newtoon

newtoon t1_je8f0x6 wrote

Reply to comment by hucareshokiesrul in TIL Early drones were developed during the First World War. These radio controlled planes were primarily for target practice but by 1942 a drone with a built in TV camera was capable of delivering a torpedo to a ship 20 miles from the controller. by jamescookenotthatone

Answer is the stabilisation electronic board allowing a quarotor to be stable. IT became cheap in the end of the 2000s

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newtoon t1_j5h1nv7 wrote

Reply to Seattle-based Jetoptera is developing a vertical takeoff aircraft that can travel at almost 1,000 km/h with a radically simplified new type of engine. With almost no moving parts, it uses super-compressed air to create vortexes for thrust. by lughnasadh

If you look for the conference of one of the conceptors, you may understand why it is interesting. An helicopter is presently he Best solution efficiency wise because there is one large rotor. Yet, it is noisy, cumbersome and dangerous (big blades turning fast). So, if we fan get rid of open blades, it s quite interesting for some uses. An helicopter is great in hovering but not adapted for long distance and going fast. So, you want wings. And wings like fast moving air on the upper wing for best lift. If you have standard props, it does not fit well since it is a circular design and the wing is flat. You could make the wing half circles and it works but has drawbacks https://en.m.wikipedia.org/wiki/Channel_wing . Hence, some air taxi makers use lots of small turbines on the upper surface. But If you have a compressor, the design of the exhaust can be anything you like and you can blow the best way on the upper surface ! You can also combine with a "box wing design" . Brillant. The only question of those kind of design is what happens when the compressor fails mind flight. What is the glide possibility ?

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newtoon t1_iwkiv6v wrote

Reply to comment by itriedidied in Aerobic exercise can reduce the risk of metastatic cancer by 72%. According to the researchers, intensity aerobic exercise increases the glucose (sugar) consumption of internal organs, thereby reducing the availability of energy to the tumor. by Wagamaga

Well, I understand, but knees are nevertheless neither made for sitting all day nor running (especially on hard roads), but for walking (a lot). If knees hurt after running one day later with age, it's cartilage that went away. Then, stop immediately this activity and walk (or swim too) instead. My parents are therapists and were very happy that running became a standard sport : it put food on the table...

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newtoon t1_iwgsdmq wrote

Reply to comment by Sir10e in Aerobic exercise can reduce the risk of metastatic cancer by 72%. According to the researchers, intensity aerobic exercise increases the glucose (sugar) consumption of internal organs, thereby reducing the availability of energy to the tumor. by Wagamaga

It is the same principle at play with fasting, I guess. It is known that normal cells can go into temporary "sleep mode" while cancer cells can't wait for having their glucose fix or the immune system find them and kill them.

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