No, I’m referring to the plastic one — adding it to the post.
@bigginsking ordered the Flipsky aluminum version, so we will wait for his feedback. By the way, it’s molded, not CNC (IDK what are the implications of it).
Hey, I just posted on the other thread and the flipsky is aluminum for sure, and it machined, not cast.
4 Likes
Thanks for posting this very valuable summary. Could you precise some test conditions for you and your friend like the ESC ?
@Anybody, I’m 85kg like your friend @lishine and hesitating between the 6374 and 6384 models. What would be the pros and cons choosing the bigger 6384 over the 6374 one ? As a start:
Pros: power (+800W) / speed (?)
…
Cons: more expensive (+30usd), less autonomy, …
Thanks for the good words. Where are you foiling, what is your setup?
I use the xcross 160A ESC. He uses some expensive type of vesc. 12s3p. Which other conditions you find not listed?
I see that 6374 is suffice, it felt as strong as the Ali 6384. So I see no point for paying more and bearing more weight.
That doesn’t eliminate the possibility that someone will find one day the advantage of 6384…
1 Like
Still Uncertain About 6374 Motor Performance—No Final Conclusions Yet
Here are the results from my friend’s tests comparing the 6374 motor to the Ali 6384:
-
Vibration Issues with 6374:
- With the original bearings, the 6374 motor produces noticeable vibrations when the prop is half-submerged in water.
- After replacing the bearings with ceramic ones, vibrations were reduced but still present under the same conditions (using a 2-blade prop).
-
Testing the Bearings in Ali 6384:
- The same ceramic bearings were placed in the Ali 6384 motor, paired with a 3-blade prop:
a. No vibrations at all.
b. 2km range increase compared to the 6374 setup.
- The same ceramic bearings were placed in the Ali 6384 motor, paired with a 3-blade prop:
-
Observations:
- Maybe it is normal, but the 6374 motor feels warm to the touch when out of the water, and the 12AWG cable is warm as well. Water temperature during the test was 22°C.
Potential Explanations:
- Differences in 3D-printed parts used in the setups.
- While 3-blade props are typically less efficient than 2-blade props, the results suggest other factors may be at play.
Next Steps:
- I plan to test one or two more 6374 units to confirm if this issue is consistent across multiple motors.
1 Like
hi all just for notice im his friend 
confirm all info
1 Like
I noticed my Flipsky 6374 pulls more power and is less efficient then the Chinese 6384 motor. I also notice that the motor is warm after removing from the water. On 12s I use about 40 amps to get on foil with the chinese 6384 and 58 amps with the flipsky 6374. Same FD propeller used on both units, same weight, same foil, etc. Not a big fan of the flipsky motor other then their waterproofing seems decent (not great).
It is heavier and less efficient.
2 Likes
The original bearings in the Flipsky motor are ceramic. Do you mean he replaced the ceramic ones with SS bearings?
He should just run the motor above the water at full throttle without a prop to see if the bearings are the issue or if the motor is unbalanced.
Yes, the original ceramic created vibrations.
Changed to run ss, ss bearings still created vibrations and then got broke.
When holding the motor by the mount in hand, there are no vibrations.
And there’s also heating, low runtime, and higher current consumption to consider.
We’ve decided to move on from Flipsky and return to the Ali motor, which performs great.
In the future, I’d like to compare the efficiency of Ali and Saite motors.
I tested one on a vesc (friend setup), with their prop and 8s setup, it was very smooth, but I did not pay attention to the surface-piercing behavior. 3 blades are often better than 2 in surface-piercing mode from my experience.
Huge difference, really!
Is motor kV the same and what are the respective stator widths?
From memory the flipsky is 45mm stator, 140 kV and the bduav 6384 is 50mm 120kV. Both these differences will be in favor of the 6384 motor.
1 Like
Then its not the motor. Its either the prop or the motor is desynching under load because the esc is not set up correctly. Ive had a motor desynch under load and feels similar to an unbalanced prop.
We have tried different props. Mainly the same 2 blade prop as we all use here.
His has an expensive esc.
Mine is esc Xcross 160A. If it is desynch, can I do anything about it? It is not vesc…
We both have these problems.
We considered to make more comparison tests of propellers to find out the cause of the issues, but … since we are not the only having these issues… Not worth it to pursue that path
Did you try optimising the blheli settings? There are quite a few that can be played with. Switching frequency, timing, demag, sine…
It’s only USD$40 and aluminum. Just received mine this morning along with the 6384, so keen to try it. Seems silly not to buy it at that price as it’s a perfect fit. Flipsky 4.8 Inches 2-blade Folding Propeller | Motor Boat Propellers | – FLIPSKY
Yes, I’m eager to hear about your experience with the aluminum prop.
I tried the plastic Flipsky prop before they introduced the aluminum version, and it was terrible. Their 6374 motor also performed poorly—it overheated and was inefficient.
Regarding the FD blades, based on the pictures, they seem to have a low pitch. While they are aluminum, the design looks different. FD setups appear to get a lot of motor time, which makes this an interesting puzzle to solve—it’s likely an issue with the motor, the prop, or a combination of both.
It would be really helpful if you could share how much motor time you’re getting with your foil setup under your specific conditions. We’re still missing solid comparative test data, which would be invaluable.
lower pitch = less load on the motor = more RPM / less phase amps
Really hope someone can give us a scan of FD prop, so we can match it in B-series generator 
1 Like
Here is what I think is happening, too much torque requested, bad efficiency, lower rpm :
Efficiency map for illustration purposes only, from another motor
True, if we only had data we could trust from the manufacturers then it would be possible to make a drive efficiency map.
Kinda wish i had two or three friends here in sweden to do it, alone it’s too many hours for me. My best guess for quick progress is to check if the grin ebike simulator has a 6374 in the data.
What KV is the best for ordering custom KV Saite 6374, using with 12s?
1 Like