Just out of curiosity - Airplane Guys

Yeah, been several death rays in the Bond films since I was a boy.
All genuine of course.

I know! James Bond almost lost his jewels to one!
069F8562-6DC1-4C44-914A-E82DC2E9072F.gif
 
"No Mr. Bond - I expect you to die!"
First job I had after leaving school was a lab rat in the steelworks. I'd been reading about lasers and how simple they were. I was intrigued by the polishing machines we had in the metallurgy lab and all I needed was a rod of ruby crystal, or a tube of CO2 gas, which would be much cheaper.
At that age, I couldn't see any good reason why we couldn't build one.
Fast forward 50 years and Co2 lasers are cutting steel...
 
Wonder if they could cover the top sides of the wings with photo cells to improve distance?
Would likely just be a drop in the bucket. The engine pulls 400kW. I suspect you'd be lucky to get 1kW of cells on those wings. I'd liken it to 1 gallon of reserve in a 400 gallon tank.
 
Production and storage are the biggest hurdles to solar power, at this time. Solar panels and batteries need to evolve into smaller, lighter, more powerful entities, maybe by 100 fold, before they're sufficiently mainstream to supplant fossil fuels as our primary energy source, because fusion engines and "warp drive" are still a long, long way off...
 
I know it's just an experimental plane but wonder what it cruising range would be. Wonder if they could cover the top sides of the wings with photo cells to improve distance?

Would likely just be a drop in the bucket. The engine pulls 400kW. I suspect you'd be lucky to get 1kW of cells on those wings. I'd liken it to 1 gallon of reserve in a 400 gallon tank.

Jim is dead-on with that 1 gallon in 400 analogy. I get asked all the time about putting solar panels on car roofs to charge the batteries and keep the car going and so here are some interesting factoids:
  • at the equator - the energy impinging on the earth from the sun is about 700W / sq. metre;
  • that amount decreases according the latitude at which one is located and it drops to zero at night;
  • solar panels - even the best ones - are not 100% efficient at turning solar energy into electricity;
  • in fact, the best solar panels available today are only about 10-15% efficient - so that 700W/sq. metre number is really more like about 70-100W/sq. metre;
  • a car takes about 30-40 HP or around 47 kW to cruise at 60 mph - and let's use an ideal efficiency of 100W/sq. metre for our solar panels;
  • soooo...you would need a solar panel with an area of AT LEAST (47,000 / 100 =) 470 sq. metres or 4826 sq.ft. to operate a typical car on a highway.
  • that cool looking electric airplane at 400kW would require about (400,000 / 100 =) 4000 sq. metres or 41,000 sq.ft. of solar panels to fly (that is the square footage of a good sized elementary school or a really big house).
...and all of that assumes solar panels are at the equator on a sunny day.

In engineering, we call that 700W/sq.metre a "God number" because, no matter how much better we make our components or how much we optimize things, we cannot affect /change / increase / improve that number. Someone else is in charge and we do not get a say in the matter.

Pete
 
Back
Top