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Motors - looking for best link to answer a very large topic

*disclaimer; I’m amazingly terrible at understanding engineering, science or math. But if explained to like a toddler, I usually have no problem grasping the overall meaning of what I need to know in order to solve problem.
I am trying to put together my own lure coursing machine. There is only one way I’ve found to do so without buying one for 1-2k. Which is to use a hangar 9 auto start 12volt Hd power supply ( it’s what’s used in the RC hobby community to jumpstart their airplane propellers prior to take off I guess) and power it with a;12volt lead battery.
The auto start motor ran for 15 min and of course the brushes failed because they’re just not meant for the application I’m trying to use it for. Not to mention when I was running it i was beyond disappointed with the speed.
So, i set upon trying to find an affordable motor that could be applicable to my project. And then I learned there’s a whole bunch of friggin motors, and a few days of internet researching was not going to narrow down my search terms.
Can anyone help me by suggesting the proper category of motor or a good link where i could learn specifically what I need to know without hours of reading regarding every single kind of motor.
The closest I’ve come is winch motor 2,5 horsepower. Because they are geared, which provides the high speed high torque and less wear and tear an auto start motor would induce if I chose to go that route.
AND PLEASE GUYS IM NOT LOOKING FOR THE ANSWER, from what I’ve read on most forums, it’s offensive for just anyone to come barging in and demanding schematics and specifications for free from members who are just trying to chat within their community.
I JUST NEED HELP POINTING ME IN THE RIGHT DIRECTION TO LEARN WHAT I NEED TO TO PICK THE MOTOR, SOLIENOID, RELAY SWITCH (I have no idea what those last two are I just know their in some of the machines with certain motors and not in others so..)

Am I at least close with thinking winch motor? I want the line to run a continuous 500 loop course at a speed of 39-50mph. The line they typically use is a kite string from dakrone similar to kite string, not sure if all the lines are weighted with a small 2lb weight but I have seen that as well. Motor shaft is mounted to a large 5-7inch wheel that feeds string out. Pulleys are set in design and hammered into the grass, the line runs along those pulleys giving it the right amount of tension to run the loop at said speed. (Oh yeah and there’s a bag or a fox tail usually attached that obviously teases the dog and mimicking prey and he chases it around.) I basically want a more powerful version of the lame ass SWIFTPAWS sells at a fraction of the price. Mostly because I know it can be done, the machine itself does not involve many components if I go the motor route and not the Chinese chip version.
 
When I started reading the above I assumed you were a fisherman as they use lures. I'm guessing now that's not what you're looking for. Do you have a video you can link as I'm still not 100% sure of what you are trying to do.

Googleing "Swiftpaw" got me closer but they don't have a video, However their units don't look big enough (although the scale could be misleading) to hold a 2.5HP motor.

Mike.
 
Are you talking about an endless loop lure for dog racing?

I am involved in large model sailplanes (up to 4 meter). We use a winch to get them to altitude and the old Ford long-shaft starter motor was a goto for that application. A 6V motor running at 12V was preferred. Sometimes a speed-limiting winding had to be removed to get the speed we needed. That source is still available, but when I built my most recent winch (about 25 years ago), I turned to a 12V lure motor that I believe was made in India by Injoy. It is nearly identical to the Ford starter/

Have you checked Injoy? I quickly checked and see them for about $100 USD, which is about what I paid then. Here are two winches I made. The yellow is a Ford and relied on an electronic brake to prevent backlash. It was modified to have ball bearings front and rear. The black is an Injoy with a classical brake that depended on line tension. The problem you will have is continuous operation. If you really need that, I don't think either motor is appropriate at the power level you are suggesting. A minute or two might be OK.

1730287304906.png
 
A winch is normally geared down so the drum runs at low speed with high torque. The motor itself may? be adaptable.

Are you sure of the speeds?
50MPH is roughly around 75 feet per second, or 25m per second. A 6 - 7" pulley would be moving roughly 18" or 500mm per revolution, so need ~50 rotations per second for 50MPH.

That's 3,000 RPM!
You mention a 2lb weight, so as a ballpark guess allow twice that as the minimum "pull" capability; 4lb.
4lb on a 3" radius wheel would be one ft-lb torque.

In ballpark figures, that works out to about 2/3hp or 500W to maintain speed.
It will take several times that to accelerate everything up to speed in a relatively short time.

The winch motor (not complete winch) does sound like a possibility - but be aware a 2.5HP motor working on a 12V supply will need something like 200A when running at full power - and rather more than that while getting up to speed! Once at full speed with the above calculated load, it would likely take 40 - 50A.
 
Your calculations match experience. We launched sailplanes well in excess of 5# almost vertically to over 400 ft. International competition has a 200A limit for the winch. We probably exceeded that during the start of the launch. Those large welding cables visibly jerk. Although sailplane and dog racing may seem unrelated, the launch system, except for the continuous loop in some dog setups is similar.* The main market for the Injoy motor is dog racing, I believe.

For the TS, for disconnect, I used a heavy duty battery switch for trucks. I can look up exactly what if there is interest. For solenoids, I only used a single automotive type. Some systems have two in series for safety. I did not see the need for that. For dog racing, I might reconsider. Another add-on when using dual solenoids is an LED across each set of contacts. When open, the LED is on, thus, if one of the solenoids fails closed, it will be easily detected. The winch on the left (yellow) had variable speed for which I used 5 mosfets in parallel. It's a very old design, but I have no problem sharing any of it.

* I actually considered a continuous loop but settled on making an automated retriever for the line instead. It's reasonably fast and does not add twist to the line as simpler, non-automated systems do. It's like a giant spinning reel used for fishing.

BTW: Is there a way to correct the page to a more easily readable width. This is what I see:

1730357087190.png
 
Last edited:
BTW: Is there a way to correct the page to a more easily readable width. This is what I see:
What are you viewing it on?
This forum software keeps the side borders and reduces the text width down to stupidly narrow, as the browser window width reduces. Going a bit narrower still, it changes format to headers on posts and no side borders.

Changing the view size, text size or zoom level to reduce the amount on screen may trigger the switch to remove the borders?
 
That cured it. Such a simple way to get rid of advertising seems counterproductive. Nothing like a narrow-minded forum.

Chrome is my browser and the monitor is a very old Viewsonic 213T. It's aspect ratio is wider than higher. If I narrow the window to something like an 8-/1/2x11, the lists are again readable.
John
 
Try Brave (it's the old open source chromium) as that automatically removes any advertising.
It appears to remove the borders as soon as it's not full screen.

Mike.
 

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