Going to HONG KONG for a internship!

By , August 31, 2010 8:51 pm

Some people are getting back to school this September, I am going to my fourth internship in Hong Kong!!

I will work for a toy company in the R&D departement aka toy designer. I will also be doing some SolidWorks which I practice during the last few weeks. I really like SW!

I leave September 1 to Dec 17.  It’s 4 months in a whole new world, a new universe. I will be posting pictures and videos of place I’ll go.

btw, I did no bring my scooter! Instead I’ll go to Hobbyking directly and build a other one! 😛

AddToAny: Share/Bookmark/Email Button

By , August 19, 2010 7:50 pm

I just added the famous “share button” on every page. I guest it can be useful for easy sharing. When I installed the button, there is suppose to be a sort of drop down menu that pop out when you place your mouse over the button. It did not pop with Firefox, only with Chrome and IE. I tested again with a order Firefox and it worked. I realise that I have a firefox pluging call Adblock Plus (ABP) that stop that pop up!  Here is a print screen of the mouse over effect.

share this pop menu

If you have ABP installed ( look at the top right corner of your Firefox window, there is a red octagon with ABP in it) you simply need to tell the program that the share pop is ok to show. This is also in part of the spam list you selected with ABP.

I use the ABP subscriptions call “Fanboy’s List (English)

Why isn’t the drop-down menu appearing?

If you have ABP and can not see the above mouse over effect, here is how you active it:

Click the little arrow next to the red ABP logo. Then click “Open blockable items.” This will pop up a menu at the bottom of the page. You can also just click on the logo directly and the list will appear at the bottom of the page.

share this AdBlock Plus fix

You will see a link called “http://static.addtoany.com/menu/…“, you simply right click on it and click on “Disable filter…“. If you can not see, try to search “addtoany” and it might appear.

Reload the page “F5” and you will then see the share it pop menu appear.

Happy sharing!

Got my Nano-tech batteries

By , August 18, 2010 4:51 pm

So I got my batteries and my charger. It took 6 days. I still paid $57 of shipping!!! ( I was a heavy package, around 4kg (8.8lbs) )  That charger is huge. I can charge four 22.2V(6S) battery at once! That is really nice! My 250W can give 13A at 12V. I will measure with my multimeter see if the charger can deliver that much. I have to be careful because the fuse of my Fluke is 10A!

turnigy charger and batteries

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.

Ryno motors – self-balancing, one wheel, electric scooter

By , August 16, 2010 10:48 am

I was surfing the web and saw this neat balancing electric scooter. It is created by Ryno motors. Here are some videos:

rhino motors seld balancing scooter

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

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.

bombardier embrio

bombardier embrio

Or the Canadian Benjamin Poss Gulak, with his one unicycle with two wheels.
ben gulak uno balacing one wheel scooter

ben gulak uno balacing one wheel scooter

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.

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

Your parcel has been sent from the HobbyKing.com warehouse!

By , August 10, 2010 12:49 pm

I just finish my finals! I have a few weeks off before my next intership.

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.

Test 1

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

Test 2

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

Test 3 – Going up a steep uphill!

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

Test 4 – After 1 kilometer

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

Test 5 – After 1.36 kilometer

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!

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