Flying cars ... finally here!

At first I had the same thought. But the powered wheels description applied to the prototype, the gray version at the airshow with just one ducted fan prop. And they admitted they needed a total redesign to “meet their speed targets”. Which is aviation-speak for: a) too draggy, but even more than that: b) underpowered.

V2 looks like darn near a clean sheet design, inheriting little beyond the concept from V1. It’s clearly a bunch heavier and now has 2 props. They carefully said nothing about whether that means a bigger ICE engine / battery / fuel tank and all the weight, size, and cost spiralling that growth inevitably triggers.

It clearly means two electric motors of some unknown power rating vs. just 1. They also did not specify whether the powered wheels are a feature retained in v2. They may not even know yet.


Here’s a different take unrelated to the above.
Given that this is a car and the road wheels are powered anyhow, there’s not a weight penalty to using that power during takeoff. Sort of like an afterburner: it’s lots of extra acceleration for very little (in the case of an AB) or zero (in the case of this thing) incremental weight. Trying to add powered wheels to an airliner or a Cessna would be a very different tradeoff involving adding a lot of weight and complexity that would not already exist.

So powered wheels on takeoff may not be the damning indictment of climb performance that it first appears. I’m assuming, like standard HEV car design, that they’ve sized the ICE for the cruise condition with some small excess power for climb / acceleration. Upon which they add a peaking battery for takeoff, early climb, and hard road acceleration.


Finally:
Watching the red CAD/CAM mockup articulate from road to flight and back was horrifying to watch. Way too many moving parts. Every one of which needs dual redundant locking mechanisms, and multiple actuators to move the parts and the locks. Makes the STOVL F-35B look almost sensible by comparison. There went the (fairly reasonable) cost target.

The Moeller Skycar will be flying before this ridiculous thing is. And it would classify this as a “roadable aircraft” rather than a flying car, since it will require driving to and from an airport (or at least a designated civil airstrip) instead of being able to take off and land in any open area.

Stranger

Given that the two props and their engines fold away for ground operation, it seems likely (essential?) that powered wheels were retained.

I agree that this design looks like it includes an impressive number of linkages and moving parts, which may not all wish to operate properly all the time.

Agreed with your points. It was a concern, but whether it’s an indication of a serious design limit or not depends on the details. Wouldn’t be a problem if the goal was to give them super-short field takeoff performance.

It’s kinda silly, but since the wheels are going to be pretty high powered, the craft could intentionally use a far higher takeoff speed than required so as to give itself extra kinetic energy–like shooting a paper airplane with a rubber band. Might overcome some of the safety issues with underpowered props.

It’s already flying, though:

I don’t think the Moller Skycar ever got out of ground effect, or off a tether.

That said, it looks like the articulation parts of their prototype aren’t functional.

What happens when the wings accidentally fold in midair?

A bit of tape over the wing-folding button should do the trick:

Yeah, I mean as an actual road-drivable vehicle that can fold up like a gadget in a Bond film as shown in the link in @PastTense’s post, not with a fixed wing and powerpack. Anybody who is reasonably handy can build an experimental light aircraft but the ‘vehicle’ portrayed in the link is implausible and clearly notional. It’s frankly not even a very good animation for a product that is in “pre-production”.

Stranger

You deploy the parachute. Yes, it comes with a whole-vehicle parachute which is probably a good idea given everything else about this.

I popped up to their website and got a bit more information. So… a couple of things:

  1. As noted, you have to build at least 51% of this yourself. So the kit costs 170,000-195,000 and then you can factor in your time, needed tools and supplies, a place to build this thing… It’s doable. I know quite a few people who built their own kit planes but it’s not something the average person is going to want to do. Hell, it’s not even something the average pilot is going to want to do. My reluctance to build a kit plane myself had a lot to do with why I wound up renting Cessnas and Pipers.

  2. This does not meet the limits for an ultralight aircraft so you will need some sort of training and licensing to fly this anywhere even in the US with its somewhat insane Part 103 (I include myself in that remark - I got my start in ultralights)

  3. This does not meet the limits for a Sport Pilot aircraft so you will need a full private pilot license. I’ll give 'em credit - they state that straight up on their website with no beating around the bush. You need a driver’s license for the road and private pilot’s license for the sky. Although there has been talk of increasing the weight limit for Sport, which would cover this thing, to the best of my knowledge that hasn’t happened yet and might never happen.

  4. The “good” news, if you can call it that, is that by building this at least 51% yourself you won’t need a multi-engine rating added to your private pilot license to fly this thing. The bad news is that because of the US regs around experimental homebuilt aircraft you can fly a multi-engine airplane you build yourself without needing a multi-engine rating. I’ll just point out that while hanging as many engines as you’d like off an ultralight is entirely allowable in the US multi-engine UL’s largely disappeared by the late 1990’s due to a lot of enthusiasts taking permanent dirt-naps. Just because you can doesn’t mean you should.

A couple other things regarding this thing:

The functional payload is about 575 pounds. That’s about the load capacity of a Cessna 150 (although the Switchblade is heavier overall). The C-150 is not exactly a popular aircraft because after you finish wedging two big, brawny, American men into it you have no payload capacity leftover for things like fuel. I flew the C-150 a lot back in the day but then I’m a small woman. You can put me and full fuel in the thing with payload capacity left over. You can put me, the average American adult male, and full fuel into one of those although the climb rate is going to sort of suck if the ambient temperature is above 40 degrees or your runway is more than a couple hundred feet above sea level. Limitations on carrying capacity is going to severely limit the appeal of this thing, and also the average driver is going to be clueless about things like weight and balance. Just as well you’ll need a pilot’s license to fly this thing.

They’re claiming an airborne cruising speed of 160 mph and a max of 200 mph. Although a lot of people fancy themselves formula one drivers going along at 200 mph is a bit different from normal highway speeds even if you define that as 100 mph. I’d been flying about 8 years when I first got my hands on a 200 mph airplane (Mooney) and I almost busted both Michigan City, Indiana and Midway Airport airspace in the same 15 minutes (which is why the owner was in the seat next to me making sure I didn’t get into too much trouble). It’s a lot harder to keep up with the aircraft and very easy to get lost at those speeds. Of course it all gets better with practice but there is a learning curve there that might surprise people.

They’re claiming an 1100 foot take off roll. OK. I can believe that is possible (actual practice is not always going to meet that standard, you might want to stick to 2000 foot runways or longer especially in warm weather or higher altitudes)

Landing distance 700 feet. OK, I can believe that is possible (actual practice is not always going to meet that standard, you might want to stick to 2000 foot runways or longer especially in warm weather or higher altitudes)

This is still giving me Small Cessna Vibes. By the way, you can get a C-150 in safe flying condition for $30,000 to $50,000 these days, if you were curious. Not very roadable but then there are also fewer moving parts of the aircraft which, to my mind, is a bonus because there’s less to go wrong. Sure, it doesn’t go as fast but, like I said, less to go wrong. Built before airframe parachutes were standard but they are available as a mod for the C-150 so if you’d like that security blanket you can have it, too.

Stall speed is 67 mph. Which is significantly higher than the C-150 but makes sense for the wingspan/weight of this thing. OK, that’s touching down at freeway speeds. Probably within the capacity of the average driver.

Fuel is 91 octane Premium autogas, apparently. 36 gallon tank. On the road it gets 33 mpg for an approximately 1100 mile range which is… well, that’s a nice range. My Toyota Echo only has about a 400 mile range under ideal conditions. So great, awesome road-range (just ignore minimal seating and almost no room for your gear). Airborne they’re claiming 9.5 gallons per hour for about a 3 hour range (assuming you’re adhering to recommended reserves), or about 500 miles at cruising speeds (you crank it up to 200 mph you won’t get 3 hours or 500 miles out of that amount of fuel).

For engine failure scenarios they’re claiming an 8:1 glide ratio. Um… maybe? Although with how low this sits to the ground I hate to try to land that in a field. I speak as someone who successfully landed a C-150 in a hayfield on one occasion. It wasn’t at all fun, really, and the way the C-150 sits up high on its gear with ample ground clearance was a significant factor in the success of that maneuver. With a 27 foot wingspan good luck landing that on the average road without hitting something alongside like telephone or light poles or on-coming traffic. For reference, interstate traffic lanes are 12 feet wide, this thing’s wingspan is more than twice that. Local roads typically have narrower lanes than that. You need 2.5 - 3 lane widths to land this thing without adding a road vehicle accident to your troubles. At least the C-150 wing sits high enough to clear road-side mailboxes even if it still has the problem of on-coming traffic and roadside poles.

Finally, there is a small market is re-selling homebuilt airplanes. Most of them are single-engine without a lot of complications so a private pilot license will allow to fly them. A new owner, however, will absolutely need a multi-engine add-on to their license. They just barely evade the high-performance requirement, at least with their base model.

All of that aside - this actually does look like it’s a viable thing, in that it has a certain level of performance on both road and in air and apparently they’ve made an actually flying protoype. The problem is cost.

I could buy TWO C-150’s AND a brand new Toyota for that price. Hell, I could buy a C-150, a new Toyota, and a one-bedroom condo in my area for that price. Or rent a hangar to keep that C-150 in. I could drive my Toyota to the airport to fly that C-150 and probably still have money left over. I could buy a four-seat Cessna or Piper with much better payload capacity for that price. Why would I buy this thing?

Or when the wings unfold on the highway?

I didn’t say what I was thinking very well. Thanks for the point-out.

Yes, the road wheels must be powered for use on the road. That’s for sure as you rightly point out. What I should have said was:

They also did not specify whether the powered wheels as a takeoff thrust / performance augmentation system are a feature retained in v2. They may not even know yet.

I think I would more afraid of driving that on the ground than flying it.

Been watching Top Gear episodes featuring the Reliant Robin, I take it?

By using the powered wheels for the initial takeoff roll, they can design the propellers just for climb and cruise. Even assuming that they’re variable-pitch, the amount of pitch change would be limited. That may save a little weight and complexity.

For some reason I used to think that all aircraft had powered wheels. Not sure where I got that from, but it stuck with me even after flying dozens of times commercially. It wasn’t until I took a trial pilot lesson in my mid 30’s that I realised how wrong I’d been for years.

There actually are various efforts afoot to add powered wheels to airliners. But just for taxi use. The idea being to dispense with the expensive tugs to push or pull airplanes into and out of gates, and to avoid lots of fuel burn spent mostly idling on the way to/from terminal and runway.

There are some hefty challenges about power density, weight, and traction. But it keeps being looked into precisely because of the fuel cost of conventional taxi.

Only the ones on treadmills. :rofl:

I remember a little toy airplane I had as a small child. It was battery powered, had lights and made lots of noise, and had a small motor turning the wheels to drive around the floor. I wonder if something like that just got stuck in your head.

I knew that the wheels are unpowered, but also steerable. I got a bit of a surprise while working for a company that built airplane floats. Lots of them had wheels that extended from the bottom of the float, but there was no steering linkage. The wheels on the front of the floats were free castering, like a shopping cart. The only way to steer on the ground was by applying the brakes to one side or the other.

I saw something once about tugs that could wrap around the nose gear of an airliner and tow the plane at higher speed than traditional tugs. I think it was for similar reasons to what you describe, a more efficient way to bring the plane from the ramp to the runway.

Its 0-1 deadstick glide rate is something which would give me pause. AIUI, there is a death zone between the ground, and sufficient altitude to deploy a ballistic parachute.

Typically nose gear is/are steerable, but mains are not. Some truly huge airplanes with multiple sets of main gear will pivot the aft set of mains at least some to minimize side scrubbing as the airplane pivots.

Back in the tailwheel era those all tended to be free-castering. Some designs for planes larger than light airplanes were semi-steerable, where they were connected to the rudder pedals for small amounts of throw, but could also break loose and swivel freely under enough side force. Some of those in turn had a manual locking mechanism to prevent the free swiveling under conditions like takeoff or landing where you want need the tailwheel to help provide lateral stability, not promote ground-looping. So you’d leave it unlocked for taxi out, lock for takeoff, ensure it’s still locked for landing, then release the lock for taxi-in.

As nose gear was introduced at least some lightplanes used a free-castering design and you steer those with differential braking. And even today some lightplanes, all homebuilts, still have freely castering nose gear. IIRC this was the last production lightplane with castering nose gear:


A so-called “SuperTug”. Here’s an example:

Not so much intended to move loaded airplanes to/from runways, but to allow the ground team to quickly and safely move airplanes from terminals to storage areas to maintenance hangars and back at a taxi-speed compatible with the airplanes, rather than the walking pace of tugs using towbars. It also ensures much greater control over the load.