Modified Board

Bob K's picture
Typical range: 
twice around the block,more with nimh to be reported at a late date
Top speed: 

This is a conversion of a chinese knock off of the BMW street carver as designed
by Rudi Meuller. It was a short board of 150 watts and a 3 button wireless controller
that featured slow acceleration and braking ramps. This is a nice feature, actually.
I made it into a long board ( 48 inch ) and added a bigger 450 watt Unite motors MY-7618
24V motor.
I have a hitech R/C transmitter and reciever going to a Jetti 80 amp brushed speed
controller. It also has a deadman's switch so if you step off it shuts down.
The original 7 Ah SLA batteries would only deliver 4 aH's at the power levels the
450 watt motor requires. I have since changed to 4 aH Elite brand Nimh sub-c batteries
( 20 total). This saved over 10 pounds! These deliver enough instantaneous amps that the HTD belt snapped on the first try with the Elites! A new belt is on order. More to come.

Seating capacity: 
On a skateboard??
A hot mamma
HTD belt
MY-6812 ,brushed
Number of wheels: 
Jetti 80 amp brushed
Hitech R/C charger
20, Elite 4000mah Nimh
Method for 12v system: 
Miles as an EV: 
2 miles per charge. SLA's fail at 20 amp load,just installed Nimh
Curb weight: 
25 lbs. with nimh
Conversion time and cost: 
Rietti short board,150 watt, to long board 450 watt . $130 for board,$75 motor,$100 batteries,free controller,$75 R/C equip.

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Re: Modified Board


Re: Modified Board

Hello Bob,

Sweet looking ride I must say. I'm an engineering student from Finland starting my own e-board project. Bit of noob to electronics, so I still have some issues involing what parts I need. Finding parts is the hardest part as they all need to be ordered from abroad.

I'm also going to use an MY7816 motor, but my problem comes with the receiver/controller. Is your receiver directly connected to the controller, or did you have to do any tweaking. Is your 80amp Jeti originally meant for e-scooters to be used with a manual throttle?

I haven't found any info anywhere whether the controllers can receive directly from a PWM receiver and at what voltage. Can you help me at all in this sector? Can you share your controller and receivers exact models?


Re: Modified Board

fantastic work Bob,
thanks for the info...
I have a question for anyone who may be able to help.. The electronics died on my unit so I replaced them with this:
it works great on the bench but when I'm riding it sometimes it won't switch off. I've tested the transmitter range so I dont' see this as the issue, I'm guessing it may be due to emf from the motor. I've used a separate battery for the control voltage but it had no effect.
Any one care to guess?
BTW I took the hardware off the rietti board and mounted it on a pretty cool deck, , check it out:

The Plan: How to Rescue Society the Day the Oil Stops--or the Day Before
Who Killed the Electric Car? Essential documentary explaining what happened the last time electric cars were killed
Build Your Own Electric Vehicle You need this book if you want to build your own EV
This is what the END of Gasoline looks like - bumper sticker
Build Your Own Electric Motorcycle
Stick it to OPEC - button

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