The FS3115 900KV brushless motors from LN-Motor are meant for 9 and 10 inch cine-lifter FPV drones. These motors can be utilized in X4 and X8 configurations, relying on how a lot payload you anticipate to put in in your drone. Every motor can generate a max thrust of 4kg when geared up with a Genfan 10″ propeller or 3.3kg with an HQProp 9″ blade.
In my earlier FPV motor evaluation, I defined measure and determine motors based mostly on their mannequin quantity. Now, we’ll talk about your construct’s optimum thrust/weight ratio.
Begin together with your drone’s complete weight to find out your motor and propeller mixture’s required energy (thrust). The take-off weight has three important elements:
The drone itself – the body, flight stack, FPV system, motors, and propellers
Flight battery (1-12S LIPO and LI-ION battery as much as 8000mAh) – At all times select the battery with the very best weight/flight time ratio that doesn’t have an effect on flight efficiency.
Further removable gear – CineLifters are geared up with knowledgeable digital camera that always weights greater than the drone (1-2kg)
The unwritten information of FPV drone builds says that the utmost thrust produced by all motors needs to be a minimum of double (2:1 ratio) the plane’s complete weight (together with battery and extra gear). For instance, if in case you have a totally geared up cine-lifter drone weighing 4 kg, the overall thrust generated by all motors needs to be a minimum of 8kg -that’s 2kg thrust produced by every motor for an X4 configuration or 1 kg of an X8 design. In an X4 setup, the LN Motor FS3115 will produce 13-16Kg energy -having further thrust accessible is all the time a bonus. Hovering between 40-50% of the throttle could be optimum. For racing drones, issues are altering; you have to a minimum of a ten:1 thrust-to-weight ratio with a purpose to win the race.
LN-Motor FS3115 evaluation
Disclosure: I acquired these Cinelifter motors in a product evaluation collaboration with LN-Motor. Though the motors had been provided at no cost, all opinions on this article stay mine, and the sponsor didn’t affect me.
LN-MOTOR (Shenzhen Mingshi Innovation Know-how) is an modern expertise enterprise specializing in producing brushless DC motors. “LN” comes from the Chinese language names of the 2 founders, Lin and Na. Since I printed my FS2812 motor evaluation, the corporate modified its brand and slogan (see picture beneath).
The motors are available a cumbersome foam with included mounting screws and M5 nylon insert lock nut. The motors weigh about 106 grams, together with the 25cm 18 AWG leads, and a set of 4 is near half of a kilo, together with 10-inch propellers. It has a 28mm stator width, 12mm stator peak, and 19x19mm M3 mounting sample. Wanting down on the motor, you’ll be able to see that it has a hole shaft that saves some further grams. A slight grip is milled into the highest of the bell to forestall slipping the propeller. All the motor is black apart from some pink stripes on high of the bell.
The FS2812 900KV motors undertake a 12N14P configuration. The quantity earlier than N refers back to the variety of copper coils within the stator, and the quantity earlier than P refers back to the variety of magnets within the bell.
As talked about, the LN-motor FS2812 fits 9 and 10″ long-range and CineLifter FPV drones. You may select from 900KV and 1050KV variations -both assist 3-6s energy techniques.
FS3115 motors: Technical parameters
KV
900KV and 1050KV
N/P
12N14P
Shaft diameter
5mm
Stator diameter
31mm
Stator peak
15mm
Mounting sample
⌀19 M3
Weight
108 grams
Wires
3x250mm 18AWG
Resistance
46Ω
Voltage
3-6S
Max Energy
1566W
Max Present
65A
Effectivity
2.37-4.97 g/W
Max thrust
4135 grams
What sort of ESC do you have to select for the FS3115 900KV motors?
Usually, selecting ESCs with a score of 10-20% higher than the height present your motor attracts at full throttle is really useful. So, if you happen to have a look at the take a look at efficiency desk beneath, the LN-Motor FS3115 geared up with 9″ props reaches 59A on the most throttle and 10″ 65A at 100% throttle; to remain on the secure aspect, selecting an ESC rated at both 70A or 80A could be acceptable. Utilizing a decrease Amper ESC is not going to simply end in an underpowered drone, however, almost definitely, the ESC will fail whenever you give max throttle. You may go for particular person ESC modules or a 4in1 board. I plan to make use of a BLITZ E80 Professional 4-IN-1 ESC that ought to energy these motors bravely.
LN-Motor FS3115 900KV: Take a look at efficiency
Propeller
Throttle
Voltage (V)
Present (A)
Thrust (g)
RPM
Energy (W)
Effectivity (g/w)
HQ 9″
50%
25.2
11
1320
10430
277.20
4.76
60%
25
17.2
1830
12121
430.00
4.26
70%
24.8
26.1
2321
13836
647.28
3.59
80%
24.7
36.7
2865
15313
906.49
3.16
90%
24.5
49.2
3371
16598
1205.40
2.80
100%
24.3
58.6
3369
17376
1423.98
2.37
GF 10″
50%
25.2
11.9
1490
10591
299.88
4.97
60%
24.8
18.9
1987
12171
468.72
4.24
70%
24.5
28.9
2653
13667
708.05
3.75
80%
24.3
39.7
3231
14978
964.71
3.35
90%
24.1
54.7
3856
15803
1318.27
2.93
100%
24.1
65
4135
16235
1566.50
2.64
9 and 10-inch frames for 3115 brushless motors
If you wish to construct an FPV drone utilizing these FS3115 motors, choosing the proper body is essential for efficiency and sturdiness. Many no-name low cost frames are created from low-quality carbon fiber and designed in a storage with out high quality testing. Even when they are often twice as costly, I like to recommend utilizing frames from respected manufacturers akin to iFlight, FlyFish-RC, GepRC, RekonFPV, Diatone, or AxisFlying. The Chimera 9, XL10, Amax F9L+DC9, GEP-Pulsar LR9, MANTA10, and Rekon10 PRO are wonderful decisions for these motors. For the X4 configuration, you will need to determine whether or not you like a true-X body construction or deadcat-style with out props in FPV view.
Should you want X8 builds, the Honeybadger X8, Taurus X8 Professional, FilmMaster X8, and SHENDrones AKIRA 9 are the favourite frames of many CineLifter builders.