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  #1941  
Old 03.04.2020, 12:52
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Re: Ask a Scientist

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The pilots angle their planes slightly nose-up while inverted so that the air running over the wings still generate the lift in the right direction. Also, stunt planes have curved upper and lower surfaces of their wings which means they're less fuel-efficient but able to fly equally well either way up. Regular wings are flatter on the bottom than the top, generating more lift when up the right way.

The biggest problem with most planes is that they're designed to use gravity to help with several systems in the engine - they need to be specially designed to operate inverted for more than about half a minute, or even less with some.
One example is the fuel tank - normally, the fuel is taken from the bottom of the tank ... aerobatic planes have a special system that uses gravity to tell where the 'bottom' of the tank is at any time, and take fuel from there.
I know this is a little late.

I can confirm some of the aerfoil bits, stunt planes generally have a symetrical foil, means as good upside down as right way up. Also means just as bad when up as down (contant inputs required to maintain steady flying).
The symettry helps when they turned sideways as well, this means there nearly no stick input to keep them straight, only rudder to maintain altitude. A normal aerofoil will try to "climb" sideways when banked, beneficial in most cases as you bank to turn, when doing aerobatic shenanigans it's not as useful though.

With the fuel tank it's become less of an issue due to fuel injected engines and not relying on gravity floats in carbs or the likes. The draw from the tank is on a flexible weighted arm which basically flops around with the fuel.
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  #1942  
Old 06.04.2020, 01:01
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Re: Ask a Scientist

Hi all. Quick question regarding Covid-19 please, and I've already asked this of someone who is a molecular biologist, so I'm curious to see how someone from another scientific discipline would answer.

Is it advisable and safe to use a Karcher steam cleaner on floors, kitchens and bathrooms at this time?
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  #1943  
Old 06.04.2020, 07:53
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Re: Ask a Scientist

I seriously doubt there's any evidence to prove or disprove the efficiency and efficacy of floor steamers on COVID-19 (or just about any other virus). But you CAN clean or lightly scrub the floors with a soap and water solution first, leave it in for 2 minutes, and then steam if off. The soap will kill any potential virus on the surfaces, before you turn it into aerosol with your cleaning tool.
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  #1944  
Old 06.04.2020, 07:54
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Re: Ask a Scientist

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Hi all. Quick question regarding Covid-19 please, and I've already asked this of someone who is a molecular biologist, so I'm curious to see how someone from another scientific discipline would answer.

Is it advisable and safe to use a Karcher steam cleaner on floors, kitchens and bathrooms at this time?
No. A mop and water is enough
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  #1945  
Old 06.04.2020, 07:56
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Re: Ask a Scientist

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Now is the time to hook the next generation EF'ers: Get your descendants on a "please do my home-work" thread.
She's already a member.
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  #1946  
Old 06.04.2020, 10:14
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Re: Ask a Scientist

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... The soap will kill any potential virus on the surfaces, before you turn it into aerosol with your cleaning tool.
Thank you! That's the same answer I was previously given. I hadn't reckoned on the aerosol part of the scenario, so my steam cleaner is staying in the keller for the duration.
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  #1947  
Old 06.04.2020, 14:24
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Re: Ask a Scientist

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Hi all. Quick question regarding Covid-19 please, and I've already asked this of someone who is a molecular biologist, so I'm curious to see how someone from another scientific discipline would answer.

Is it advisable and safe to use a Karcher steam cleaner on floors, kitchens and bathrooms at this time?
In your own home, not a problem IMHO! sorry from a biochemist but I am not sure who is really qualified to give a professional opinion -it just seems basic common sense). If your surfaces are that contaminated by coronavirus particles, the you must surely have it by now
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  #1948  
Old 06.04.2020, 14:37
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Re: Ask a Scientist

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If your surfaces are that contaminated by coronavirus particles, the you must surely have it by now
Hopefully not. I'm keeping outdoor shoes, clothes and bags in the keller and getting changed there. Trying to semi-shield my OH. Just read the advice that heat alone might not be killing the virus. I knew cold and freezing just suspended it, but wasn't sure about heat.
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  #1949  
Old 06.04.2020, 15:14
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Re: Ask a Scientist

How often do you have to go out?
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  #1950  
Old 06.04.2020, 15:18
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Re: Ask a Scientist

Trying to keep it to once every 14 days to be as sure as I possibly can be that I don't have the virus myself and could pass it on. It's just the same procedure my family had to follow for a week when my mum had C. difficile, so I kind of know how to minimise the risk as best as I can.
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  #1951  
Old 06.04.2020, 15:28
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Re: Ask a Scientist

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Trying to keep it to once every 14 days to be as sure as I possibly can be that I don't have the virus myself and could pass it on. It's just the same procedure my family had to follow for a week when my mum had C. difficile, so I kind of know how to minimise the risk as best as I can.
I doubt that the virus will survive on your clothes and shoes those 14 days, tbh, but I am not a virologist. Can you call the city council and put yourself on the list of people who get deliveries (food, meds)? They are supposed to provide the service although the official information hasn't reached us.
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  #1952  
Old 06.04.2020, 16:10
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Re: Ask a Scientist

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I doubt that the virus will survive on your clothes and shoes those 14 days, tbh,
It won't. Anyway, whatever I've worn goes straight in the washing machine in the keller. The point is limiting possible ways to come into contact with the infection, and to limit your chances of passing the infection on if you are pre-symptomatic or asymptomatic. Shopping is the primary one for me.

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Can you call the city council and put yourself on the list of people who get deliveries (food, meds)? They are supposed to provide the service although the official information hasn't reached us.
I'm perfectly healthy with a very strong immune system according to my current doctor and my previous ENT specialist, so more than capable of doing the shopping. Just taking the same precautions I've taken in the past when dealing with a highly infectious disease. Many people who've had a family member in ICU or hospital isolation will be familiar with the drill.
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  #1953  
Old 11.04.2020, 16:58
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Re: Ask a Scientist

Why are CO2 levels still climbing even though traffic and industry are at all time low?
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  #1954  
Old 11.04.2020, 17:25
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Re: Ask a Scientist

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Why are CO2 levels still climbing even though traffic and industry are at all time low?
Are you for real? You want a scientist to answer a really dumb question? Look at the data set. Look at the location.
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  #1955  
Old 11.04.2020, 18:10
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Re: Ask a Scientist

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Are you for real? You want a scientist to answer a really dumb question? Look at the data set. Look at the location.
Perhaps you would be kind enough to explain why is this a dumb question ?

Pollution is down everywhere since Covid started, yet in Hawaii's Mauna Loa obersvatory CO2 is higher than it's ever been.
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  #1956  
Old 11.04.2020, 18:16
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Re: Ask a Scientist

On the site to which you linked, Pashosh, I found these numbers as "Recent Global CO2 Trend": https://www.esrl.noaa.gov/gmd/ccgg/trends/gl_trend.html

Unfortunately, in the green block there, it shows only the values from 6th April to 10th April 2020. I could't see how to look at the dates pre-6th April. Can you see how to show those?

I think it would be interesting to see, for example, the value they define as the "Global CO2 Trend" over the past year or 18 months, and particularly the past three months, in some detail.
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  #1957  
Old 11.04.2020, 18:16
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Re: Ask a Scientist

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Perhaps you would be kind enough to explain why is this a dumb question ?

Pollution is down everywhere since Covid started, yet in Hawaii's Mauna Loa obersvatory CO2 is higher than it's ever been.
The next door volcano?
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  #1958  
Old 11.04.2020, 18:57
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Re: Ask a Scientist

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Perhaps you would be kind enough to explain why is this a dumb question ?

Pollution is down everywhere since Covid started, yet in Hawaii's Mauna Loa obersvatory CO2 is higher than it's ever been.
I had not thought of the volcano, but if you expect the reduced man-made CO2 emissions since Covid to show up in the data for Hawaii you will have to wait a while, if the lockdowns remain for an extended period. Maybe an atmospheric scientist can give a realistic estimate of how long that would take.
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  #1959  
Old 11.04.2020, 19:01
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Re: Ask a Scientist

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I had not thought of the volcano, but if you expect the reduced man-made CO2 emissions since Covid to show up in the data for Hawaii you will have to wait a while, if the lockdowns remain for an extended period. Maybe an atmospheric scientist can give a realistic estimate of how long that would take.
Unless of course, the CO2 emissions are not man-made

I will go and wash my mouth with soap now
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  #1960  
Old 11.04.2020, 19:27
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Re: Ask a Scientist

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On the site to which you linked, Pashosh, I found these numbers as "Recent Global CO2 Trend": https://www.esrl.noaa.gov/gmd/ccgg/trends/gl_trend.html

Unfortunately, in the green block there, it shows only the values from 6th April to 10th April 2020. I could't see how to look at the dates pre-6th April. Can you see how to show those?

I think it would be interesting to see, for example, the value they define as the "Global CO2 Trend" over the past year or 18 months, and particularly the past three months, in some detail.
The sites shows data from 2016 onwards - the rising trend is clear.
As far as I could see there was no eruptions who could explain.

Apparently the climatologists of this forum are still on holiday.
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