It's kind of difficult to explain. Basically I want to turn a 15ft camper trailer into a front wheel powered trike. It can be have up to 750 watt motor and top speed of 5 mph across flat sometimes soft dirt.
This is the last setup we used. Side by side bicycle geared as low as possible all human powered and was increasingly difficult and had limited range.
What I have in mind is something more like these.
Except with a fatter wheel.
I'm no engineer so I'm not really sure if this is even possible, but I figure if two humans on bikes can tow it, then one with an electric motor should be able to with the appropriate gear ratio.
I been trying to figure out the best motors and sprockets, with the help of your calculator, to get the most torque, but I'm really new to all this.
Any thoughts or ideas are greatly appreciated.
Also I have a 3000 watt generator on-board already so I could use a AC motor and cut out the need for a DC power supply. I just have no idea where or what to look for when it comes to a motor.
Here are my initial thoughts after looking around for a while.
Using your 48v 750w (Item # MOT-48750) motor with a 11 tooth sprocket (Item # SPR-2511C) to a 89 tooth sprocket (Item # SPR-2589) paired with a another 11 tooth (Item # SPR-2511C) drive sprocket to a 90 tooth sprocket (Item # SPR-2590) on a 9" rim (Item # WHL-9x3.5-4R). Now I'm not positive how the gearing ratio works out because of the paired middle sprockets, but just subtracting 11 teeth from total 179 gives us 168 of total drive teeth to the wheel. This ends up giving us a top speed of 4.92 mph and a gear ratio of 15.27, which seems to be right in my target zone. Does this sound right to anyone? I don't see any torque ratings for the motor so I'm still not sure if this gear ratio would actually generate enough torque to move such a large object, but it seems like it would.
I also wouldn't be opposed to figuring out how to add a pedal crank to the middle sprockets to add some human powered torque to help get it started moving.
Using your 36 Volt 650 Watt Planetary Gear Motor (Item # MOT-36650PL) to a 34 tooth sprocket (Item # SPR-42034) on a 9" rim (Item # WHL-9x3.5-4R). This gives us a top speed of 4.19 mph and a gear ratio of 20.4. This also seems to fit my criteria fairly well. Using a less powerful motor we get a little slower mph than option one, but even a higher gear ratio and remove the middle gearing sprockets of option 1. Still unsure if the high gear ratio would generate enough torque to move such a large vehicle, as there are no torque figures for the motors.
Could even swap option 2 motor with 36 volt 600 watt geared motor (Item # MOT-36600G) for even slower 3.79 mph and higher gear ratio of 22.678.
These options seem to have a correlation between less power and higher gear ratios. I like the idea of not having to create my own middle gear sprockets but it really comes down to what would have the most torque to get the job done. Anyone have any thoughts or feedback?
The terrain is perfectly flat (dried up lake bed), however it can have very soft dirt and be very windy. It sounds like you think that option #2 (Using your 36 Volt 650 Watt Planetary Gear Motor (Item # MOT-36650PL) to a 34 tooth sprocket (Item # SPR-42034) on a 9" rim (Item # WHL-9x3.5-4R). This gives us a top speed of 4.19 mph and a gear ratio of 20.4.) might be best. Do you think this setup would still be able to perform against a strong headwind?
I like the idea of the jackshaft, because of the option of a more powerful motor, and the possibility of adding human powered pedal cranks to the jackshaft. However, I'm only seeing the one 34 tooth #420 sprocket on the site. Is there a smaller #420 sprocket that I can use to get a higher gear ratio from the jackshaft? Or what would you recommend to use for the jackshaft to get a higher gear ratio and transition to a #420 drive chain?
The geared motor option does seem the simplest. I just want to make sure it will be powerful enough for the job.
Please let us know if you have any questions.
You are correct it is for my Burning Man installation the Electric Lazy Lounge. A little background, for years it has bounced between the two regulating entities of BM the "Artery" and the "DMV". Last time we brought it out in 2016 both entities denied it mobility, which is why we biked it. So the goal now is to fit into their electric bike category which is unregulated if it is 3 or less wheels, 750 watts or less, and partially human powered.
So although, I would love to add another motor to help fight the wind that would put us over the 750 watt rule. That's why I'm leaning towards the jackshaft option with pedals. That would allow the larger motor, some human power, and high gear ratios. I'm sure there will be times that the wind will overpower this setup so at those times we will just have to wait it out.
I'm currently putting together a build team to look over what we have discussed here. I will also look into some of the other #420 sprocket sizes and see what kind of gear ratios I can work out.
Thanks for your help.