The OasisFly25 from Sub250 is an thrilling 2.5-inch FPV drone, geared up with the DJI O3 air unit and weighing below 250g, making it good 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 fun of freestyle flying in tight areas or parks. On this evaluation, 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.
The place to Purchase
You should buy the OasisFly25 from these distributors:
The drone is on the market 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 packing 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 digital camera holders (together with one for a unadorned GoPro)
- USB-C adapter for the flight controller
Word that batteries are offered 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 high plate and a couple 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
- Beneficial 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 easy, efficient design means it’s straightforward to take aside when you might want to restore it. The body options replaceable arms, permitting you to swap out damaged arms with no need to switch your complete body. Spare body components can be found on the Sub250 web site.
Weighing 174g with no battery and 241g with a 720mAh 4S pack, the drone is probably slightly heavy for a 2.5″ drone, however the construct may be very sturdy. The DJI O3 system supplies a top-notch video feed, making this an important drone for recording high-quality footage.
The lengthy body physique design means the propellers aren’t seen within the FPV digital camera’s view, so it doesn’t break your shot which is nice. There’s sufficient room so that you can place a secondary digital camera 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 might want to make frequent adjustments.
The OasisFly25 body also can accommodate the Walksnail Moonlight Digital camera and an analog setup, including versatility.
The OasisFly25 has a sturdy development and it might 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 effectively, with solely minor scratches on the motors and body. The 3D-printed motor protectors additionally did their job, absorbing influence and preserving the motors in good condition.
Flight Efficiency
Now, let’s speak about 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 gained’t go away room for a unadorned GoPro if you wish to keep below 250g, however the drone nonetheless performs extremely effectively.
Proper from the primary takeoff, I used to be impressed by the drone’s energy. Regardless of its small dimension, it affords 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 secure, 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 effectively, providing about 5 minutes of aggressive flying. For those who’re cruising, you may stretch the flight time to over 7 minutes. The OasisFly25 strikes 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 robust sign all through my flights.
That is most likely 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″, possible attributable to its heavier weight. It’s obtained 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 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 gained’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, just like a 5″, but it surely was a lot simpler to maneuver attributable to 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 nearly 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 most effective general efficiency: https://oscarliang.com/product-fmf7
What Might Be Improved
I don’t a lot a lot detrimental to say concerning the Oasisfly25, fairly glad 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’d have most well-liked a lighter construct for higher effectivity and agility. Nevertheless, the trade-off for sturdiness is comprehensible.
You may scale 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 also can shave off a number of grams, which is an inexpensive selection for many customers who gained’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 digital camera, a small protruded 3D printed piece hooked up to the entrance of the underside plate would do 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/
The best way to 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
- The ExpressLRS receiver comes with ELRS 3.3.1 firmware, with the goal Sub250 2400 RX.
- Energy the receiver (through battery or USB) and look forward to it to enter WiFi mode (indicated by a quickly flashing LED).
- Connect with the ExpressLRS receiver’s WiFi community in your telephone, open browser and go to 10.0.0.1, and enter your binding phrase.
- Comply with different binding strategies, see my detailed directions right here: https://oscarliang.com/bind-expresslrs-receivers/.
Binding DJI O3 Air Unit
Betaflight Setup
- Set your personal charges.
- Configure switches for arm, angle, beeper, and turtle mode.
That’s it!
Remaining Ideas: Is the Sub250 OasisFly25 Value It?
Completely! The Sub250 OasisFly25 FPV drone affords improbable 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 supplies make up for the added weight.
For $396 with the DJI O3 system, the OasisFly25 is well-priced and ideal for each novices and skilled pilots on the lookout for a transportable, sub-250g freestyle drone. You should buy the OasisFly25 from these distributors:
For those who’re available in the market for a robust and compact freestyle drone, the OasisFly25 is a stable selection that gained’t disappoint.
