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SureFly – a personal helicopter designed for safe and easy flight

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Re: SureFly – a personal helicopter designed for safe and easy flight

#91
post #70
post #69

Earlier quoted context omitted.

I wouldn't worry about that. Most people can't even drive cars in "2D" safely, never mind helicopters. The general public will never be given the skies, unless the flights are automated.

It's much harder to hit something in the air.

It's much easier to be cocky and negligent if the last 100 times you drove you never encountered something to hit.

Re: SureFly – a personal helicopter designed for safe and easy flight

#92
post #66
post #63

Earlier quoted context omitted.

We'd be better off with dense cities where automobile is not the primary means of transportation. Like e.g. NYC or many European cities. Cars and large trucks should mostly belong to highways and country roads.

NYC is a very far way from being a carless paradise. Yes, lots of people walk or take transit. But, especially in Manhattan, many streets are choked for a good chunk of the day.

Far more people use the subway than drive to work.

Only 28% of people in NYC commute by car/truck/van. 55% take public transit and 10% walk, 1% bike, 4% work from home, and 2% take a Taxi or other. https://www.nycedc.com/blog-entry/new-york-commute

PS: The van thing is also closer to a bus than a private car.

Re: SureFly – a personal helicopter designed for safe and easy flight

#93

I'm very skeptical of their claims of "unparalleled safety". Thanks to "autorotation"[1] regular helicopters can safely land in most situations even with complete power failure. The claims of safety of this craft seems to derive from N+1 battery redundancy which isn't that impressive. They say they have 8 independent motors, but don't say how many are needed to stay aloft. [1] https://en.wikipedia.org/wiki/Autorotati…

Should be four or less considering each arm has two props. (Unless the motors aren’t powerful enough)

A lift/weight ratio of 2:1 would be quite remarkable, and the ceiling of a mere 4000' suggests that it does not have that sort of reserve, even at sea level and when being powered by the gasoline motor. Being anywhere somewhat hot or high would quickly erode that margin.

On the other hand, the chances of four motors failing in the time it takes to set down is probably not high. Back to the first hand, if you do have multiple failures, it is not likely to be an optimal grouping.

Re: SureFly – a personal helicopter designed for safe and easy flight

#94
It is cute to show it in a parking lot, but with those unprotected blades it is unlikely you will be able to operate it anywhere but on an airfield, helipad or private land, for safety reasons. And with four sets of contra-rotating blades (small, therefore turning fast) and a gasoline engine, it will be noisy as hell.

Re: SureFly – a personal helicopter designed for safe and easy flight

#95
post #69

Earlier quoted context omitted.

I wouldn't worry about that. Most people can't even drive cars in "2D" safely, never mind helicopters. The general public will never be given the skies, unless the flights are automated.

Don't today's drones and airplanes demonstrate that automating flying is a lot easier than automating driving?

That might stop being true if the air is as crowded as the roads.

Re: SureFly – a personal helicopter designed for safe and easy flight

#96
post #48

Earlier quoted context omitted.

I think everyone must have felt this way about automobiles. And by and large, it's worked out just as horribly as they imagined: our communities are divided by dangerous moats we call "roads" -- death traps which we must painstakingly teach our children to avoid, if we dare let our children wander outside on their own anywhere near them in the first place.

I don't get the point - are you suggesting we'd be better off without automobiles? Would we go back to horses? What about global logistics? Agriculture?

It's not a binary choice between "current system" and "no cars whatsoever".

Re: SureFly – a personal helicopter designed for safe and easy flight

#97
post #19

A part of me thinks this is really cool tech and it would be amazing for anyone to be able to just hop aboard their personal helicopter and fly wherever they want, but then another part of me thinks of the future this would create, skies no longer clear, filled with objects buzzing around and what hell that would be, on top of the already stressful and crazy life we have now. It's the kind of situation where I think…

This would have to fall into the ultralight classification for someone to fly this without training. The FAA could easily classify this otherwise if they perceived any problem.

Also, getting your pilots license is nothing like getting a car license, the training is much harder and requires a certain amount of hours in the car with a licensed flight instructor before they can fly on their own (I believe it's 50 hours in the cockpit). It's also prohibitively expensive as you have to pay for fuel and time. You won't see a bunch of unmotivated teens flying these things any time soon. Having worked at the FAA on the regulation side of things, I can also tell you if that did become a problem airspace and licensing would change.

Re: SureFly – a personal helicopter designed for safe and easy flight

#98
Is there any data on the sound profile of this thing? As the rotors become smaller the disc loading increases, making them much louder and more shrill. If that's effectively mitigated here, this looks really cool; if not, I think it will be hard to negotiate take off and landing rights with most communities.

Re: SureFly – a personal helicopter designed for safe and easy flight

#99
post #73
post #21

Why this and not single-rotor collective pitch? There's no good explanation in the marketing material.

That's the whole point of these drone-like copters: instead of one engine and main rotor with mechanically complicated collective pitch, you have many fixed-pitch variable speed rotors sitting directly on an electric motor. The complexity thus wanders from hardware to control software.

Having written both (albeit only at a hobby scale), I'd argue that the control software for a collective-pitch helicopter is substantially more complex than for a quadcopter, and especially this style of over/under counter-rotating octocopter. To me this almost seems like an effort to simplify the automation and control software at the expense of safety and efficiency.

I do agree that the mechanicals are much simpler. I can see some maintenance and inspection safety gains but the airframe as a whole seems more dangerous. The over/under counterrotating prop design is both inefficient and prone to cascading failures mandating deployment of the airframe parachute.

Re: SureFly – a personal helicopter designed for safe and easy flight

#100
post #95

Earlier quoted context omitted.

Don't today's drones and airplanes demonstrate that automating flying is a lot easier than automating driving?

That might stop being true if the air is as crowded as the roads.

As long as they're all outfitted with transponders, and piloting is automated, I don't see that being an issue.
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