They are making a rocket pack. What would you expect? They have almost zero flight time. Pretty nasty fuel on your back, and blistering hot gasses pretty close to your arse. They just don't even sound fun. Wingsuit flying sounds like fun.
I have jumped off 30 meter falls before. Feet first of course, a number of times when i was a young lad, and one of us did get hurt (bruising). But that is higher than 90feet. 20 feet 90% lethal sounds like BS to me. In fact lets run the numbers. 20 feet is 6 meters, lets make it 10 cus round numbers and all. 2as=v^2 so you would be going at 14 m/s at impact. (at 6 it is only 10m/s) or 50km/h (36km/h). Lots of people water ski faster. I have hit a car from my motor cycle side on faster (ok that really hurt, but nothing broke, except the car and bike). People say water is like concrete, it really isn't. try hitting concrete at 50km/h.
Yes time matters and of course it affects total effective power density. If i want my drone to fly 2x longer. I need 2x the mass of batteries when consuming the *same power* (and now i am heaver so i need more power to stay aloft).
So if i want 1kW for 6 min, i can get away with a battery 10x lighter than if i need 1kW for an hour. Right now batteries are still just shit if you want to do anything that is not a toy for flying.
holy shit that is impressive. Ok yea there are probably technical details that matter for an air cooled flight motor, but in marine applications there is no way it was highly optimized for weight, so very doable. Power storage it is then (as the outstanding problem).
It is not like this is a new situation. For quite a while when there was "export" restrictions on encryption you couldn't really communicate to the US with decent security. Within the US was fine. Within the EU and the rest of the world was better. Even off shore US companies couldn't use strong encryption because it was still "exporting" it. I know at least several occasions were companies i worked for would not use US companies for this reason.
No i am not. Even LiPoly is huge and cooling is a massive problem. Even then you have almost no range at all. Power density is fine for a drone with a 10-20min flight time. That is not going to cut it even for the shortest short haul flight because by law you need a longer loiter time than that. Power density for a 1 hour flight time already looks rather poor.
technically they don't need to be pressurized. But insulated is a requirement. Heavy insulation. Also hydrogen really has a long list of other problems. Hope this is a link to a comment further up. Someone summed up better than me.
It really doesn't work that way. Also 20K is soo freeking cold you need lots of heavy insulation. It really doesn't work well in practice, and is very expensive to even try.
You cannot change the laws of physics. Hydrogen embritlement is a fact. The very low energy density of hydrogen is a fact. The very very cold temperatures of liquid hydrogen is a fact. The high energy cost and complexity of liquefying hydrogen is a fact (It has to do with the magnetic states of the molecule, its cool physics). The very high diffusion rates of hydrogen through a lot of common materials is a fact. The very high ignition range (flash point? i never remeber) in hydrogen is a fact (5%-90% IIRC).
There are no commercially successful hydrogen vehicles, so you don't even have a point.
As a rocket propellant it is very good for other reasons than energy density. Though it is quite high. It is the low molecular weight of the exhaust which means a much higher exhaust velocity and higher specific impulse. Note that many belive that hydrogen is not the best propellant to use from earth because this doesn't tell the whole story with vehicle performance.
Hydrogen is a very hard substance to store. In its most dense, weight/mass efficient form, liquid hydrogen is only 70kg per m3. Ten times less than A1 jet fuel. It is not just cold, at 20K it is about 4 times colder than liquid nitrogen and will instantly freeze air! So tanks are Huge and require a lot of heavy insulation. All other forms of hydrogen storage are just too heavy for aircraft.
Consider that for a long haul flight, a 747/A380 are about half fuel by weight. Finding 10x more fuel tank + insulation is a much bigger aircraft with a lot more drag.
Liquid methane is however much more practical. Liquid at about liquid nitrogen temp is really a lot easier to deal with and it about 300kg/m3 IIRC. It only halves the CO2 however compared to A1.
Both are better than batteries. But then A1 jet fuel is working now.
Perhaps we are, but first to file changes nothing about what can be patented. It only comes into effect when 2 parties file for the same patent at the same time. A very rare thing in fact.
Its also an obvious idea to a practitioner in the arts.
Unfortunately this is irrelevant as the patent attorneys and courts have got a hold of that language and twisted to mean something no one would find relevant or meaningful.
You have no idea what first to file means compared to "first to invent" do you. First to file changes *nothing* about the requirements for a patent. So if you didn't need a working prototype for first to invent (you didn't) then you don't now. It changes nothing about prior art. It changes nothing about anything unless 2 people filed for the same thing at the same time! Proving you "invented" first is basically impossible and meant that it was very expensive to resolve. While first to file has a nice time stamp on it. The rest of the worlds has been using first to file forever and it works better than the US system. Only the US has the batshit crazy rules (and still do) like first to invent (What the fuck does that even mean?). Or you can patent something up to a year after you have disclosed it.
People really believe *everything* is coded in your DNA. Right down to the type of music you like. Explain that identical twins (same DNA) not only have very different personalities, look different, like different things etc. And people still don't get that nurture/nature part at all.
Slashdot Mirror
IT will still "see" a 100 times better than a meat sack with only 2 often fairly degraded optical sensors.
They are making a rocket pack. What would you expect? They have almost zero flight time. Pretty nasty fuel on your back, and blistering hot gasses pretty close to your arse. They just don't even sound fun. Wingsuit flying sounds like fun.
I have jumped off 30 meter falls before. Feet first of course, a number of times when i was a young lad, and one of us did get hurt (bruising). But that is higher than 90feet. 20 feet 90% lethal sounds like BS to me. In fact lets run the numbers. 20 feet is 6 meters, lets make it 10 cus round numbers and all. 2as=v^2 so you would be going at 14 m/s at impact. (at 6 it is only 10m/s) or 50km/h (36km/h). Lots of people water ski faster. I have hit a car from my motor cycle side on faster (ok that really hurt, but nothing broke, except the car and bike). People say water is like concrete, it really isn't. try hitting concrete at 50km/h.
Copyright is not a patent. Prior art is irrelevant. ditto for trademarks.
Man i thought you where one of the good ones. Guess not.
Yes time matters and of course it affects total effective power density. If i want my drone to fly 2x longer. I need 2x the mass of batteries when consuming the *same power* (and now i am heaver so i need more power to stay aloft).
So if i want 1kW for 6 min, i can get away with a battery 10x lighter than if i need 1kW for an hour. Right now batteries are still just shit if you want to do anything that is not a toy for flying.
holy shit that is impressive. Ok yea there are probably technical details that matter for an air cooled flight motor, but in marine applications there is no way it was highly optimized for weight, so very doable. Power storage it is then (as the outstanding problem).
https://www.youtube.com/watch?...
It is not like this is a new situation. For quite a while when there was "export" restrictions on encryption you couldn't really communicate to the US with decent security. Within the US was fine. Within the EU and the rest of the world was better. Even off shore US companies couldn't use strong encryption because it was still "exporting" it. I know at least several occasions were companies i worked for would not use US companies for this reason.
What a moron. 700bars and you think that is a flight weight tank. You don't understand the very basics of anything.
No i am not. Even LiPoly is huge and cooling is a massive problem. Even then you have almost no range at all. Power density is fine for a drone with a 10-20min flight time. That is not going to cut it even for the shortest short haul flight because by law you need a longer loiter time than that. Power density for a 1 hour flight time already looks rather poor.
Not in flight weight configurations. Trains, boats and buildings don't care much about mass. Aircraft do.
technically they don't need to be pressurized. But insulated is a requirement. Heavy insulation. Also hydrogen really has a long list of other problems. Hope this is a link to a comment further up. Someone summed up better than me.
It really doesn't work that way. Also 20K is soo freeking cold you need lots of heavy insulation. It really doesn't work well in practice, and is very expensive to even try.
200HP or less than 200kW is a toy compared to modern airliners. You need to be well into the MW range to be relevant.
But the sheer power required is huge. 747 engines are in the MW range and that is going to a battery bigger than an airplane!
You cannot change the laws of physics. Hydrogen embritlement is a fact. The very low energy density of hydrogen is a fact. The very very cold temperatures of liquid hydrogen is a fact. The high energy cost and complexity of liquefying hydrogen is a fact (It has to do with the magnetic states of the molecule, its cool physics). The very high diffusion rates of hydrogen through a lot of common materials is a fact. The very high ignition range (flash point? i never remeber) in hydrogen is a fact (5%-90% IIRC).
There are no commercially successful hydrogen vehicles, so you don't even have a point.
Very well summed up.
As a rocket propellant it is very good for other reasons than energy density. Though it is quite high. It is the low molecular weight of the exhaust which means a much higher exhaust velocity and higher specific impulse. Note that many belive that hydrogen is not the best propellant to use from earth because this doesn't tell the whole story with vehicle performance.
Hydrogen is a very hard substance to store. In its most dense, weight/mass efficient form, liquid hydrogen is only 70kg per m3. Ten times less than A1 jet fuel. It is not just cold, at 20K it is about 4 times colder than liquid nitrogen and will instantly freeze air! So tanks are Huge and require a lot of heavy insulation. All other forms of hydrogen storage are just too heavy for aircraft.
Consider that for a long haul flight, a 747/A380 are about half fuel by weight. Finding 10x more fuel tank + insulation is a much bigger aircraft with a lot more drag.
Liquid methane is however much more practical. Liquid at about liquid nitrogen temp is really a lot easier to deal with and it about 300kg/m3 IIRC. It only halves the CO2 however compared to A1.
Both are better than batteries. But then A1 jet fuel is working now.
Its also an obvious idea to a practitioner in the arts.
Unfortunately this is irrelevant as the patent attorneys and courts have got a hold of that language and twisted to mean something no one would find relevant or meaningful.
You have no idea what first to file means compared to "first to invent" do you. First to file changes *nothing* about the requirements for a patent. So if you didn't need a working prototype for first to invent (you didn't) then you don't now. It changes nothing about prior art. It changes nothing about anything unless 2 people filed for the same thing at the same time! Proving you "invented" first is basically impossible and meant that it was very expensive to resolve. While first to file has a nice time stamp on it. The rest of the worlds has been using first to file forever and it works better than the US system. Only the US has the batshit crazy rules (and still do) like first to invent (What the fuck does that even mean?). Or you can patent something up to a year after you have disclosed it.
In other news the economy still hasn't recovered from all the unemployed buggy whip manufactures and horse trainers.
People really believe *everything* is coded in your DNA. Right down to the type of music you like. Explain that identical twins (same DNA) not only have very different personalities, look different, like different things etc. And people still don't get that nurture/nature part at all.
Your AC. Who gives a fuck. Your not even prepared to put a fake name to stance/faith/whatever.