HobbyKing Forums - Electric Mountainboard

Author

Message

Topic Search

Topic Options

Post Reply

Create New Topic

Printable Version

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Topic: Electric Mountainboard
Posted: 12/Aug/2010 at 5:33am

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 5:37am

Fried both the Sentilon 100A esc's at the same time trying to do a burnout. The esc could sync with the motors and they fried. One let the smoke out and the other just wont respond to any inputs...

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 5:43am

I fries 2 of the 4 Hobbyking 150A car esc's. One went out on the front so i took of the front motors off. Then a couple of weeks later one fried on the rear so i replaced it with the spare from the front.

I thought i fried another last week but is was just the HK-010 Power Analyzer fried, which made the esc stop working. I took off the esc only to figure out it was fine... I will be putting i back on now.

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 5:46am

Sooooo much fun!!! Big smile

Ever since i got my first mountainboard, I've always wanted to be able to go back up the hill, after i ride down it. Now its a reality! Thumbs Up

Jony

N/A (N/A)
USERID: 0
HobbyKing aficionado

Joined: 19/Feb/2009
Location: St. Johann
Online Status: Offline
Posts: 282

Quote

Posted: 12/Aug/2010 at 6:03am

Maybe HK brings out some ESCs that can charge the LiPos by using the brushless motor as dynamo... ;-)

Edited by Jony - 12/Aug/2010 at 6:03am

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 6:12am

3rd Version 4wd (used to be)

Specs:

Motors: 4 Turnigy 63-64-280Kv (now 2)

Power: 1800-2000 watts peek from each motor (on the rear probably less on the front, when it had 4 motor)

8000 watts peek power total.

Power pulling from batteries * motor efficiency * connector resistance * chain drive losses

8000 * .75 *.95 *.95= 5415 watts of mechanical power to the ground

Over 7 Hp to the ground!!! No wonder it can throw me off the back of it!

Esc: 4 Hobbyking 150A Car esc's (now 2) i like car esc's so i can have electrical breaks

(I don't really trust them though.... the motor's will cogg out on one of the motors if you pin it really hard, they both don't always start perfect.)

Remote: Spektrum Dx3s

Reciever: SR3300T

Power meter: Hobbyking HK-010 watt meter (both of the 2 fried, i think i'm pulling too many amps though them, i fried the trace in the board)

Batteries: 4 Turnigy 5000mah 6s 20c lipo's

Charger: Mastech 600 watt power supply

Speed: 31Mph geared (my telemetry's rpm sensor fried, so no actual mph. I will test it beside my friends car, soon.)

Range:10 miles up and down steep hills. Don't know the range for flat ground, too boring to test.

It barely slows down going up the steepest hills i can find. 1000 foot climbs in 1 or 1.5 miles or so....

Run Time: 20-30 minutes depending on the hills, but i always seem to get 9-10 miles distance exactly, no matter the run time, on the hills...

Edited by Humboldt,Ca - 12/Aug/2010 at 6:24am

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 6:19am

Originally posted by Jony

Maybe HK brings out some ESCs that can charge the LiPos by using the brushless motor as dynamo... ;-)

I wish they would.... Hint hint.

I know it is possible because if i turn off the speed controls, and roll down the hill the sec tries to start up.

The esc beeps like its turning on and it feels like you put on the breaks. I was trying to figure out what was going on, the i realized the motors power was trying starting the sec.

There must be a way to make a esc act like a generator controller. Any one with info please respond, i would love to figure it out.....

Eric1180

Platinum (US)
USERID: 48018
HobbyKing aficionado

Joined: 26/Feb/2009
Location: La Vernia,Texas
Online Status: Offline
Posts: 1061

Quote

Posted: 12/Aug/2010 at 6:50am

Wow you go through a lot of electronics....! Don't forget to recycle that $hit! At the rate your going through'em i would expect to find lead in your water.

I do like you determination Thumbs Up

i would of given up at that point. There where 2 things i didn't like about mountain boarding. it was not having a break to stop Dead

and the second was having to walk back up the hill Dead

Edited by Eric1180 - 12/Aug/2010 at 7:08am

�^7\

Humboldt,Ca View Drop Down

Platinum (US)
USERID: 240434
HobbyKing aficionado

Joined: 25/Jun/2010
Online Status: Offline
Posts: 391

Quote

Posted: 12/Aug/2010 at 6:56am

Videos:

http://www.youtube.com/watch?v=HvzQm8fky8Q Following the school bus up hill

http://www.youtube.com/watch?v=KWeE82sVI1U Off-road

http://www.youtube.com/watch?v=X7g6eaY21t8 Arming sounds

http://www.youtube.com/watch?v=P0zEbHWt4iQ More Off-road

http://www.youtube.com/watch?v=F4S1ftMWd5Q Burnouts

http://www.youtube.com/watch?v=QKTgbubRxXk More off-road

http://www.youtube.com/watch?v=KS0S51bi-I0 Wheelies

http://www.youtube.com/watch?v=u7PMyx7BqB4 No load spool up

I get looks and hollers all the time while riding around. I was riding once, and a sheriff stop in the middle of the road with his hand out the window. I stopped and he just wanted to tell me how impressive my mountainboard was. He was all saying i should find someone to invest in me building a bunch of them to sell for summer.

Eric1180

Platinum (US)
USERID: 48018
HobbyKing aficionado

Joined: 26/Feb/2009
Location: La Vernia,Texas
Online Status: Offline
Posts: 1061

Quote

Posted: 12/Aug/2010 at 7:00am

Ps... maybe try to shorten the length of any wires as much as possible and add more cap's to your ESC. Capacitors... you have long of wire going from the ESC to the battery add capacitors to the ESC on that side of the wiring. That should help remove any negative effects of having long power wires. Also Try to shorten the wire's going from the ESC to the motor's. In the last picture you crossed them because of there length. Remove the Excess. You also said you fried 2 ESC before because they lost sync and long wires can do that.

�^7\