Matt476
Hi Guys, I am planning on building a trolling motor for a rowboat or small boats I'm planning to build but right now I'm trying to pick a proper motor and am not really sure what to use. I would like to have very powerful motors and was even thinking of having pushing and pulling props. They need to be able to run underwater and not to expensive.


I want to build something like this but with metal pipes for strength. 
   The idea is to have pushing and pulling motors.

Do you guys have any ideas?
Thank you, 

Matt
Quote 0 0
csitas
Matt, the things you are looking for don't exsit. You have to remember, all hings are possible on the internet.
Quote 0 0
Matt476
I don't get what's nonexistent? I think It should be quite easy to find and build I just don't know what kind of motor to get. I was thinking one that would be in a hand drill. I don't have a drill to use but id like to find the same type of motor.
Quote 0 0
csitas
My friend, you are right. There are all kinds of motors but, they they don't fit the "cheap" part very well. 
Quote 0 0
solentlife
First - water is very unforgiving medium. Example :

I have a lot of reeds growing and closing of my private boat channel at home. So we took a good powerful Weed Whacker (Strimmer we call them) with gasoline motor. I drove my motorboat while pal of mine put the strimmer over side to cut. As soon as that blade hit water - the load increased tremendously before we even got to cut anything. In fact it slowed so much - we could only cut at waterline.

It will take a lot of power to run props ... 

What size boat ? Estimated weight ? 

By the time you have bought powerful enough motor ... a Hand Drill will NOT be enough if you are talking man carrying boat ... and drive components - it would likely be cheaper to buy a commercial trolling motor. We have them over here for about 150 euros and up .... far more efficient and designed for the job.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
Quote 1 0
DualDesertEagle
If u really wanna build ur own u'll have to go this route, which if u don't have any of the stuff at home and ready to be hacked is probably more expensive than just plain old buying a motor:
Quote 1 0
XDmToter
You might find some useful info here:



Quote 1 0
Matt476
Yea Iv seen thees videos and they seem interesting. I was thinking a row bota but I definitely want them to have some power. I also am planning on building a boat from scratch that will be 6 feet long.  this is the boat  http://rapidwhale.com/mini-boat.php. 
I would much prefer to build my own instead of spending say 150 bucks.
Would the new ft radial motors work? say 2 of them pared up or should I go slightly bigger. I'm also a bit confused with DC and AC will it matter underwater?
Thank you guys for getting back. It's really helpful! (:
Quote 0 0
JEB
Here is a couple of more ideas for you...



Quote 1 0
Matt476
What kind of motors are used in the top video and where could I get them? I can look on banggoods but I don't understand how to find the right sise and one with right tourk and speed.

Thanks,
Matt
Quote 0 0
Wildthing
Matt476 wrote:
What kind of motors are used in the top video and where could I get them? I can look on banggoods but I don't understand how to find the right sise and one with right tourk and speed.

Thanks,
Matt


Try something like the Robot Shop for motor sizing and rpm, but you need a prop and it's specs to make them match no different then the power setups for the planes. 

https://www.robotshop.com/ca/en/gear-motors.html
Quote 1 0
JEB
Matt476 wrote:
What kind of motors are used in the top video and where could I get them? I can look on banggoods but I don't understand how to find the right sise and one with right tourk and speed.

Thanks,
Matt


If you're asking about the top video that I posted, I really don't know where you can get that motor. I looked at the part number on one and it's JBSD9712PM9505W. All I find when I did a Google search was images link to Facebook.

Just taking a guess, it looks like it could be a motor that was removed from some kind of tool.
Quote 1 0
Matt476
what kind of prop should I use?
I also wanted to be able to reverse them to have pulling and pushing. is this hard?
What would be a recommended motor do you think from this website.  https://www.robotshop.com/ca/en/gear-motors.html   I really don't know how to pick them properly.

Thanks for all this help guys!!!!
Quote 0 0
Matt476
What about this motor? https://www.banggood.com/12V-24V-36W-Mini-Wind-Turbine-Generator-Permanent-Magnet-Motor-with-Gear-p-1056323.html?rmmds=detail-left-hotproducts__1&cur_warehouse=USA#jsReviewsWrap Can I use it as a generator and how big is it? this is the problem I have picking motors. I also want to build a water generator and this may work for it but IDK how to understand the numbers. 
Quote 0 0