“[Customers] wanted range, so we felt, let’s start at range and we can work our way back in,” Bell CEO Mitch Snyder told journalists during a December press visit to the company's headquarters. “And from the discussions, we felt there were really becoming two distinct requirements, one for inner-city movement and one for more range.”
With demand growing for inner-city aerial transit, Bell is pivoting toward that mission with the Nexus 4EX. Designed to maximize efficiency in forward flight, which is crucial now that the aircraft is fully electric, the 4EX has two fewer rotors and a longer back wing to provide more lift.
Bell is targeting a 60-mile range for 4-5 passengers and luggage, including reserves and multiple takeoffs and landings. Innovation lead Scott Drennan expects that by the time the Nexus 4EX is operation in the “mid-to-late 2020s,” energy storage density will have improved roughly 10-15 percent, allowing the design to hit these targets.
It's not about safety. That is mainly a certification aspect and dependent on what is considered as acceptable... Btw, are four rotors "safe"?
Yeah, more like an F-35 lift fan than a rotor. (Though closer to the latter than the former given the differences in HP.)Well the enclosed rotors are much better for operating in urban areas I would assume. I don't know that they are significantly quieter than a TR, but would imagine the impulse is less since the blade tips are enclosed. I recall reading/hearing that the X-22A made a loud buzzing noise, but cannot confirm that. Biggest drawback that comes to mind is a similar (possibly more intense?) downwash/outwash.
They're very efficient in the hover, so if you're just going do a lot of hovering or slow speed flight they're great. Of course, one of the reasons they like them for vehicles like this is safety. There aren't tips passengers or people walking around them can't see. Everything is enclosed within the duct.The drag of ducted props / fans is enormous. They're one of the technologies that we all hear about that promise so much ....until you speak to anyone that's ever been involved in their use
Hmm, or something like that ...But they look so cool. Maybe X-19 instead of X-22?The drag of ducted props / fans is enormous. They're one of the technologies that we all hear about that promise so much ....until you speak to anyone that's ever been involved in their use
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Some pics of it attached...
Surely aerodynamically, this flow turning amounts to an asymmetric lift force on the duct—even if the normal term of art is ram / intake momentum drag—because turning requires circulation & circulation is lift?
I don't have preferences. However, my concern is that tilt-rotors add another layer of complexity, due to the tilt mechanism, the variable pitch mechanism and the necessity to control both.
According to their website they were flight testing full scale production prototypes for 2 years and are in the process of type certification.Toyota invests in Joby Aviation:
Joby Aviation has been beavering away hammering out the designs and flight dynamics of its awesome-looking tilt-rotor eVTOL for more than 10 years. Now, Joby's got over half a billion dollars in the bank thanks to an investment round led by Toyota.newatlas.com