The OasisFly25 from Sub250 is an thrilling 2.5-inch FPV drone, outfitted with the DJI O3 air unit and weighing underneath 250g, making it excellent for compact, freestyle flying. This drone is sufficiently small to slot in your pocket but packs loads of energy. It’s designed for many who love the joys of freestyle flying in tight areas or parks. On this assessment, I’ll stroll you thru my expertise with the OasisFly25, together with its specs, efficiency, flight traits, and whether or not it lives as much as the hype.

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The place to Purchase

You should buy the OasisFly25 from these distributors:

The drone is obtainable with the DJI O3 system and a receiver put in, however there’s additionally a plug-and-play model if you wish to use a special FPV system and receiver.

Contained in the field, you’ll discover the drone and two accent containers containing:

• Two units of HQ 2.5×2.5×3 tri-bladed propellers
• Stickers and manuals
• Spare screws, standoffs, and a hex key
• 3D-printed digicam holders (together with one for a unadorned GoPro)
• USB-C adapter for the flight controller

Observe that batteries are bought individually: https://oscarliang.com/product-fmf7

Spare propellers: https://s.click on.aliexpress.com/e/_Dkaokyp

Specs

• Flight controller: F7 with 35A ESC, which is spectacular for a 2.5-inch drone
• Body: Sub250 Oasis Body, 135mm wheelbase, with 2mm prime plate and a pair of.5mm backside and arm thickness
• Flight controller: Redfox A3 F722 45A AIO
• Digital camera/VTX/Antenna: DJI O3 Air Unit
• Motors: Sub250 1404 4500kv
• Propellers: HQ2.5×2.5×3
• Receiver choices: PNP, TBS Crossfire Nano, ELRS 2.4G
• Battery connector: XT30
• Really useful battery: 4S 530-730mAh LiPo (not included)
• Weight: 174g (with out battery), 241g with 4S 720mAh

Construct High quality and Design

The OasisFly25 boasts a glossy and sturdy design, combining carbon fiber and CNC aluminum for power and stability. The straightforward, efficient design means it’s straightforward to take aside when you must restore it. The body options replaceable arms, permitting you to swap out damaged arms with no need to switch all the body. Spare body elements can be found on the Sub250 web site.

Weighing 174g and not using a battery and 241g with a 720mAh 4S pack, the drone is probably a bit heavy for a 2.5″ drone, however the construct may be very sturdy. The DJI O3 system gives a top-notch video feed, making this an excellent drone for recording high-quality footage.

The lengthy body physique design means the propellers aren’t seen within the FPV digicam’s view, so it doesn’t damage your shot which is nice. There’s sufficient room so that you can place a secondary digicam like a bare GoPro if you want.

One minor draw back is the absence of a USB port on the flight controller, requiring a particular dongle to configure Betaflight. Whereas not a deal-breaker, it provides some inconvenience if you must make frequent modifications.

The OasisFly25 body can even accommodate the Walksnail Moonlight Digital camera and an analog setup, including versatility.

The OasisFly25 has a strong building and it could possibly take a beating, however I’d nonetheless advocate getting further props and arms simply in case. I had a number of crashes throughout testing, and the drone held up nicely, with solely minor scratches on the motors and body. The 3D-printed motor protectors additionally did their job, absorbing influence and retaining the motors in fine condition.

Flight Efficiency

Now, let’s discuss the way it flies.

Utilizing the really helpful 4S 720mAh LiHV battery brings the overall weight to 241g, which is barely heavy for a 2.5″ FPV drone. This setup received’t depart room for a unadorned GoPro if you wish to keep underneath 250g, however the drone nonetheless performs extremely nicely.

Proper from the primary takeoff, I used to be impressed by the drone’s energy. Regardless of its small dimension, it presents glorious acceleration and stability, even in very windy situations. It hovers effortlessly at 25% throttle, and with just a bit throttle punch, it shoots up like a rocket. I used to be flying in 23MPH wind, the drone nonetheless felt locked in and steady, with little or no propwash throughout aggressive maneuvers, and it wasn’t overly noisy.

Though the additional weight decreased some effectivity, the drone nonetheless dealt with nicely, providing about 5 minutes of aggressive flying. In the event you’re cruising, you may stretch the flight time to over 7 minutes. The OasisFly25 strikes a great stability between agility and effectivity.

With no propellers in view, you may seize clear footage whether or not you’re flying slowly or quick. The antenna efficiency was glorious, sustaining a powerful sign all through my flights.

That is in all probability top-of-the-line 2.5″ quads with the DJI O3 I’ve flown for freestyle. It has that “flingability” you get from bigger quads like a 5″, seemingly on account of its heavier weight. It’s acquired the punch to throw round simply within the air, and inverted strikes and dives are clear and easy, with out the uncontrollable washout seen in lighter micros. These qualities are key for a great freestyle quad. Whereas it’s not as highly effective as a 5″, it’s nonetheless responsive, punchy, and agile. Importantly, it’s quiet, so it received’t disturb folks close by.

When flying in tighter areas just like the woods, I used to be principally working between the 20% to 30% throttle vary, much like a 5″, however it was a lot simpler to maneuver on account of its lighter weight and nimbleness in comparison with a bigger quad.

I additionally examined smaller batteries, like a 4S 450mAh, however the flight time was virtually halved in comparison with the 720mAh. Whereas the lighter weight did enhance flight efficiency, the decreased flight time didn’t justify the trade-off in my view. I’d advocate sticking with the 4S 720mAh from Sub250 for the very best general efficiency: https://oscarliang.com/product-fmf7

What Might Be Improved

I don’t a lot a lot unfavorable to say concerning the Oasisfly25, fairly completely satisfied about its design and efficiency actually. The one factor is weight.

The body’s sturdiness provides further weight, and whereas this contributes to its sturdiness, I might have most well-liked a lighter construct for higher effectivity and agility. Nonetheless, the trade-off for sturdiness is comprehensible.

You possibly can cut back weight by eradicating the 3D-printed toes or utilizing the Flywoo O3 bare equipment to make the DJI O3 Air Unit 15+ grams lighter. Changing the unique O3 antenna with light-weight dipole antennas can even shave off a number of grams, which is an inexpensive alternative for many customers who received’t be flying lengthy vary with this mannequin.

One other minor suggestion: making the battery lead barely longer would scale back stress on the solder joints.

Lastly, I’d like to see a bit extra safety for the DJI O3 digicam, a small protruded 3D printed piece connected to the entrance of the underside plate would do a great job. For now I believe it’s essential to make use of an ND filter, or only a clear UV filter to guard the lens from scratching: https://oscarliang.com/flywoo-nd-filter-o3/

How you can Setup

The flight controller comes pre-installed with Betaflight 4.4.3 (firmware goal: SUB250REDFOXF722AIO). The ESC comes with BLHeli_32 firmware 32.9.

To arrange this drone for first flight, here’s what I did:

Binding ELRS Receiver

1. The ExpressLRS receiver comes with ELRS 3.3.1 firmware, with the goal Sub250 2400 RX.
2. Energy the receiver (by way of battery or USB) and look forward to it to enter WiFi mode (indicated by a quickly flashing LED).
3. Connect with the ExpressLRS receiver’s WiFi community in your cellphone, open browser and go to 10.0.0.1, and enter your binding phrase.
4. Comply with different binding strategies, see my detailed directions right here: https://oscarliang.com/bind-expresslrs-receivers/.

Binding DJI O3 Air Unit

Betaflight Setup

1. Set your individual charges.
2. Configure switches for arm, angle, beeper, and turtle mode.

That’s it!

Remaining Ideas: Is the Sub250 OasisFly25 Price It?

Completely! The Sub250 OasisFly25 FPV drone presents implausible efficiency in a compact, sturdy design. It’s quick, responsive, and excels at freestyle flying. Though it’s barely heavier than ultimate, the sheer enjoyable and flexibility it gives make up for the added weight.

For $396 with the DJI O3 system, the OasisFly25 is well-priced and excellent for each freshmen and skilled pilots on the lookout for a transportable, sub-250g freestyle drone. You should buy the OasisFly25 from these distributors:

In the event you’re available in the market for a robust and compact freestyle drone, the OasisFly25 is a stable alternative that received’t disappoint.