Good video. Never thought of the issue of having the rotor contact the stator. I have run in to an other issue though. After several years of use, and many trips under water finally the coating on the rotor gave way, and the rotor started to rust. That caused the rotor to seize, as the rust expanded. One week it was running fine, but the next time I was going to run it, the axle would only do 1/4 rotation because the rust had built up a big "blister" on the surface.
Thank you for your comment! That is a great point, something that I have never encountered. It seems like in your case the blister on the rotor was contacting the stator and seizing the motor.
I have a MiToot 5010 360kv on which I installed full ceramic bearings. It seems to work fine underwater. It also claims high temperature resistance. I wonder how much current I could pass through it, given the excellent cooling of the wire.
Inrunner motors. Outrunners are totally open to the elements. Back in the 80s when racing,(Winning) 10th scale off-road we had little plastic coned bearing holders that you could put a bearing in and spray cleaner through cleaning them.
I want to try running a motor under a canoe fully submerged in salt water, with full ceramic bearings. It would be silent, require no gearing, and have amazing cooling. Will it work?
Hey there, just discovered your TH-cam channel, awesome videos! Just a question, how do you seal the hole that connects the motor to the prop, if the motor is inside the boat and the prop is outside? Is there like a water seal that is low friction? I have tried looking for the answer to this for a while but can't seem to find it. (I don't have a boat but want to make my own😁)
Hi Pira Tec. Thank You for the comment! On a boat, the prop shaft is connected to a flex cable. The flex cable typically resides in a teflon liner which is inside a brass stuffing tube. This combination usually provides a very good water seal when the flex cable is greased. If there are any issues, heat shrink tube can be placed on the motor side of the flex cable over the stuffing tube to seal off against water leakage.
I noticed that you are a tunnel boat guy, any recommendation for best racing performance motor esc and battery for for the 3.5 tunnel class? Thanks in advance.
Here is a setup for 4s. A 4s battery 65C 5000mAh. 40x75-85mm motor between 1800-2200kv. 120A ESC rated for 4s LiPo. Start with a 40mm prop and work your way up monitoring heat.
Avrgly how long does the motor will work under water... i dont want the answer as ( it depends ) tell me the avg answer.. is goint to last over 1 year or less or more...?????????
I don't land my fixed wings on the ocean, however, it's rare that the motor ever gets a drop of water on it when landing in a lake. Are you finding the motor gets splashed on from the takeoffs and landings? How large is the wingspan?
RCexplained our drones have a wingspan of 2m and are designed to land on the water as that’s where my research is (Twitter @explorer_mel). These units are in the development phase and it’s impossible for the motor to not hit the water out in the ocean. It’s a toss up between accepting they are disposable or finding a genuine waterproofing solution....!
Hey Mel, its awesome to hear your team is using RC Aircraft for your research. I tried to look on your twitter for detailed images to really get an idea on the design, however I could only find one image. When the plane is sitting in the water where is the water level relative to the motor? How high is the tip of a propeller blade above the water level when the propeller blade is positioned straight down?
@@RCexplained Hia. The prop spins in the water if the motor were to be on. The drone lands on the water with an angle of decent of 10 degrees or lower (nice and smooth) but this is the middle of the ocean and there are waves and swell- everything gets sploshed- you can't escape it. I need to find a solution of protecting the motor or just treating them as disposable...! We flush them with fresh water immediately after each flight but as we work in the tropics with high humidity, are struggling to keep the 'alive' for more than 8-10 flights.
Hey Mel, would a motor shroud help deflect water away from the motor? If you can't stop water from hitting the motor at all, the only thing you would be able to do is swap out the bearing for special heavy duty sealed bearings. This still does not remove some of the concern for the water hitting the stator and rotor of the motor. I would expect over time that there would be motor failure in these area.
Just because the vehicle is submerged doesn’t mean the motor is exposed to water. It’s highly likely that the electronics of the ROV are in a sealed chamber. Having said that, I can’t speak for all manufacturers so take my 2 cents with a grain of salt.
@@MrPhilbautista Yeah, the motor phase are waterproof. I was more asking about bearing & co since the motor is totally underwater. With the pressure, the water go everywhere. That's why. They suggest to make the motor running in freshwater after going in salt water. There is motor who are watertight at deep depth, that's why i ask. The subject is never really approach on the web, so ...
i made a 100% waterproof car just by using a 3D printer. i just 3D printed an enclosed case for the motor, esc, reciever, everything. sealed it with double layered silicon aswell. sure, taking it apart now is a pain in the ass, but hey, it is possible
@@RCexplained yeah, it was worth the 50 hrs of modelling :D EDIT: oh, and yeah, it is not 100% waterproof as i said, it still has some minor leaks if it is compeltely submerged in water for too long. the fact that it is fully enclosed, nearly air tight, makes for cooling problems. iam thinking about improving the design about putting some plumming in as water cooling, the car heat protection kicks off real fast. and btw the car iam talking about the whole time is actually a cheapo, feiyue FY08. the chassis has a kinda weird shape so it was hard to design a fully waterproof casing. worth it tho!
@@littleraptor9898 Right On, it's fun to experiment to solve a problem. If you are looking in to water cooling, there's options out there for RC boats.
Good video. Never thought of the issue of having the rotor contact the stator. I have run in to an other issue though. After several years of use, and many trips under water finally the coating on the rotor gave way, and the rotor started to rust. That caused the rotor to seize, as the rust expanded. One week it was running fine, but the next time I was going to run it, the axle would only do 1/4 rotation because the rust had built up a big "blister" on the surface.
Thank you for your comment! That is a great point, something that I have never encountered. It seems like in your case the blister on the rotor was contacting the stator and seizing the motor.
I have a MiToot 5010 360kv on which I installed full ceramic bearings. It seems to work fine underwater. It also claims high temperature resistance. I wonder how much current I could pass through it, given the excellent cooling of the wire.
Inrunner motors.
Outrunners are totally open to the elements.
Back in the 80s when racing,(Winning) 10th scale off-road we had little plastic coned bearing holders that you could put a bearing in and spray cleaner through cleaning them.
I've been getting rubber sealed bearings off Ali express for my big fishing drone ..602 bearings ..works great I keep using the same seller ..
I want to try running a motor under a canoe fully submerged in salt water, with full ceramic bearings. It would be silent, require no gearing, and have amazing cooling. Will it work?
Great info. Just got a slingshot sensored brushless. So great tips for the newb
Great video, in fact all your videos are spot on and very helpful in understanding.
Thanks, this was really helpful for me!
Glad it helped!
Hey there, just discovered your TH-cam channel, awesome videos! Just a question, how do you seal the hole that connects the motor to the prop, if the motor is inside the boat and the prop is outside? Is there like a water seal that is low friction? I have tried looking for the answer to this for a while but can't seem to find it. (I don't have a boat but want to make my own😁)
Hi Pira Tec. Thank You for the comment! On a boat, the prop shaft is connected to a flex cable. The flex cable typically resides in a teflon liner which is inside a brass stuffing tube. This combination usually provides a very good water seal when the flex cable is greased. If there are any issues, heat shrink tube can be placed on the motor side of the flex cable over the stuffing tube to seal off against water leakage.
Really helpful, thanks for uploading.
Just discovered ya. Good stuff here👍
You need magnetic bearings or rotating hydro seal
How do they build a trolling type of motor then?
Is it safe to operate brushless motors submerged in mechanical lubricant?
I noticed that you are a tunnel boat guy, any recommendation for best racing performance motor esc and battery for for the 3.5 tunnel class? Thanks in advance.
Here is a setup for 4s. A 4s battery 65C 5000mAh. 40x75-85mm motor between 1800-2200kv. 120A ESC rated for 4s LiPo. Start with a 40mm prop and work your way up monitoring heat.
@@RCexplained great Ryan, I will consider this, I really like the way you explain it, thanks.
Has anybody tried dipping a brushless motor in CorrosionX before use?
I have not. I wonder if it would help.
Great video
Thanks!
Avrgly how long does the motor will work under water... i dont want the answer as ( it depends ) tell me the avg answer.. is goint to last over 1 year or less or more...?????????
Maybe a year at 30seconds per day if you were at high RPM with non shielded bearings running in less than perfect (polluted) water.
Thanks for this!
Are they atleast water resistant if you flew a drone in the rain?
yes, they are. However overall lifespan could be reduced if water gets to the bearings.
I make/use fixed wings that land on the ocean .... RIP motors after around 8 flights.... trying to find a solution
I don't land my fixed wings on the ocean, however, it's rare that the motor ever gets a drop of water on it when landing in a lake. Are you finding the motor gets splashed on from the takeoffs and landings? How large is the wingspan?
RCexplained our drones have a wingspan of 2m and are designed to land on the water as that’s where my research is (Twitter @explorer_mel). These units are in the development phase and it’s impossible for the motor to not hit the water out in the ocean. It’s a toss up between accepting they are disposable or finding a genuine waterproofing solution....!
Hey Mel, its awesome to hear your team is using RC Aircraft for your research. I tried to look on your twitter for detailed images to really get an idea on the design, however I could only find one image. When the plane is sitting in the water where is the water level relative to the motor? How high is the tip of a propeller blade above the water level when the propeller blade is positioned straight down?
@@RCexplained Hia. The prop spins in the water if the motor were to be on. The drone lands on the water with an angle of decent of 10 degrees or lower (nice and smooth) but this is the middle of the ocean and there are waves and swell- everything gets sploshed- you can't escape it. I need to find a solution of protecting the motor or just treating them as disposable...! We flush them with fresh water immediately after each flight but as we work in the tropics with high humidity, are struggling to keep the 'alive' for more than 8-10 flights.
Hey Mel, would a motor shroud help deflect water away from the motor?
If you can't stop water from hitting the motor at all, the only thing you would be able to do is swap out the bearing for special heavy duty sealed bearings. This still does not remove some of the concern for the water hitting the stator and rotor of the motor. I would expect over time that there would be motor failure in these area.
Ok, but how to do with Diving ROV ? Because the motor are submerged.
Just because the vehicle is submerged doesn’t mean the motor is exposed to water. It’s highly likely that the electronics of the ROV are in a sealed chamber. Having said that, I can’t speak for all manufacturers so take my 2 cents with a grain of salt.
@@MrPhilbautista Yeah, the motor phase are waterproof. I was more asking about bearing & co since the motor is totally underwater. With the pressure, the water go everywhere. That's why.
They suggest to make the motor running in freshwater after going in salt water.
There is motor who are watertight at deep depth, that's why i ask. The subject is never really approach on the web, so ...
i made a 100% waterproof car just by using a 3D printer. i just 3D printed an enclosed case for the motor, esc, reciever, everything. sealed it with double layered silicon aswell. sure, taking it apart now is a pain in the ass, but hey, it is possible
Hey Little Raptor. That sounds great! Sound like you made a true waterproof enclosure for all components!
@@RCexplained yeah, it was worth the 50 hrs of modelling :D
EDIT: oh, and yeah, it is not 100% waterproof as i said, it still has some minor leaks if it is compeltely submerged in water for too long. the fact that it is fully enclosed, nearly air tight, makes for cooling problems. iam thinking about improving the design about putting some plumming in as water cooling, the car heat protection kicks off real fast. and btw the car iam talking about the whole time is actually a cheapo, feiyue FY08. the chassis has a kinda weird shape so it was hard to design a fully waterproof casing. worth it tho!
@@littleraptor9898 Right On, it's fun to experiment to solve a problem. If you are looking in to water cooling, there's options out there for RC boats.
There is no such thin as waterproof. radio control. PCV, jahasss