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Apple iPhone 15 Pro and 15 Pro Max Review: Love at First Zoom

Apple’s iPhone 15 Pro and 15 Pro Max are defined by their refinements: a lighter body made from titanium, a USB-C port for charging and fast data transfers, a processor capable of console games and, on the Pro Max, a new 5x telephoto zoom camera.

I’ve reviewed and tested iPhones for years, but Apple’s new iPhone 15 Pro Max is the first time I’ve ever been this enamored. (The iPhone 12 Mini is a close second.) Both phones, along with the iPhone 15 and 15 Plus and new Apple Watches, are now available in stores.

I tested the iPhone 15 Pro and 15 Pro Max for five days, but it wasn’t until I was photographing a bodega cat named Kit Kat that I realized just how many improvements these phones have. They are brimming. After I took Kit Kat’s picture, I saw the option to turn his image into a portrait mode photo. It’s a minor detail but one with a significance: Nearly any photo can now be a portrait photo. And this isn’t even the biggest addition.

Apple gave its Pro models a glow-up with a refreshed lighter build, a new shortcut button and the world’s smallest processor. And it did all this while managing to keep that tried-and-true iPhone aesthetic front and center. In my time reviewing both phones, I recorded videos of penguins swimming, played the console game Resident Evil Village on the 15 Pro, gave the 15 Pro Max’s new zoom lens a spin atop a San Francisco Ferris wheel and tried, absentmindedly, to put a Lightning cable into the new USB-C port. Old habits, am I right?

iPhone 15 Pro Max

The iPhone 15 Pro and 15 Pro Max are defined by their refinements. This pair of phones is one of the most compelling releases from Apple in years.

But all this comes at a cost. While the 15 Pro costs $999 (£999, AU$1,849), the same price as the 2017 iPhone X, the barrier of entry for the 15 Pro Max is $100 more than it was last year. Apple got rid of the cheapest 128GB storage option leaving the $1,199 model with 256GB of storage as the new baseline. And that’s a price right on par with Samsung’s Galaxy S23 Ultra.

If you’re curious about the other phones Apple is launching, check out CNET Senior Editor Lisa Eadicicco’s review of the iPhone 15 and 15 Plus.

Pricing and storage comparison

Phone Storage US price UK price Australia price
iPhone 15 Pro 128GB $999 £999 AU$1,849
iPhone 15 Pro 256GB $1,099 £1,099 AU$2,049
iPhone 15 Pro Max 256GB $1,199 £1,199 AU$2,199
iPhone 15 Pro 512GB $1,299 £1,299 AU$2,399
iPhone 15 Pro Max 512GB $1,399 £1,399 AU$2,549
iPhone 15 Pro 1TB $1,499 £1,499 AU$2,749
iPhone 15 Pro Max 1TB $1,599 £1,599 AU$2,899

iPhone 15 Pro design embraces titanium and USB-C

The new titanium body is lovely, light and easy to hold thanks to its ever-so-slightly rounded edges. It feels less bulky than the straight-edged 12, 13 and 14 series. In fact, it’s almost like Apple merged the curved sides of the X, XS and 11 families with the blocky sides of recent years to find a Goldilocks-style middle ground with the 15 Pro and 15 Pro Max. That said, most people will likely put a case on the phone and not notice these changes at all.

There are two more major changes to the body. The first is the inclusion of a USB-C port instead of the Lightning port found on previous models. While the move definitely made headlines even before Apple announced it, in reality it’s not a radical change. I now plug in a USB-C cable (which comes with the phone) instead of a Lighting one. But it’s convenient to use the «one ring to rule them all» of charging cables.

Then there are the buttons. The volume buttons feel a bit more springy than the buttons on previous stainless steel Pro models. It’s like wearing a pair of foam-soled sneakers, where you get that extra spring in your step, rather than the airbag cushioning we had in shoes like the Nike Air Max back in the ’80s and ’90s. Both are comfortable, but the newer design with foam is more so.

iPhone 15 Pro Max

Goodbye mute switch, hello action button

The mute (or silence) switch is gone and replaced with an action button. By default it lets you silence your iPhone, but you can also customize it to turn on the flashlight, record a voice memo and open the camera, among other things. I especially liked having it open the camera. Once the app is open, the action button doubles as a physical shutter button to take a photo. But the simple fact that I can use the button to trigger a shortcut multiplies its possibilities.

The button only reacts to two kinds of input: a tap or a press. It can only trigger one feature at a time which seems limiting. I do hope that Apple opens this up and lets people program multiple presses and taps to trigger different presets. Like maybe two presses in a row launches a shortcut and one press silences the phone. Right now, the only way to change what the button does is to go into the Settings app, scroll down to the action button and change it there. Also I’d welcome the ability to add a Control Center button that gets me into this action button menu quicker.

Read more: This Is the Only Way You Should Turn On Your iPhone Flashlight

Like last year’s 14 and 14 Plus, the 15 Pros have a completely redesigned interior that makes it easier to repair. If the back glass is damaged, it should be faster and more affordable to have it replaced. Below is a comparison of how much it costs to replace the back glass on the new phone versus older Pro iPhone models.

Back glass replacement cost

Phone iPhone 15 Pro iPhone 15 Pro Max iPhone 14 Pro iPhone 14 Pro Max
Cost $169 $199 $499 $549

iPhone 15 Pro and iPhone 15 Pro Max

iPhone 15 Pro Max’s 5x zoom

Let’s just get this out of the way. The zoom lens on the small Pro is different from the one on the big Pro Max. The 15 Pro has a tried and true 3x telephoto camera like previous models. But the 15 Pro Max has a new 5x telephoto camera that’s made with multiple prisms and some clever engineering.

In contrast, there are a number of Android phones with periscope-style telephoto lenses that use a single prism to bounce light to the sensor, like the 10x zoom on the Samsung Galaxy S23 Ultra. The advantage to Apple’s design is that the lens takes up much less space and allows the image sensor to sit parallel with the lens, eliminating the restriction of having a telephoto image sensor that’s limited in size by the thickness of the phone.

Both Pro phones also have a larger 48-megapixel sensor on the main camera, which helps improve performance in low light. When I was photographing with the iPhone 15 Pro Max and 14 Pro Max after dusk, I noticed that the newer phone didn’t have to go into night mode as much. Also the photonic engine, Apple’s fancy-pants name for photo processing, seems to help with highlights more.

Take a look at some of my favorite photos that I took with the iPhone 15 Pro and 15 Pro Max.

A photo of a box office at a movie theater
Two great people
A photo of a boring clam
A cat in a window
People dancing
An iPhone 15 Pro taking a portrait

iPhone 15 Pro Max cameras vs. Pixel 7 Pro, Galaxy S23 Ultra

To test the versatility of these cameras, I decided to do a studio photo shoot with my CNET colleague, Abrar Al-Heeti, an award-winning journalist and connoisseur of tea parties. I grabbed photos of Abrar with the Pixel 7 Pro, Galaxy S23 Ultra, iPhone 15 Pro Max and iPhone 15 Pro. I did my best to frame her the same way for each phone.

Three portraits of Abrar
Three portraits of Abrar

Of the five photos, the 10x zoom photo from the S23 Ultra is my least favorite. The Pixel’s photo made the background dark and smoothed out the paper’s textures and flaws behind Abrar. In terms of her skin, both the iPhone 15 Pro and 15 Pro Max skewed her complexion warmer while retaining the most detail.

The Samsung’s 3x optical zoom shot looks wonderful, but has a heavy amount of skin smoothing, which some people prefer. And the Pixel did the best at accurately capturing Abrar’s skin in terms of color and detail. Again, all of these photos are good. However, the 15 Pro Max and Pixel images are my favorites.

Two portraits of Abrar
Two portraits of Abrar

I also decided to take the 15 Pro Max, the Pixel and S23 Ultra up on a Golden Gate Park Ferris wheel in San Francisco. It was overcast and there was fog (ah, San Francisco summers!), and those conditions challenged all three phones. But the Galaxy S23 Ultra was at even more of a disadvantage.

While the Pixel 7 Pro and iPhone 15 Pro Max both have a 5x optical zoom, in order to match it on the S23 Ultra, I set it to 5x digital zoom and, as you can see below, the results weren’t great. The Pixel fared better, but notice the detail in the trees looks muddy compared to what the iPhone grabbed. None of these photos are great but the iPhone’s snap is the best of the three.

Three photos of the University of San Francisco
Three photos of the University of San Francisco

But wait, Samsung has something the other phones don’t: a 10x optical zoom. It gets much closer. The quality isn’t great, but it looks better than the iPhone 15 Pro Max’s 10x digital zoom. The Galaxy S23 Ultra photo is fighting against that fog and the contrast is heavy-handed.

A photo of the University of San Francsico
A photo of the University of San Francsico

Also if, like me, you’re wondering what that building is, it’s the University of San Francisco. But at the time I didn’t know. So I used the iPhone’s Visual Lookup tool to find out. While the iPhone did identify it as a landmark, it couldn’t actually tell me what it was. In fact, it shared a photo of Sa’at Tower in Iran. So, I hopped on my Pixel, used Google Lens, and found out correctly that it was the university, which adds up since I live in San Francisco, not Iran.

Changing a photo's focal point on the iPhone 15 Pro Max

iPhone 15 Pro portraits are a no brainer

Then there’s portraits in photo mode which let you take a regular photo and change it to a portrait mode pic after the fact for certain subjects (humans, dogs and cats). Here’s a photo I took of Kit Kat the bodega cat in photo mode. Remember him from the beginning? I can turn portrait mode on, adjust the aperture to keep his whiskers in focus and even apply portrait lighting effects.

iphone-15-pro-max-kit-kat-portrait

But I can also change focus after the fact. Check out the ’90s grunge band photos of me and my pal Beacham. I can change the focus from me to him after I take the photo. This is going to be a killer feature for parents.

I’m also happy to say that the new lens coating on the 15 Pro and 15 Pro Max helps reduce light source reflections. On the whole if there is a reflection or lens flare it’s minimal at best and usually a single point.

A photo of people walking at sunset

In night mode, I did get some strange light streaking when using the 5x telephoto camera on the 15 Pro Max with string lights and a lamp inside a bar. I wonder if it has something to do with the prisms used for the lens. But to be clear, out of the hundreds of photos I’ve taken only three had these streaks.

A night mode photo of a sidewalk with string lights
A night mode photo of a bar

Video recordings look good. I’m excited about being able to record in log format, which makes footage look flat with desaturated colors. Recording in log gives more leeway to make iPhone videos match the color with footage from other cameras you use, versus baking in the color into the video file. I can see using Apple log videos for films where you’re using multiple cameras from different brands or in social media videos, like the one we made for this review.

Playing Resident Evil Village on an iPhone 15 Pro

The iPhone 15 Pro is the next gaming console

The brain behind everything on the 15 Pro and 15 Pro Max is the new A17 Pro chip. Its processing and graphics performance is best shown off with video games. And I’m not talking about Candy Crush.

The 15 Pro and 15 Pro Max support full console games like Resident Evil Village, which I got to test… well, at least the beginning. Resident Evil Village looks phenomenal on the 15 Pro Max’s screen, especially in terms of the lighting and shading. In my time, and through my casual gamer’s eyes, I was impressed. It speaks volumes that games like this can come to the iPhone.

I’m not even a week into using the new iPhones, so I still need to run CNET’s array of battery drain and charging tests. But I can share how the battery has fared so far. For the most part the 15 Pro Max’s battery made it through a full day of use (from 7 a.m. to 10 p.m) usually ending the day with 20 to 25% to spare. On perhaps the most demanding day I spent with the phone (taking photos, recording videos and with the screen at max brightness) the 15 Pro Max started out with a full battery in the morning and had 7% left by the end of the day.

I did run a wired charging test with both the 15 Pro and Pro Max. I used the included USB-C cable that comes in the box and a Twelve South 20-watt wall charger. Over 30 minutes the 15 Pro’s battery went from 4% to 66% and the 15 Pro Max recharged from 7% to 56%. Both phones support wired charging up to 27 watts which I plan to test and will update this review with the results.

The iPhone 15 Pro and 15 Pro Max also support 15-watt wireless charging via MagSafe or Qi2. I tested both on a Belkin BoostCharge Pro stand. Over 30 minutes, the 15 Pro went from 30% to 52% and the 15 Pro Max went from 7% to 28%, which are remarkably similar results.

iPhone 15 Pro Max in StandBy mode

The iPhone 15 Pro is home for iOS 17

If the A17 Pro chip is the brains, then iOS 17 is the 15 Pro and 15 Pro Max’s soul. The new OS is filled with lots of small quality of life improvements throughout. StandBy mode has won me over. I love being able to have my lock screen show the time in alarm clock-size numbers, app widgets or photos while it charges. The interface is clean and contemporary and breathes new life into the iPhone.

I also love making custom stickers from photos and live photos in Messages. It makes communicating with friends and family even more expressive. Autocorrect on the keyboard works so well for me. I’m usually a horrible phone typist, but this new autocorrect gets me. And I don’t even curse that much.

Read more: iOS 17 Review: StandBy Mode Changed My Relationship With My iPhone

At the end of the day, I am impressed with the iPhone 15 Pro and 15 Pro Max. I recommend both for anyone coming from a 12 Pro, 12 Pro Max or older. If you’re trying to decide between the 15 Pro and the 15 Pro Max, that 5x telephoto on the Pro Max is compelling. But if you don’t take a lot of zoomed in photos, it might be best to stick with the smaller Pro size. Also, if you’re considering buying either phone there are a number of trade-in discounts you should consider.

iPhone 15 Pro specs vs. iPhone 15 Pro Max, Google Pixel 7 Pro, Galaxy S23 Ultra

iPhone 15 Pro iPhone 15 Pro Max Google Pixel 7 Pro Galaxy S23 Ultra
Display size, tech, resolution, refresh rate, brightness 6.1-inch OLED; 2,556×1,179 pixels; 120Hz adaptive 6.7-inch OLED; 2,796×1,290 pixels; 120Hz adaptive 6.7-inch OLED display, QHD+ (1,440×3,120 pixels), 120Hz refresh rate, 1,500-nit brightness 6.8-inch AMOLED; 3,088×1,440 pixels; 120Hz adaptive
Pixel density 460 ppi 460 ppi 512 ppi 500 ppi
Dimensions (inches) 2.78 x 5.77 x 0.32 in 3.02 x 6.29 x 0.32 in 6.4 x 3.0 x 0.3 in 3.07 x 6.43 x 0.35 in
Dimensions (millimeters) 70.6 x 146.6 x 8.25 mm 76.7 x 159.9 x 8.25 mm 162.9 x 76.6 x 8.9 mm 78 x 163.3 x 8.9 mm
Weight (grams, ounces) 187 g (6.6 oz) 221 g (7.81 oz) 212g (7.5 oz) 234 g (8.25 oz)
Mobile software iOS 17 iOS 17 Android 13 Android 13
Camera 48-megapixel (wide), 12-megapixel (ultrawide), 12-megapixel telephoto (3x optical) 48-megapixel (wide), 12-megapixel (ultrawide), 12-megapixel telephoto (5x optical) 50-megapixel (main), 12-megapixel (ultrawide), 48-megapixel (telephoto) 200-megapixel (wide), 12-megapixel (ultrawide) 10-megapixel (telephoto) 10-megapixel (telephoto)
Front-facing camera 12-megapixel 12-megapixel 10.8-megapixel 12-megapixel
Video capture 4K 4K 4K 8K
Processor A17 Pro A17 Pro Google Tensor G2 Qualcomm Snapdragon 8 Gen 2 for Galaxy
Storage 128GB, 256GB, 512GB, 1TB 256GB, 512GB, 1TB 12GB RAM + 128GB, 256GB, 512GB 8GB + 256GB; 12GB + 256GB; 12GB + 512GB; 12GB + 1TB
Expandable storage None None None None
Battery Undisclosed; Apple claims up to 23 hours of video playback (20 hours streamed) Undisclosed; Apple claims up to 29 hours of video playback (25 hours streamed) 5,000 mAh 5,000 mAh (45W wired charging)
Fingerprint sensor None (Face ID) None (Face ID) In-display In-display
Connector USB-C USB-C USB-C USB-C
Headphone jack None None None None
Special features 5G (mmw/Sub6), Action Button, Always-On display, IP68 rating, MagSafe, Dynamic Island, 5x optical zoom (120mm equivalent),satellite connectivity, eSIM, Thread networking technology 5G (mmw/Sub6), Action Button, Always-On display, IP68 rating, MagSafe, Dynamic Island, 5x optical zoom (120mm equivalent),satellite connectivity, eSIM, Thread networking technology 5G, Magic Eraser, Photo Unblur, Real Tone, Face Unblur, Long Exposure Mode, Action Pan; Hold For Me, Wait Times, Direct My Call Live Translate, 5G (mmw/Sub6), IP68 rating, wireless PowerShare to charge other devices, integrated S Pen, 100x Space Zoom, 10x Optical Zoom, UWB for finding other devices
US price off-contract $999 (128GB, $1,099 (256GB), $1,299 (512GB), $1,499 (1TB) $1,199 (256GB), $1,399 (512GB), $1,599 (1TB) $899 (128GB + 12GB) $1,200 (12GB/256GB)
UK price £999 (128GB), £1,099 (256GB), £1,299 (512GB), £1,499 (1TB) £1,199 (256GB), £1,399 (512GB), £1,599 (1TB) £849 £1,249 (12GB/256GB)
Australia price AU$1,849 (128GB), AU$2,049 (256GB), AU$2,399 (512GB), AU$2,749 (1TB) AU$2,199 (256GB), AU$2,549 (512GB), AU$2,899 (1TB) AU$1,299 AU$1,949 (12GB/256GB)

How we test phones

Every phone tested by CNET’s reviews team was actually used in the real world. We test a phone’s features, play games and take photos. We examine the display to see if it’s bright, sharp and vibrant. We analyze the design and build to see how it is to hold and whether it has an IP-rating for water-resistance. We push the processor’s performance to the extremes using both standardized benchmark tools like GeekBench and 3DMark, along with our own anecdotal observations navigating the interface, recording high-resolution videos and playing graphically intense games at high refresh rates.

All the cameras are tested in a variety of conditions from bright sunlight to dark indoor scenes. We try out special features like night mode and portrait mode and compare our findings against similarly priced competing phones. We also check out the battery life by using it daily as well as running a series of battery drain tests.

We take into account additional features like support for 5G, satellite connectivity, fingerprint and face sensors, stylus support, fast charging speeds, foldable displays among others that can be useful. And we of course balance all of this against the price to give you the verdict on whether that phone, whatever price it is, actually represents good value. While these tests may not always be reflected in CNET’s initial review, we conduct follow-up and long-term testing in most circumstances.

Technologies

Today’s NYT Mini Crossword Answers for Monday, May 19

Here are the answers for The New York Times Mini Crossword for May 19.

Looking for the most recent Mini Crossword answer? Click here for today’s Mini Crossword hints, as well as our daily answers and hints for The New York Times Wordle, Strands, Connections and Connections: Sports Edition puzzles.


Today’s NYT Mini Crossword is pretty easy. 5-Across, «one for whom every day is Boxing Day,» stumped me because I really wanted the answer to have something to do with cats. (Spoiler: It did not.) Need some help with today’s Mini Crossword? Read on. And if you could use some hints and guidance for daily solving, check out our Mini Crossword tips.

The Mini Crossword is just one of many games in the Times’ games collection. If you’re looking for today’s Wordle, Connections, Connections: Sports Edition and Strands answers, you can visit CNET’s NYT puzzle hints page.

Read more: Tips and Tricks for Solving The New York Times Mini Crossword

Let’s get at those Mini Crossword clues and answers.

Mini across clues and answers

1A clue: Network satirized on «30 Rock,» for short
Answer: NBC

4A clue: Sport played on horseback
Answer: POLO

5A clue: One for whom every day is Boxing Day?
Answer: MOVED

6A clue: Like correct letters in Wordle
Answer: GREEN

7A clue: Blend together
Answer: MELD

Mini down clues and answers

1D clue: «Invisible Man» or «Little Women»
Answer: NOVEL

2D clue: Run in the wash
Answer: BLEED

3D clue: What bourbon whiskey is primarily made from
Answer: CORN

4D clue: Tiny hole in the skin
Answer: PORE

5D clue: Longtime movie studio acquired by Amazon in 2022
Answer: MGM

How to play more Mini Crosswords

The New York Times Games section offers a large number of online games, but only some of them are free for all to play. You can play the current day’s Mini Crossword for free, but you’ll need a subscription to the Times Games section to play older puzzles from the archives.

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Technologies

Today’s NYT Connections: Sports Edition Hints and Answers for May 19, #238

Hints and answers for the NYT Connections: Sports Edition puzzle, No. 238, for May 19.

Looking for the most recent regular Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle and Strands puzzles.


Connections: Sports Edition might be tough today if, like me, you don’t know what «loge» means. Read on for hints and the answers.

Connections: Sports Edition is out of beta now, making its debut on Super Bowl Sunday, Feb. 9. That’s a sign that the game has earned enough loyal players that The Athletic, the subscription-based sports journalism site owned by the Times, will continue to publish it. It doesn’t show up in the NYT Games app but now appears in The Athletic’s own app. Or you can continue to play it free online.  

Read more: NYT Connections: Sports Edition Puzzle Comes Out of Beta

Hints for today’s Connections: Sports Edition groups

Here are four hints for the groupings in today’s Connections: Sports Edition puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Brag.

Green group hint: Where’s my seat?

Blue group hint: City that never sleeps.

Purple group hint: Opposite of go.

Answers for today’s Connections: Sports Edition groups

Yellow group: Boast

Green group: Stadium seating sections

Blue group: New York Knicks

Purple group: ____ stop

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections: Sports Edition answers?

The yellow words in today’s Connections

The theme is boast. The four answers are crow, gloat, grandstand and showboat.

The green words in today’s Connections

The theme is stadium seating sections. The four answers are bleacher, loge, suites and upper deck.

The blue words in today’s Connections

The theme is New York Knicks. The four answers are Bridges, Hart, McBride and Towns.

The purple words in today’s Connections

The theme is ____ stop. The four answers are back, jump, pit and short.

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Technologies

Blade Runner: 18-Rotor «Volocopter» Moving from Concept to Prototype

It may look "nutty" and like a "blender," but the designers say the craft could challenge helicopters

Inventor and physicist Thomas Senkel created an Internet sensation with the October 2011 video of his maiden—and only—test flight of a spidery proof-of-concept 16-rotor helicopter dubbed Multicopter 1. Now the maker of the experimental personal aviation craft, the European start-up e-volo, is back with a revised «volocopter» design that adds two more rotors, a serial hybrid drive and long-term plans for going to 100 percent battery power.

The new design calls for 1.8-meter, 0.5-kilogram carbon-fiber blades, each paired with a motor. They are arrayed around a hub in two concentric circles over a boxy one- or two-person cockpit.

After awarding the volocopter concept a Lindbergh Prize for Innovation in April, Yolanka Wulff, executive director of The Charles A. and Anne Morrow Lindbergh Foundation, admitted the idea of the multi-blade chopper at first seems «nutty.» Looking beyond the novel appearance, however, she says, e-volo’s concept excels in safety, energy efficiency and simplicity, which were the bases of the prize.

All three attributes arrive thanks largely to evolo’s removal of classic helicopter elements. First, the energy-robbing high-mass main rotor, transmission, tail boom and tail rotor are gone. The enormous blades over a normal chopper’s cabin create lift, but their mass creates a high degree of stress and wear on the craft. And the small tail rotor, perched vertically out on a boom behind the cabin, keeps the helicopter’s body from spinning in the opposite direction as the main blades, but it also eats up about 30 percent of a helicopter’s power.

The volocopter’s multiple rotor blades individually would not create the torque that a single large rotor produces, and they offer redundancy for safety. Hypothetically, the volocopter could fly with a few as 12 functioning rotors, as long as those rotors were not all clustered together on one side, says Senkel, the aircraft’s co-inventor and e-volo’s lead construction engineer.

Without the iconic two-prop configuration, the craft would be lighter, making it more fuel efficient and reducing the physical complexity of delivering power to the top and rear blades from a single engine. Nor would the volocopter need an energy-hungry transmission. In fact, «there will be no mechanical connection between the gas engine and the blades,» Senkel says. That means fewer points of energy loss and more redundancy for safety.

E-volo’s design eliminates the dependence on a single source of power to the blades. As a serial-hybrid vehicle, the volocopter would have a gas-fueled engine, in this case an engine capable of generating 50- to 75 kilowatts, typical of ultralight aircraft. Rather than mechanically drive the rotors, the engine would generate power for electric motors as well as charge onboard lithium batteries. Should it fail, the batteries are expected to provide enough backup power so the craft could make a controlled landing.

Whereas helicopters navigate by changing the pitch of the main and tail rotor blades, the volocopter’s maneuverability will depend on changing the speed of individual rotors. Although more complex, it is more precise in principle to control a craft using three to six redundant microcontrollers (in case one or more fails) interpreting instructions from a pilot using a game console–like joystick—instead of rudder pedals, a control stick and a throttle.

Wulff’s first impression about the volocopter’s design is not uncommon. E-volo’s computer-animated promotional videos of a gleaming white, carbon-fiber and fiberglass craft beneath a thatch of blades recall the many-winged would-be flying machines of the late 19th century. This point is not lost on Senkel.

«I understand these skeptical opinions,» he says. «The design concept looks like a blender. But we really are making a safe flying machine.»

That would be progress in itself. Multicopter 1 looked like something from an especially iffy episode of MacGyver, complete with landing gear that involved a silver yoga ball. Senkel rode seated amid all those rotors powered only by lithium batteries. Multicopter 1 generated an average of 20 kilowatts for hovering and was aloft for just a few minutes.

There’s a reason why the experimental craft flew briefly and only once.Senkel describes that first craft as «glued and screwed together.» Seated on the same platform as the spinning blades, he says, «I was aware of the fact that I will be dead, maybe. Besides, we showed that the concept works. What do we win if we fly it twice?» he asks rhetorically.

Other than putting the pilot safely below the blades, the revised volocopter design would operate largely the same as the initial prototype. The design calls for three to six redundant accelerometers and gyroscopes to measure the volocopter’s position and orientation, creating a feedback loop that gives the craft stability and makes it easier to fly, Senkel says.

The volocopter’s revised prototype under construction could debut as soon as next spring. The first production models, available in perhaps three years, are expected to fly for at least an hour at speeds exceeding 100 kilometers per hour and a minimum altitude of about 2,000 meters, still far shy of standard helicopter’s normal operating altitude of about 3,000 meters. «This could change our lives, but I don’t expect anything like that for 10 years,» Senkel adds.

Given that most of the technology needed to build the volocopter is already available, «this idea is fairly easy to realize,» says Carl Kühn, managing director of e-volo partner Smoto GmbH, a company that integrates electric drive systems and related components.

Like Senkel, Kühn has modest short-term expectations despite his repeated emphasis on the standard nature of the technology involved. «I guess that e-volo will have [a prototype] aircraft in three years that can do the job—that it will lift one or two persons from one point to another,» he says.

The biggest immediate limitations appear to be regulatory. For instance, European aviation regulators consider any electrical system greater than 60 volts to be high voltage and regulate such systems more aggressively, Kühn says. As a result, the volocopter will operate below that threshold. The craft will also need to weigh no more than 450 kilograms to remain in the ultralight category, which is likewise subject to fewer government aviation regulations, according to Senkel.

The Lindbergh Foundation’s Wulff says the organization’s judges felt e-volo had «a greater than 50 percent chance of succeeding, or they wouldn’t have given them the innovation award.» Asked if she would line up to fly one someday, she says, «I sure would. It looks very compelling to me.»

Follow Scientific American on Twitter @SciAm and @SciamBlogs.Visit ScientificAmerican.com for the latest in science, health and technology news.
© 2012 ScientificAmerican.com. All rights reserved.

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