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Author Topic: Could you give up flying? Meet the no-plane pioneers  (Read 11704 times)
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« Reply #75 on: October 20, 2019, 12:11:34 am »

There are some other possibilities, and one getting a lot of work is sunbeams+CO2=fuel. Mostly it involves making hydrogen first, with a further step (or steps) of reducing the carbon in CO2 to suitable hydrocarbons. Currently inefficient, and messy, thus expensive - but let a load of chemists loose on a problem to play hunt-the-catalyst and those usually improve quite fast. (Scientific paper example here.)
Simplifying so I can check if I've understood correctly, the proposal is to take CO2 from the air and turn it into fuel which is then burnt, releasing that CO2 back into the air? Sounds similar to biofuels in that it avoids releasing carbon that is currently 'locked in' as fossil fuels, but using a man-made process instead of photosynthesis. Better than burning fossil fuels of course but energy is still required to make the fuel (biofuel normally also involves energy to dry out the plant matter before it is used as fuel). As far as aviation is concerned though there is altitude to consider, for some reason water vapour from hydrogen-powered ground vehicles is not an issue but released from a plane at altitude it would be a significant greenhouse gas.

Yes, and if photosynthesising algae are involved, as has been suggested, it could reasonably be argued that the fuel IS a form of biofuel. The main merit of such processes is that they can be carried on in regions unsuited to agriculture, and therefore not reducing food production.
Plenty of sunlight is needed, and a lot of water in which the algae are suspended. Fresh water can be obtained anywhere near the sea, by desalination.
A great area of land is required, but  there is plenty of land unfit for anything else.
« Last Edit: October 20, 2019, 12:24:26 am by broadgage » Logged

A proper intercity train has a minimum of 8 coaches, gangwayed throughout, with first at one end, and a full sized buffet car between first and standard.
It has space for cycles, surfboards,luggage etc.
A 5 car DMU is not a proper inter-city train. The 5+5 and 9 car DMUs are almost as bad.
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« Reply #76 on: October 20, 2019, 04:59:55 pm »

Remember the 12th commandment "keep up thy airspeed, lest the ground riseth up and smites thee".

Or as I was taught: "On your final approach to land, the three most important things to watch are airspeed, airspeed, and airspeed."

Now, please!
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