Recent content by Technologist

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    My idea for electric planes instead of high speed rail

    Depends, for E-VTOL you can keep on stacking landing pads at a vertiport in a vertical direction, as I've alluded to previously that will get the passengers be hour equivalent to a major station with less footprint than an above ground station. In very dense urban areas you will probably still...
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    My idea for electric planes instead of high speed rail

    You are of course both experts in aviation..... It's not just Uber who is working on electric aviation, it's Airbus, Boeing, Rolls-Royce, Siemens. Karem aerospace (previous work was developing the Predator drone) has now designed an E-VTOL which meets Uber's mission requirements with off the...
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    My idea for electric planes instead of high speed rail

    The noise profile is somewhat different to ground transport, once these things are up at around 100m or so they cease to be audible over the background noise in most cities. Over 1000m and they won't be audible in the countryside. It is therefore preferable to ground based transport which is...
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    My idea for electric planes instead of high speed rail

    This I actually agree with, provided they can get the horizontal speed up to ~15-20mph and come up with some method by which the pod get up to speed off the main route.
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    My idea for electric planes instead of high speed rail

    HSTE'd you don't seem to be getting the business model. As a passenger you are effectively getting on public transport, the E-VTOL craft can go from one approved and designated place to another via a route that is approved and evaluated for safety. The passenger will not have a method of...
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    My idea for electric planes instead of high speed rail

    You can hire helicopters today, they are much easier to hijack or blow up.You are vastly underestimating the difficulties of creating a improvised weapon out of an aircraft. I don't know what you're picturing as far as a method of use for one of these things, but you aren't going to be able to...
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    My idea for electric planes instead of high speed rail

    20 seats is probably more people than board the average train at any given station outside the top 10 rail stations in the UK. In fact lets do the maths: Liverpool Lime Street is number 10 at 15 million per year: Assume weekend is 50% capacity 1,500,000/(52*6.5)=44,500 per day Assume 18 hour...
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    My idea for electric planes instead of high speed rail

    Sense and avoid principally relies on GPS and off board radar, the principal sensor on the actual aircraft is simply a few cameras. Even Lidar/radar scanners are down at the 10k cost level before economies of scale kick in. Again I refer you back to the first principles argument, a 4-5 seat...
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    My idea for electric planes instead of high speed rail

    Helicopters are banned for two reasons, one they look and occasionally are dangerous. Secondly they tend to have poor public perception (they are for example perceived to be much nosier than they actually are), as most people have never flown in one. E-VTOL will need to demonstrate significant...
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    My idea for electric planes instead of high speed rail

    You make lots of points, these are all addressed by Uber in their white paper or in much greater detail at either of their conferences. Their proceedings are worth watching. What is notable is that this isn't just Uber established people like Boeing, Airbus and Embraer are developing these...
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    My idea for electric planes instead of high speed rail

    Current rules already permit much reduced security scanning for aircraft less than 20 seats flying internal routes, there is no need to search people flying on light aircraft. In the case of E-VTOL or electric regional aircraft there is no chance that the passengers will be able to take control...
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    My idea for electric planes instead of high speed rail

    I copied the wrong number 3.5 million was for 10 years which is a conservative vehicles life. 350,000 miles a year was a more accurate and fairly conservative number. The vehicle cost contribution of 7-28p/m is still accurate. As for the $250,000 cost, think about this from first principles...
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    My idea for electric planes instead of high speed rail

    5000 passengers per hour is around 15.6 million passengers per year, (assuming 20 hour operation, a peak to average ratio of 50% and 50% capacity at the weekend) this would put such as station in the top 20% of London underground stations. There is no reason why such a Skyport could not be...
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    My idea for electric planes instead of high speed rail

    Nope that's just a pure at cruise number, take-off and landing are more energy intensive as is climb however both a pretty brief. E-VTOL's are likely to fly at around 500-1500m, regional electric aircraft are more likely to fly at 1500-4000m. That Zunum aircraft will likely fly more like...
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    My idea for electric planes instead of high speed rail

    But there is no requirement for them to fly in formation or go to the same place or fly half empty! Most likely an extension to an Uber like app would aggregate demand and schedule flights dependant on how flexible people are on their timings and how much they are prepared to pay. Uber used...

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