e-bike Project for racing events

[yaqwerdx]

Hello,
in our region e-bike races are very popular, so a few friends of mine and I had the idea to try this. There are some rules for the races, i.e.: it has to be a D.I.Y.-kit, the race is about 6km, it should have a pedelec function (more sores from jury),...
I had a look at:
-) crystalyte (Motor 406; Controller: 72 Volt controller)
-) goldenmotor (MagicPie Kit, maybe with infineon 72V Controller)
-) BMC Motor Kit
I think it should minimum reach 60km/h, and i would be happy about a pedelec funktion (not condition).
Are there any suggestions to these kits? Or to completely other kits?
Are there differences between the difficulty of the mounting?

Thank you for reading
(and excuse my english )

 

[dogman dan]

Have you got a watt limit? Or volt limit?

The race is too short to have to worry about melting a motor, so that's good.

I would think that from that list, a BMC in the high speed version would be faster off the line.

But any direct drive motor is pretty fast off the line when it's fed 3000 watts or more. 8)

I'd consider only rear motors, even though I raced a 47 mph front hub. Mine was a 9 continent 9x7 winding. 110 v.

Run it on the best batteries you can get, such as lipo with a nice high C rate or A123's. Use a controller that puts out at least 40-50 amps unless not allowed.

 

[yaqwerdx]

Thanks for your answer!
There's an open class in which we drive, where are no watt or volt limits.
Why do you prefer the BMC Motor? I saw good projects with these motors, but their website confuses me :? are ther any resellers for BMC?
What do you think about goldenmotor or crystalyte, and whats's about your 9 continent?

 

[dogman dan]

There are so many ways to power a motor, it's hard to say much that is definite. But suppose you ran them all on the same controller, say 48v 40 amps. And you use a 26" wheel, or 700 mm wheel.

In this case the golden motor would be expected to perform pretty similar to the 9 continent motors. They are constructed similar.
It would take off fairly fast, and likely reach a top speed about 40kph, perhaps 45 kph.

The 406 motor has a smaller diameter, and it has a faster than most winding. That means it will start out a bit slower than the golden, but reach a faster top speed. Perhaps 50 kph. If you don't have a long straight to reach that speed, then the fast top speed will not do you any good.

The BMC though, in the high speed version also has a higher top speed, around 50 kph, but also takes off faster than the direct drive motors since it has the gears that improve it's starting out performance.

Since your race is short, you may want to use a motor that gets going faster, such as the bmc.

On the other hand, like I was saying, throw 3000 watts at a direct drive motor, and it will take off fast enough to burn rubber. So if you are heading that way, like 72-120v then go with a direct drive motor. It will take off plenty fast. At 72v 40 amps, a direct drive like the 9 continent or the golden often reaches 40 mph, not sure what that is in kph, 65 ? Any above that speed, and you better know how to ride, and how to crash.

 

[yaqwerdx]

Hi again,
i talked with my friends, and i think they will decide for a crystalyte HS rear motor, with the crystalyte controller. We want to run it at 72V.
Do you have suggestions for goog 72V packages, or two 36V packages in series? i've been searching in the internet, but there aren't any comparisons or so.

 

[dogman dan]

Hobby King lipo for racing. For sure. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=17255

The link above is some of the best stuff, but lesser C rates work ok too if you pair the packs up into 10 ah 5 s blocks. Your race is so short, I'd be tempted to just use 5 ah of the best you can get. 20s is 72v with lipo. So 4 blocks of 5s lipo connected in series gets you 72v.

Make sure when you order, that it is IN STOCK.

Motor sounds like a good choice if you get the sensored one. Sensorless high power seems to still be problematic for some. I can't say from experience, but find the threads on that motor here for more info. There seems to be some issues with losing synch at really fast speeds. Should make the 40 mph club on 72v 40 amps.

Lyens, in the for sale new section here, sells nice racing controllers.

 

[etard]

it has to be a D.I.Y.-kit

This makes me laugh when talking about hub motors. :wink:

But seriously, if you want to have a huge advantage over the other racers, an external motor geared proper should give a nice advantage off the line. When the hell is somebody gonna put a three speed hub inside of a hub motor??!!!

And where are these ebike races popular??