I just tested the scooter with one battery and I am more then happy with the speed! I hit 30km/h (18-19Mph) which is perfect!

I have a nice video and great data. I am writing a post about it.

www.youtube.com/watch?v=0wTfQiGFAKE

www.youtube.com/watch?v=t7uvv7EYqg0

www.youtube.com/watch?v=wBgt0wj3Hzk

Here are the specs of the prototype
Range Up to 30 miles
Max Speed 25 mph
Recharge Time LiFePo4 1 ½ hours
Tire Diameter 25”
Weight of Bike 125 lbs.
Footprint 16” x 34”
Max Hill Incline 30%
Max Rider Weight 250lbs
Turning Radius Zero to 3 ft.
Estimated Retail Cost $3,500

You can find more informations on there website
http://rynomotors.wordpress.com

This looks like the Bombardier Embrio concept. The Embrio has smaller front wheel that acts like a stability control when the Embrio is stopped or traveling below 12mph.

Or the Canadian Benjamin Poss Gulak, with his one unicycle with two wheels.

Here is the new U2 version. It is a hybrid between a motorcycle and what you see there. I opens like scissors and unfolds into a motorcycle. (Not really like scissors, more of a  linear motion)

I just notice that Ben has a blog! http://bpgulak.com/

He his working on this neat track scooter call DTV.

www.youtube.com/watch?v=hh2nLWYnxkM

www.youtube.com/watch?v=7s0guJrle_8

Thanks to Hung Chang for is cool blog wackyboards where I learn about Ryno motors. http://wackyboards.blogspot.com/2010/08/ryno.html

PS- It is RYNO motors and not Rhino like the url

I have a tonne of video to upload because I have been using the scooter a lot!! I have a couple of miles on it. I broke the belt a couple of time and I am right now waiting for a new belt, got 2 this time.
I am also working on a belt tensionner, I realise it is important (but to lazy to build one) since the belt slips a lot due to high torque when starting the scooter.

I bought these new Turnigy Nano-Tech battery from hobby king.

Here are some of the highlight

• Fast charge capable, up to 15C on some batteries.
  Longer Cycle Life, almost double that of standard lipoly technology.
• Internal impedance can reach as low as 1.2mΩ compared to that of 3mΩ of a standard Lipoly.
• Less Voltage sag during high rate discharge, giving more power under load.

Since V = RI, and we have a 3mΩ resistance per cell  in my standard battery and consume 80Amp at peak.

When you have 14,8V, that is 4 time 3,7V cell. Since they are in series, we should then have a 3mΩ * 4 = 12mΩ for a pack.

V = 0.012A * 80
V = 0,960V of drop out. (960mV)

With the 1.2mOhm
V = 0.0048A * 80
V = 0,384V of drop out.   (384mV)

There is a difference of 576mV. 40% difference.

That is theoretical, how does it stand up in real life?
Here are the measurement I got from live test.

82.51A Peak Amp
Nominal Voltage 16.52V and the minimum voltage sag was 15.58V

16.52V-15.58V = 0.940V
0.940V/82.51A = 11.393mΩ

77.83A Peak Amp
Nominal Voltage 15.65V and the minimum voltage sag was 14.71V

15.65V-14.71V = 0.940V
0.940V/77.83A = 12.078mΩ

81.04A Peak Amp
Nominal Voltage 16.67V and the minimum voltage sag was 15.37V

16.67V-15.37V = 1.3V
1.3V/81.04A= 16.041mΩ

72.85A Peak Amp
Nominal Voltage 15.23V and the minimum voltage sag was 13.95V

15.23V-13.95V = 1.28V
1.28V/72.85A = 17.57mΩ

70.03A Peak Amp
Nominal Voltage 15.98V and the minimum voltage sag was 14.88V

15.98V-14.88V = 1.1V
1.1V/70.03A = 15.708mΩ

I realise after looking at those results that in some test I have the initial voltage and some the “after the ride” voltage. That make my result not consistent and semi false.

There is difference between the voltage read at the beginning of the test and the one at the end. In my notes I had some results where I am not sure it that is the voltage are at the beginning or the end of the ride.
I will be careful during my next test.

There is many test to be done again with the new batteries. Can’t wait to see if I spend to much money on those batteries!

Here are the hall effect sensor. There is 3 sensors.

Here you can see the slot inside the shaft where the wires can travel.

There was also this neat battery. 48V 10.5Ah lithium battery. It weight 3.4Kg (7.5Lbs)

That could fit in my scooter. The only draw back of those specific battery is the continuous current discharge. It is very low. I think it is 2C so 20Ah… the motor consume about 4Ah with no load and I get surge current of 70Ah.

Here is the work on the new revision of the original scooter. The original scooter is very small in length (29 inch). To select the new size of the new scooter, it was really easy. I just place my feet on the ground at a distance that I felt good and stable. Like on a snowboard.  So I added around 11 inch for a total of 40 inch (wheel to wheel).

Here is how I did.

This is the frame I found at St-Eustache flea market, one of the biggest in Québec.  I paid 10$ for it. Just the frame no motor, no battery. They are in very good condition and normally, when found online, they cost 18$ for the front wheel and 20$ for the back one. So 10$ was a good deal.

I have to go again to that flea market this summer! I will bring my dad, he loves flee market just like me!

Saw the entire frame in 2.

I also made 2 of  those plate you see in the picture so I can give tension on the belt with the left end screw. When I turn the bolt, the washer (big circle)  is move to the left, it pulls the axle of the back wheel.

To have a longer frame, I will use aluminium  L bracket. To mount them to my scooter, I drilled hole in the frame.

Here I cut the L bracket.

I also added other metal bracket to hold all the electronics in the middle of the frame.

Here is the progress. It feels stables when I get on it.

The new 11 inch makes a huge difference!

After I installed the motor, I saw this. Look closely, the outher shell (black) is touching the gold piece. There is suppose to be a gap between them.

I machined this like spacer.

Without the spacer.

With the spacer. See the difference?

Chain tensioner

I wonder the time it takes to get that sprocket spinning perfectly straight.

Those are LiFePO4 lithium battery. They are very big.  They have a nominal capacity of 14Ah and a continuous discharge rate of 10C ( 140Ah) which is not a lot.

Yep, those are big! Will not fit in my scooter! They are too wide for my scooter.

Model number is F014 and it is manucfactured by EIGbattery.

The maximum discharge rate of those battery is very low, 10C. Normal RC lithium battery are now in the 30 to 40C. That is 40 time the nominal capacity, so when you have 5Ah that is 40*5=120Ah continuous discharge!

If I choose the EIG battery, I would use the C008 , C015 or F010. The other models are very long (20cm) and large (15cm).

I was able to reach 40,3km/h!! That is 25Mph!! It was scary on my bad street road. When I came back of that ride, I also fell down at 34km/h, I pooped a wheelie and fell!! haha

2391W!

Here are other shoot of the moment one of the 3rd wire of the motor got unplug. Here is the peak of current.

3270W

That is 143AMP! That is alot of current! That did not help, the wires got hot and melted a little bit.

First I had to draw everything on the computer, I printed it to be sure I had the perfect fit. This is the new scooter. Since my bracket is bigger I had to drill new holes in the frame. I took the piece of paper on glued on the frame.

I wanted to be aligned so I turn on my LED flash light.

Here are the new holes.

I did the same thing here, I glued down the drawing and punch out the holes.

Those are the bottom and top of the bracket.

The only concern I have is that I am wondering if I am loosing the natual air flow of the motor by putting the motor bracket right in front of the motor vent holes. I was thinking of drilling holes but need to be sure I will not make my new bracket fragile on the edge.

On the right side of the spacer you can see washers, there are 3 washers, they help me to adjust the depth of the motor so I can aligned the belt.

I am thinking of adding this fan to cool down the motor. I bought this 7 blades turbine fan on hobbyking. It is a little bit big put should do the job. I will need to machine a bracket to hold it to the motor.

I might try other solution like a 5V PC fan.

Today I tested the motor and it works! I test the 30$ motor and at high speed, it was making this very high pitch sound. I will probably need to adjust timing and frequency directly on the brushless controller.

I am concerned about the heat generated by the motor while free running. It was running at full speed with no load for a 2 minutes and it get warm. So a fan will be needed to ensure the magnet health.

Steps before first run

• Add belt tensionner
• Enlarge frame
• Wooden deck
• Throttle wiring
• Attach fan to motor