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Old 06-22-2019, 05:34 PM   #6041 (permalink)
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I'll let someone else columnize and tabulate your numbers, but Fuller looked at overall efficiency (not thermal efficiency), found it to be ~4% and suggested doubling that to 10%:
Quote:
Originally Posted by DDG
Tensegrity - The Geometry of Thinking - R. Buckminster Fuller
https://www.bfi.org/about-fuller/big...metry-thinking
With the majority of humanity understanding its science and technology, an overall efficiency of 10% may be obtained. At a now technically accomplishable overall efficiency of 10%, all humanity can be living and enjoying whole Earth at a continuously sustainable level, higher than any human beings heretofore ever experienced or dreamt.
That was in the 1960s so we may be at 10% or so now. He wasn't looking at just thermal efficiency, but also things like cars idling at stop lights. Which might otherwise fall through the cracks.

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Old 06-24-2019, 12:44 PM   #6042 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
High temperatures for the past few weeks has been high 60s, low 70s here. Lows have dipped into high 40s. This is unusually cool. We should be in low-mid 80s this time of year. Should be in the 90s by 4th of July.
Yes - the jet stream is a wobbly mess, because of the reduced Arctic ice. Wobbly jet stream is a result of increased warming, that melts the Arctic ice, and it lets Arctic air slip much farther south. The flip side is the Arctic is about 40F warmer than it used to be.
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Old 06-24-2019, 12:47 PM   #6043 (permalink)
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Quote:
Originally Posted by redpoint5 View Post


Wiki


General characteristics
Crew: 2
Capacity: 9 passengers, maximum payload of 1,250kg (2,750lb)[1]
Length: 12.2 m (40 ft 0 in)
Wingspan: 16.12 m (52 ft 11 in)
Max takeoff weight: 6,350 kg (13,999 lb)
Fuel capacity: 900 kWh, Li-ion
Powerplant: 3 electric motors , 260 kW (350 hp) each
Performance
Cruise speed: 482 km/h (300 mph; 260 kn) at 3,000 m (10,000 ft)
Never exceed speed: 630 km/h (391 mph; 340 kn)
Range: 1,046 km (650 mi; 565 nmi) including IFR reserve
Service ceiling: 9,100 m (29,900 ft)
Approach speed: 185 km/h; 115 mph (100 kn)
Apparently, the first customer for this airplane is Cape Air, flying between Massachusetts mainland and the Cape and islands.
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Old 06-24-2019, 01:01 PM   #6044 (permalink)
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I wonder if battery powered planes can make economic sense now?

Lower maintenance and fuel costs; increased time spent in service.

You don't want "refueling" to be the limiting factor in turn-around though.
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Old 06-24-2019, 01:33 PM   #6045 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
I wonder if battery powered planes can make economic sense now?

Lower maintenance and fuel costs; increased time spent in service.

You don't want "refueling" to be the limiting factor in turn-around though.
I wonder if the aircraft manufactures could come up with a quick-change battery system. Kind of a trolley that rolls in and out, and connects fairly simply.

Like a drill battery on steroids.
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Old 06-24-2019, 01:47 PM   #6046 (permalink)
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That would be perfect. It provides redundancy too so if there's an issue with the currently installed battery, you can swap it out relatively quickly.

One question I've always had is why prop planes don't have shrouds? As I understand it, shrouds increase efficiency.
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Old 06-24-2019, 01:49 PM   #6047 (permalink)
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https://en.wikipedia.org/wiki/Solar_minimum
Quote:
Solar minima are not generally correlated with changes in climate but recent studies have shown a correlation with regional weather patterns.[citation needed]
Quote:
Grand solar minima have shown some correlation with global and regional climate changes.[citation needed]
It's contentious, hence the 'citations needed' but Solar Minima result in increased Cosmic radiation and cloud cover.

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Old 06-24-2019, 01:51 PM   #6048 (permalink)
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But the sun doesn't effect climate. Lol
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Old 06-24-2019, 02:32 PM   #6049 (permalink)
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"While some may have the impression that renewables account for a large share of global energy consumption, their total contribution in fact remains small. Even if we include modern biofuels and hydropower, it is still less than five percent."
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Old 06-24-2019, 02:45 PM   #6050 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
...the Arctic is about 40F warmer than it used to be.
Define, "used to be".

The sources I'm finding say the Arctic has warmed 3.6 F over the past 50 years. Is the other 36.4 degrees considered from the coldest period of the ice age?

It's hyperbole that gives deniers ammunition against a threat which may have credibility.

People are entitled to their own opinions, but they aren't entitled to their own facts.

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