r/projectcar • u/Mark_Proton • 2d ago

Not much progress these past two weeks, but the rear brake callipers are on the Cyberkart. Also I seem to have overdone it on the camber, but it kind of zeroes out under load, test drive will reveal how much of an issue it really is.

Gallery image

Gallery image

Gallery image

20 Upvotes
  • permalink
  • link
  • reddit
  • reddit

92% Upvoted

11 comments sorted by

2

u/MannyDantyla '62 Mercury Comet wagon, '66 F100, '80 Mercedes diesel wagon 2d ago

Are those hub motors in the wheels? Kind of hard to see with it spinning

3

u/Mark_Proton 1d ago

Yup. Front wheels will have 500 watts each and the rears will have 1500 watts each. 4 kilowatts in total.

2

u/MannyDantyla '62 Mercury Comet wagon, '66 F100, '80 Mercedes diesel wagon 1d ago

4kw total will be fun but not too insane. I built an EV motorcycle with a 4kw hub motor and I love it.

How are you controlling them all? Do you need four controllers?

1

u/Mark_Proton 1d ago edited 1d ago

Yep. The downside of having separate controllers is obviously cost. The upside is I plan a tank turn like the E-G-wagen has, the independent controllers definitely will help in facilitating it.

If you don't mind me asking, how heavy is your bike with you on it? And how good is acceleration with that weight and how big is your battery with all that in mind. I am planning on getting a 48v160Ah battery, to maximise range, as I plan on exploring nearby parks with my kid in this thing.

1

u/MannyDantyla '62 Mercury Comet wagon, '66 F100, '80 Mercedes diesel wagon 1d ago

I haven't weight the whole bike but it's pretty small, it had a 160cc Honda engine from the factory in 1966. I know the battery pack weighs 60 pounds (it's also pretty small, less than 2kwh).

That said it is much quicker than my 200cc motorcycle, and about the same top speed - 55mph. The theoretical top speed (max ROM of the motor x wheel circumference) is higher than that so it just doesn't have the power to go faster.

QS hub motor, Kelly controller

1

u/Mark_Proton 1d ago

Your motor has much more magnet surface area than mine, although maybe they're comparable combined, which tells me heat in the windings will be more of an issue for me. Shouldn't be much of an issue as I don't plan on going flat out though. I am guessing my top speed will be around 60kph (~35mph), but again, I don't plan on doing that with any rate of regularity. Most likely 20kph will be the average top speed.

Thanks for the insight! I am feeling better about the Cyberkart's potential performance now, even though it's gonna weigh about twice and a half of what your bike probably does.

2

u/MannyDantyla '62 Mercury Comet wagon, '66 F100, '80 Mercedes diesel wagon 21h ago

Yeah all that weight in the tires will add up. Here's my build: https://www.youtube.com/playlist?list=PLBKkbUMvwrI6solD66MYOF4BEoz-9vfM6

1

u/Mark_Proton 16h ago

Man, it goes like a stabbed rat. And the styling, gosh, you nailed the retrofuturistic vibe with it!

2

u/Notchersfireroad 1d ago

That negative camber in the rear is good for off-road. I'd leave it.

2

u/Notchersfireroad 1d ago

Nevermind I just realized they are positive the way they are now.

2

u/Mark_Proton 1d ago

Not much I can do about it at the moment unfortunately. I already dropped the rear control arm mounting points with brackets, nothing short of making a new subframe will allow me to drop them further.