The new Lumenier JB2407-11 1750Kv Bardwell motor is a partnership in development between both Lumenier, known for their high quality, efficient motors and Joshua “Know it All” Bardwell. One would be safe in assuming that these motors have a high attention to detail, but what makes these motors stand out among the very large crowd of motors available today?
Lumenier JB2407-11 1750KV Specs
- Kv: 1750
- Configuration: 12N14P
- Windings: 9 turn DLRK
- Termination: D (Delta)
- Stator Diameter: 24mm
- Inner Shaft Diameter: 4mm / Steel
- Base Mounting Pattern: 16x16mm M3 Thread
- Motor Dimension: 29.5×19.5mm
- Weight: 35g (short wires)
- Idle Current @12.6v (Io): 1.2 A
- Cells (LiPo): 3-6S
- Continuous Current Max (A) 60s: 35A
- Burst Current Max <10s: 45A
- Continuous Power Max (W) 60s: 560W
- Internal Resistance (Rm): 180mΩ
- Motor Wire Length: 150mm / 20AWG
- Motor Connection: Bare Wire
- Minimal base design for reduced weight
- Single piece 4mm steel shaft with a screw termination in the base for easy maintenance
- Awesome yellow and purple color scheme. Joshua’s favorite colors!
- Long 150mm motor wires for ultra clean setups with 4in1 ESCs
- N52SH Curved magnets for maximum performance and heat resistance
These motors are sure to make an impression when you first lay eyes on them. To be honest, my first thought when I broke out these motors from the packaging: “Boy, those are some shiny, gaudy looking motors!” They have an anodized yellow and purple color scheme that are sure to draw attention on almost any multirotor. The motor is large, at a 2407 (24mm diameter, 7mm height) stator size, which adds to the aesthetic domination of your aircraft. But it’s not just about looks…
The Lumenier JB2407-11 holds many staples of a well designed premium motor. The bell is an open bottom design which allows more airflow to pass through the motor to keep it cool, light, and debris free. It is big, with a 2407 stator along with multi-strand wingdings. This size, in combination with the heat resistant N25SH arc magnets hold a promise of good torque and durability. This is further enhanced by the 1.3mm thick bell ring and the extremely tight air gap, holding every bit of magnetic efficiency in place.
The hollow shaft further lightens the motor, and the pyramid stippling on the top ensures the the prop is slip free once the nut is in place. A screw in the bottom of the motor holds the bell in place, and while hit and miss on some motors, the set that I received didn’t seem to have differences in how freely the bell spins.
Flight Performance of the Lumenier JB2407-11 1750Kv Bardwell Motor
Throughout my time in FPV, I have never used motors under 2000Kv on a quadcopter, so either way, I knew this was going to be a learning experience. Before these motors had been shipped to me, I had received an email from GetFPV about the release of these motors, with a short excerpt from Joshua Bardwell:
“Freestyle pilots want the smoothest possible flight. They usually have to give up power to get it. Not any more. The 2407 stator on this motor gives massive torque and responsiveness, even to aggressive props. The result: smooth, propwash-free flight and ridiculous punch outs and speed, all at the same time. These motors are best paired with higher-pitch 5” props such as 5×4.8 or 5050 size. On “typical” freestyle props such as 5×4 or 5×4.3, they would be under-propped and not make up for their additional weight in thrust.”
It’s understandable that a motor with a lower Kv would require some higher pitch props. With the size of the stator, they can definitely handle it. But deciding not to take JB’s word for it, I assembled a sampling of propellers together that would put the Lumenier JB2407-11 through it’s paces.
My long-time go-to propeller has been the DAL Cyclone 5046 but I knew here that they might be middling at best. However, I decided to include them in my test flights, as well as some with both lower and higher pitch. Here’s what I tried the Lumenier JB2407-11 motors with:
- HQ Prop (Glass Fiber) – 5 x 4 x 3
- T-Motor Ultralight – 5.1 x 4.3 x 3
- DAL Cyclone – 5 x 4.6 x 3
- Gemfan Hurricane – 5.1 x 4.99 x 3
- Lumenier Buttercutter – 5 x 5 x 3
- Lumenier Gatebreaker – 5 x 5.3 x 3
For those that need a little help understanding propeller stats, keep the following in mind:
- The first number is the swing size of the propeller across the diameter. This is measured in inches.
- The second number is the pitch of the propeller, also measured in inches. This measured by how far the propeller would move per one revolution through a soft medium. Think about it this way: If you were to spin your propeller in a solid gel, this is how far it would move in one rotation.
- This is the number of blades on the propeller. In this case, all were tri-blades.
For a deeper understanding of propellers, check out this article: All About Multirotor Drone FPV Propellers
First off, while flying with the Lumenier JB2407-11 1750Kv motors, I eventually noticed that at lower speeds, no matter the propeller, I was having some issues with oscillation at lower throttle levels. It wasn’t clearly evident in my FPV feed, but once I reviewed GoPro footage, there it was. It’s definitely something that can be tuned for, but make sure to check for it. This is by no means the motor’s fault, but more so a factor of the weight of the multirotor (650g) that I had put them on, fighting with gravity on lower speeds.
I did not make any adjustments to the tune of the multirotor between propeller changes. I wanted to see just how each different set of propellers behaved under the same situation. Also, all tests were performed with 4s batteries, however they are rated for up to 6s, and would definitely enhance everything under a higher voltage battery.
I will say the Joshua Bardwell was right about the pitch of the propellers used, which honestly, was to be expected. However, there is a revelation about proper pitch selection that I have personally come to in regards to lower Kv motors, and perhaps to this motor specifically. That is this: pick a propeller pitch that reflects how you enjoy flying!
Low Pitch Propellers
While the lower pitch props, such as the HQ Glass Fiber and the T-Motor Ultralights required more throttle to keep the aircraft flying, they resulted in smooth movements, creating more flow in the flight. These props are slow in the corners, and often feel like the aircraft is drifting. While slightly difficult to manage at first, I developed a knack for planning how I would take the corners with this in mind.
Top end throttle is, of course, limited, however there is still enough headroom to perform power loops, emergency maneuvers to avoid obstacles, and has enough speed to keep up with a friends 6″ multirotor in chases. However, when performing a dive, it’s hard to recover close to the ground, as I often had to start throttling up much higher than I usually do.
The DAL Cyclones add some punch to the flights, however the multirotor still feels slightly under-propped. There is a definite addition to top speed and maneuverability, however there was still some looseness in cornering. Dives are easier to recover from a little closer to the ground.
High Pitch Propellers
This is where the Lumenier JB2407-11 motors really come into their optimum operational zone. While the Gemfan Hurricanes and the Lumenier Buttercutters gave almost the same exact performance, the Lumenier Gatebreakers just enhanced that. Cornering ability tightens up significantly, a punch-out feels powerful, and top speed is fairly quick, but manageable. It was significantly easier to recover from dive maneuvers.
Overall, I am quite pleased with the Lumenier JB2407-11 Bardwell motors. While initially a little bit over the top in color scheme, once mounted, they looked great. The design elements behind these motors make them a great choice for freestyle pilots, especially if you’re looking to experiment with your flying style and different propellers. They handled the Arizona desert with style, even after getting a bit of grit in them.
To me, the best part of these motors is their low Kv and high torque. Despite flying with quite a few differently pitched propellers, all my flight times were longer than what they normally are with higher Kv motors, often averaging four to five minutes per flight. Partner these with the lower pitch props for significant increases in flight times for mid to long range flow flying, or with high pitch props for responsive mid to short range proximity flights.
Again, keep in mind that all my tests were performed with 4s batteries. Using a higher voltage battery will definitely impact how these motors perform, even with lower pitch propellers.
While they performed well on a heavier multirotor, I’m going to try these out on a lighter frame with 6″ props. I have no doubt that they will perform just a good, if not better.