Brushless motor for 1400 mm double jet boat
03-22-2021, 06:51 AM
#1
Brushless motor for 1400 mm double jet boat
Hi, I'm new at this forum. I'm building a kind of RC rescue boat powered with 2 water jet thrusters with 40mm nozzles.
Now I have two Flycolor 120A ESC powered from 4s Zippy LiPo packs. But currently installed motors X-Team XTI-3665 2650KV get overheat when I try to tow any person.
don't need to reach great speed (it would be nice if it goes up to 40-50 km/h) but i need some motors with higher torque. I didn't see any specs about motors available on the internet sites.
The main problem is that the motor wires becomes very hot and unsolder from connectors :P
Are there any unexpensive (one of this project issues) motors i could use? What should i look for? I cant change battery (only 4 cells) or esc.
Now I have two Flycolor 120A ESC powered from 4s Zippy LiPo packs. But currently installed motors X-Team XTI-3665 2650KV get overheat when I try to tow any person.
don't need to reach great speed (it would be nice if it goes up to 40-50 km/h) but i need some motors with higher torque. I didn't see any specs about motors available on the internet sites.
The main problem is that the motor wires becomes very hot and unsolder from connectors :P
Are there any unexpensive (one of this project issues) motors i could use? What should i look for? I cant change battery (only 4 cells) or esc.
03-22-2021, 08:23 AM
#2
why do you need a recue boat that goes 30mph. My recue boat will do just faster than the 7mph that my local river runs(about 12). Id drop the kv in you motors
03-22-2021, 08:45 AM
#3
Originally Posted by the rc guy
why do you need a recue boat that goes 30mph. My recue boat will do just faster than the 7mph that my local river runs(about 12). Id drop the kv in you motors
.I think about decreasing KV but it usually means higher motor voltage, and i am afraid about torque loose then.
How much KV should it be? 2000 or less?
I noticed that these motors only overheat when towing, without load there is ok.
03-22-2021, 02:09 PM
#4
if they over heat when towing only the drop kv down. 1900 should be a good amount of thrust so you can tow whatever you need,,
03-22-2021, 04:00 PM
#5
Originally Posted by the rc guy
if they over heat when towing only the drop kv down. 1900 should be a good amount of thrust so you can tow whatever you need,,
Maybe some of these :
Surpass Hobby 4074 2000KV with max 30V,
Surpass Hobby 3670 1850KV with max 24V,
They come with original cooling jacket, But could they work with 4s batterypacks?
03-23-2021, 12:51 PM
#6
03-24-2021, 02:40 AM
#7
So this max voltage (here 30V) means I can use 4s instead of 6s battery? Neither sellers or manufacturer don't provide any info about it 
03-25-2021, 03:48 AM
#8
it says 26v..you can use 6 cells...you just have to scroll down a tad 60k max
03-25-2021, 09:14 AM
#9
So it will have 14.4*KV=27360 turns/min? It's enough for me
However when i was buing a motor for plane (some redox) both max and min voltage were mentioned in documentation.
So I'm ordering these 4074 2000KV motors. Very big thanks for help I'gonna put final effects here
However when i was buing a motor for plane (some redox) both max and min voltage were mentioned in documentation.
So I'm ordering these 4074 2000KV motors. Very big thanks for help
I'gonna put final effects here
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