel problem.
I spent over thirty years in research into aircraft gas turbine
--- harelbarzilai wrote: > Pat you will like this...maybe this (if
you haven't seen it already) will be another piece of evidence you can
> wield. You were the first on this group as I recall to
> repeatedly post citations on this issue...
> From BBC online today:
> Aviation growth 'risk to planet'
> The rise in demand for air travel is one of the most serious
> environmental threats facing the world, a study says.
> The University of York report says government plans for airport
> expansion are in direct conflict with targets to reduce greenhouse
> Report authors Professor John Whitelegg and Howard Cambridge say
> polluting gases from aircraft exhaust fumes are on the increase.
> Airlines should pay an environmental charge equal to the damage,
> they say.
> The UK and other EU governments have made a massive commitment to
> expanding aviation, the report says.
> It sets out a model for dealing with aviation over the next 30
> years, recommending steps to be taken by the UK and other EU countries
> including an end to the tax-free status of aviation fuel.
> * * *
> "We could have a really high quality railway system that gives
> people a real alternative" -Professor John Whitelegg
> * * *
> The report says at least 50% of visitors should access airports by
> public transport, and wants journeys of less than 400 miles to be
> undertaken by train rather than plane, eliminating 45% of flights.
> Prof Whitelegg told the BBC that high-speed rail services such as
> Eurostar needed to be improved so that every city in the UK was
> He said: "We could have a really high quality railway system that
> gives people a real alternative.
> "At the moment we have cheap flights and some of the most expensive
> railways in the world. That is the wrong way around."
> The report says businesses should be encouraged to use technology
> such as video conferencing as an alternative to travel.
> Governments should carry out the Zurich airport "bubble concept",
> limiting emissions of all kinds from airports and treating them
> like large industrial sites, the report says.
> Prof Whitelegg said air travel growth had been "fuelled by generous
> tax breaks and state aid, and is contrary to the objectives of
> environmental policy, especially efforts to prevent the worst
> consequences of climate change".
> He told the BBC an environmental tax on flying was needed to
> reflect the "environmental realities".
> He said governments were moving towards implementing such a tax,
> which could be as much as �40 or �50 per flight.
> "This will ultimately be paid by the person who is flying or the
> person who is bringing in lettuces from Africa," he said.
> The University of York's Stockholm Institute publishes the report
> on Monday.
> Story from BBC NEWS:
> Published: 2004/07/04 07:17:58 GMT
> Related links:
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