LiPoly powered 18HP Twin Motor Brushless MONSTER build!

AussieJester said:
Sorry to hear about the setback Luke ECSTATIC to hear you smoked Docs 100m time :)
Your carrying a hell of alot less weight i can't see how it will be possible for Doc to get even close to that
time with a hub...be interesting to see how he goes about trying though :)

Hope your up and running again soon Luke...best of luck with the new esc

KiM

Apprentice Gangsta 8)

p.s when your running again any chance you and Methods could get a video of side by side 100m
run ? Might be just the stinging Patrick needs to pop 3 rc motors on his Stinky hehehe
Click to expand...

Yeah!.. that is awsome.. there is at this time one person that i know that beat me on the 100m with proof... LOWELL.. I have his video.. he do a 0-64kmh in 7sec at 8000W


iMs still waiting for the video of Liveforphysics :wink: .. i'm kidding!.. I believe you anyway.. 6sec is impressive!

But I have my secret weapon!! :lol: :twisted: no one know what is it 8)

Doc
 
Did some riding today with my KTM dirtbike. 73bhp at the rear wheel. 220lbs.

That is the good stuff. Pulling the wheel up effortlessly at 50-60mph is what I need, and easily blasting up to 100+mph. And I love shifting. It has a close ratio 6spd sequential gear box, and that is just too damn fantastic. Fixed gear stuff just doesn't feel right. I've kinda got this idea brewing in my head for my next bike. Cutting up a dirtbike crankcase to mount motors that drive the input shaft of the tranny. Big serious motors. Like dual Agni motors mounted on a common shaft driving the input to the dirtbike tranny. Then cutting a bike frame to fit the motor/tranny in the optimal location, and then welding the bike frame into brackets onto the motor, so the motor becomes a stressed part of the frame and completes the missing area that was cut away to fit it in. Then lots of LiPo. Lots and lots of LiPo.

That will be the sort of E-bike I need. I'm not interested in an electric motorcycle. My attraction to the E-bike is the ultra low weight and the ability to legally fall under bicycle rules and silence. I think I could manage to make that all happen with the above described project.
 
ooooh pletty predator conversion, nice 8)

D
 
Luke,

I use a slightly smaller version of the motors you use but the same controller. My setup pulls 140A+ when I crank it open at low speed - even with a very healthy and capable nimh pack behind it the volts drop enough to cause 'apparent' sync issues - and this is on 24V. I have 6 motors here that I have fried so you are not alone in these problems.

The solution for me was a big cap ~ IIRC a 10000mfd low ESR one right across the esc input leads. I can now pull away from a standstill with it wide open - leaning forward of course - 3 or 4 times in a row before the stator turns with a 'grind'. I have yet to find a solution for this - just be aware you may run into the same problem. For now, I just don't give it full power without assisting with my legs and full power accel attracts way too much attention anyway. Uh - this was all last year of course - the season is only just beginning now and already my wattmeter has died! :(

Scott
 
sorry yes - now corrected - it is a 10,000mfd 63V low ESR job - used in audio amps.
 
have you seen the new turnigy controller.. it has an burst rating of 180A
because this controller is intended for car use hopefully it is much better for e-bike use

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8921
 
Yup, Methy sent me that link, and I have a pair ordered.

I just got all my hall sensors and I made a pair of upgraded with 4110 fets Infinion controllers, so I'm going to give that a try while those are on the way. I have a hunch it's no different than the version 4 HV 100a unit though... And I assume you saw what I've done to those...
 
chistana said:
How does our role in the global economy affect international relations? How does the U.S.'s role in our global economy affect relations with other countries? How do our trade policies fit into our country's role in the world today? How do trade issues affect international relations and globalization?
Click to expand...

What the heck are you talking about and what has this got to do with Lukes build? :evil:

Go away..............
 
Damn spammers lol.

So, as a very quicky update, I have a k-force rc controler running a little brushless motor off 6x irf4110 fets. Just at 22v right now, and its a cobbled together mess. The point was just to get a proff of concept to mess with and learn how to do it for a big boy controller. I'm thinking of turning my pair of 18fet heatsinked setups into a single 36fet controller. That should be good for maybe 500amps at 84v. One of those setups per motor should get me into the ballpark of power I'm wanting.

Then, once controllers aren't the weak-link, its time to re-wind the motors. Maybe with super high temp insulation square silver wire if I can find it. Or simply fit a pair of the CNCguy motors if they ever release.
 
Was this Luke's build that was stopped by an inadequate soft-start controller? It seems a bit too old, so I have my doubts.
 
Yep. The softstart controllers were so awful to use that it put me off of the project for a while.

When Methy sends me some 18FET instant start boards after he gets the programming stuff all figured out, then I will continue my project.
 
How about an update? In other threads you indicate that there has been some progress. There was a picture of some heat sink covered with fets. What's that all about? Are you still using the pipe fitting to position the hall effects? You mentioned some new weight saving design. How about some pictures, 3d models, or cad drawings?

Bubba
 
I do need to take some recent pics.

Went from 8t to 10t motor drive sprockets. Top speed jumped up 10mph.

Been trying a lot of different controller arangements. Need to quit being lazy and put together the awesome instant start 18fet controllers Methy sent me.

I keep working on making a good sensorless setup, but the only thin that ever lasts is the big sensored infinions.

I've been very busy with getting one of my cars setup for battle of the imports, and its been taking my time lately. Just bought DSS stage 5.9 axles rated to 1000bhp for it, cause I couldn't seem to keep the stage 3.9 axles to last more than a few runs. It sucked. To spend $1900 on a set of axles... but its better than buying $700 axles over and over.

I will see if I can get some updated pics up by the end of the week.
 
More like it sucks to pay $1,400 + $700 + $700 + $700 and axles when you could have put that toward our electric cars :p

If I ever get around to sending you the rest of those fets I owe you I will send all the upgrade parts for your kit.
It has been so long since you bought those that they are already outdated :roll:

-methods
 
Whats going on with this?
 
methods said:
More like it sucks to pay $1,400 + $700 + $700 + $700 and axles when you could have put that toward our electric cars :p
Click to expand...

OMG say it ISN'T so Luke ...unless of course its a DRAG electric car...?

Got pics of your import Luke? :: crosses fingers its either a RX7, R33 or a REX::

KiM
 
Good to see other import owners on here! I just sold my 380hp R32 yesterday after 5 fun years :(
Next car will be a sleeper :D

Paul. :D
 
Timma2500 said:
Good to see other import owners
Click to expand...

I'm not one really i prefer 60-70s muscle cars of any make myself but appreciate all cars and the effort put into them.

My fav car of all time is the AC Cobra (replica) closely followed by XA GT Coupe :)

Anyone interested in checking out some Aussie Muscle cars (and assorted American iron) i went to the Hot Road & Street Machine Show couple of weeks agoe, have pics on my FTP sapce here Some fiiiine machines there, was even a trike owned by a lady in a wheel chair i spoke with 45k for her trike :: OUCH :: was freakin niiiice though.

KiM
 
To the OP, this sounds like a sick bike you're building. :lol:

Just be careful when you're ripping 100mph on it, since it's so light, the slightest inconsistencies of the road will reduce your grip and contact area on the pavement.

I've done 70mph (drafting) down a less than perfect road on my road bike (19lbs) and was nearly catching air off each crack in the road. Though you will be on a full suspension DH bike, it should handle much better. I bet you'll still catch air very easily on secondary roads.


I think if you use a top of the line, beefiest DH rear wheel you should be fine. I mean, those wheels are designed to withstand massive impacts where forces will be much greater on the wheel than even 30,000watts (what's your ft-lbs torque more importantly?), I think....lol.

I didn't read the entire thread, but maybe you should look into a motorcycle drivetrain...
 
You must log in or register to reply here.
Back
Top