By not using them?
That's kinda like saying that lifeflight helicopters aren't super useful. For some specialized cases, this could come in handy:25 minute operating time, 43 mph top speed. Yeah, that's gonna come in super useful.
I was thinking one engine and a lot of pulleys, but I like your idea better.I was thinking one engine with a generator, but your concerns are still valid even in that situation.
Multi rotor helicopters work precisely because you can vary individual propeller speed quickly. Experimenters using several gas engines have found it nearly impossible to maintain level flight the way you expect a drone to, and it's the reason nearly all large helicopters only have one large propeller. The ones with two (such as the sky cranes and military heavy lift choppers) require additional training.I was thinking one engine and a lot of pulleys, but I like your idea better.
--Patrick
Yep. Add in some supercapacitors and a (MUCH smaller) Li-ion pack or something to even out demand and you're good to go. Frankly I'm surprised the entire automotive industry hasn't switched to this model by now. Traction control/ABS could be SO much smarter, and I'm sure that even with conversion losses, it's probably better from a modular maintenance standpoint to have a tiny, efficient engine (or two! Or more!!!) humming at a constant 5k RPM supplying that power rather than a single large displacement, cumbersome mechanical monster like we have now.electronic speed control of three phase motors is the way to go.
Terribly inefficient, but would still be more powerful and long lasting than a battery only solution.
Hybrid Hover Bike!
I assume that eventually any "drone" that carries personnel will be required to have a minimum of 5 rotors JUST so that single rotor failure will theoretically not cause catastrophic failure, and the vehicle can at least "glide" to ground on the remaining 4.Oh, but crashing would be spectacular. Better wear a 'chute, 'cause there's no useful autorotation on a multiprop helicopter.
Just keep in mind how HIGH you'd need to be to have the time to open a parachute: http://keisan.casio.com/exec/system/1231475371Oh, but crashing would be spectacular. Better wear a 'chute, 'cause there's no useful autorotationon a multiprop helicopter.
It depends. You're thinking criminals in cars or on bikes - in a lot of cities, certainly in the Middle East (though, typically, not in Dubai), you're faced with a lot of small, winding streets with stairs. We still have police doing their beats in the street on horseback because a horse can deal with stairs better than a mountain bike. I could see these things going over market stands, skipping stairways, even going up-and-over buildings to cut across switchbacks.. You're not going to patrol on this, let alone chase criminals.
25 minutes That's how long you can run this thing. That's why you won't be patrolling on it.It depends. You're thinking criminals in cars or on bikes - in a lot of cities, certainly in the Middle East (though, typically, not in Dubai), you're faced with a lot of small, winding streets with stairs. We still have police doing their beats in the street on horseback because a horse can deal with stairs better than a mountain bike. I could see these things going over market stands, skipping stairways, even going up-and-over buildings to cut across switchbacks.
I mean, I don't see these as more useful than a cop on a street bike with drone assistance, in most cases, but I wouldn't say it's necessarily useless.