When I arrived at NAB 2015 in Las Vegas, I went straight to the Freefly Systems’ booth to have a look at their new Freefly ALTA multirotor. I had high expectations, as I am very familiar with Freefly’s high standards and attention to detail. The first public details about ALTA had just been pushed to the web hours before the official beginning of NAB.
I was able to spend almost a half hour with two members of the Freefly staff. One is an experienced multirotor pilot and camera drone expert who is largely responsible for testing their platforms, and the other individual I spoke with is a member of the technical staff, and he was able to answer some of my more detailed questions. Finally, I also talked with Tabb Firchau, Freefly’s President, and he helped me clarify the answers to some of these questions.
Freefly have announced that the retail price of the ALTA is $8,495 in the USA. This price includes the ALTA and custom carrying case, but no radios. ALTA’s pre-order (refundable $1000 deposit) is now available (Freefly store preorder :: Quadrocopter store preorder).
Full disclosure: I paid the deposit and I am on the preorder waitlist. I did not receive a discount or any consideration for this purchase (or any other). This is an unbiased and professional review, and has not been influenced by anybody.
Here are some of my questions, and (paraphrased) the answers I got. Much of what I asked was outside the scope of what’s already been posted, so I’ve skipped over anything that’s already been addressed in marketing literature.
- Why a hex and not an octo?
Freefly wanted to be able to run larger props (the ALTA uses 18” props) than you could run on an octo.
- How about redundancy? What if you lose a motor?
The Synapse flight controller can compensate for the loss of a motor to a certain degree and you may be able to fly and land safely. Maneuverability is compromised, especially for yaw, but the copter can theoretically fly on 5 motors as long as the payload is not to near the max. Stated another way, this is not perfectly clear at this time.
- What kind of motors/ESCs does ALTA use?
Both are custom, proprietary designs. And both are optimized to significantly reduce noise. The props are still noisy when pushing air around, but everybody says it’s the quietest multirotor they’ve ever flown. Interestingly, the ESCs are integrated into the motor housing at the end of each boom, significantly reducing heat buildup. The LEDs on each boom are actually part of the ESCs.
- Whose props does ALTA use?
ALTA’s foldable propellers are completely custom Freefly products.
- How much power can the ALTA push?
Each ESC has been tested up to 60+ amps each at 6S. In its full payload configuration, the ESCs are pushing 25-30A each (for a total of 150-180A). With a small camera (like a GH4) and a MōVI M5, it’s closer to 20A each motor. Freefly have done extensive lab testing of these ESCs and believe they are the best performing ESCs ever flown in a multirotor.
- Is there any power isolation with the dual batteries?
No, the two batteries are run in parallel to independent inputs on the power distribution board, but they’re not isolated from one another.
- What about any other type of redundancy?
The ALTA features dual diversity SBUS inputs to the Synapse from the flight radios. You can put two RC receivers (such as Futaba or Spektrum) on the Synapse, and it will automatically choose the cleaner signal based on packet error data. There are also redundant bus signals run from the power distribution board and the Synapse to the ESCs so that if there is a signal disturbance on the bus the copter can still control the ESCs and motors.
- How does the GPS work with the MōVI top mounted?
Freefly says the boom-mounted GPS-antenna location is far enough out from under the gimbal that it gets a full complement of satellites even with the gimbal on top.
- What about telemetry and/or OSD?
Full OSD functionality (SD, not HD) is built into the Synapse. You route your FPV camera through the Synapse and it overlays a full (and customizable) complement of in-flight data on the way to your vTX.
- Does Synapse do Mikrokopter-style data logging?
- How does the live configuration work?
Through Bluetooth and (probably) wifi to a tablet or laptop on the ground. Range is quoted as “a couple hundred feet” and provides the ability to live-tune flight parameters in the air. Freefly reiterated that the reason there was never an iOS MōVI app was the incompability between Freefly’s Bluetooth hardware and iOS. This is why they’d like to do Wifi for ALTA to give iOS compatibility.
- Is it weatherproof?
Freefly describes the ALTA as “weather resistant”. The folks I talked to said they routinely fly it in a light rain and snow. The power components are all isolated, protected, and properly coated to avoid issues with moisture.
- What kind of batteries does it use?
ALTA is a 6S machine, and can use industry standard SUAS 6S (25V) LiPo batteries. However, given the power demands ALTA puts on the batteries, it’s best to run two batteries in parallel, and to make sure that the pair can supply adequate current to the copter’s power systems.
- What is the flight duration?
The Freefly staff I spoke to said they did virtually all of their testing with matched pairs of Freefly’s 9000 man 6S LiPo batteries (apparently now discontinued). They said they have not done extensive flight duration testing, but with “smaller cameras” such as GH4 and A7S on a MōVI M5 they get in excess of 15 minutes, and that “larger cameras” such as a RED on a MōVI M10 (near ALTA’s payload limit) they get roughly 10 minutes. These times will vary according to many factors and are not definitive yet.
Lastly, I have some photos for your perusal. These machines are all pre-production models, so they may differ in some ways, but I was assured that they’re nearly identical to the final version.
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