3WD trike?

[Doctorbass]

I,M wondering what acceleratioo i woudl get with 3 wheel drive on my e-trike

let say keeping the actual rear 5304 and installing t front hub motor on the front

The major weight is exactly on these front wheels.. and i already have amazing acceleration using the rear wheel.. so that combo would be monstuous

I woudl just need to match the KV of the front motor and the rear motor(5304).. with the HX motor or the 9C motor for the front... I see that the 2807 motor seem to match pretty good the 5304

And install two more controller.. and make my 28s4P a123 suffer a little bit :lol:

Doc

 

[zombiess]

This sounds like fun. If you do it, you HAVE to go back to the track. I wanna see a 60' time under 2 sec which would drop your 1/8 time by a LOT. Your trike would be brutal on take off. Videos would be mandatory!

 

[liveforphysics]

I want to see it just for fun as well.

The path to get fast though is always to ignore the front wheels and figure out how to get more power to the rear wheel. Don't give me the traction sob-story either, get a good sticky tire on it and drop the air pressure until it hooks.

 

[dennyt]

C'mon, share your FWD tricks!

 

[neptronix]

You're only running '4p' of A123 cells? i hope you're not talking about the 2.3AH units. That is definitely battery torture and the sag would slow you down if so..

3WD needs to be done, for sure !

 

[John in CR]

4p of M1 cells is the least of his worries. eg I need a lower power motor for a front on a 2wd, so I'm putting an X5304, and the darn thing is so slow that I have to put an extra 12V in series for the X5's leads. That's in a 24" wheel, but my rear motor is a 20". :lol:

 

[LI-ghtcycle]

Why go to all that trouble?

Just get that hub motor set-up as a mid-drive and get 2x the range you have now and any time you feel the need to burn rubber, just down shift! :wink:

While you're at it, what kind of trike? Tadpole I'm guessing?

I would like to see something like the Varna Tilting Trike with some serious power to both rear wheels using a differential!

Or I guess you could just run dual hubbies if you must ....

 

[AussieJester]

Lose the frock Doc (hehe that kind a rhythms) buy an etek mars or a golden motor like Luke used on his bmx race bike, get one of the nuvinci hubs pick up a 20 x 4.25in wheel, get the tire pressure down and you won't have to worry about powering the front wheels, they will be skimming across the track surface :wink:..

KiM

Edit: forgot your a no noise freak, run a belt setup the are very quiet, out of all the bikes I have seen in person and ridden next to Matt'Ps cyclone/belt Setup has been the quietest I have heard

 

[Doctorbass]

Here is the reality.

NeptroniX: 4p A123 cells of 2.3Ah can take 280A continuous and 600A burst for 10 sec... a little less C rate as Killacycle guys are using

Dont forget that the A123 are 30C continuous and mine a re matched at the 1/10 miliohm from every 1s4p groups!.. i matched like i match every of my battery pack using mathlab optimization software wich make my pack perfectly matched in RI and capacity :wink:

so no worrie unless... for the little voltage sag.

I have 34 dewalt pack sitting here that i still wonder if i sale them or keep them for me.. hey hey.. thats, at least 272 more A123 cells and i also have 40 brand new A123 cells direct from the A123 factory.. + 60 otehr celsl that i already measured all their parameters.. so.. no worrie for the power... and this is if i dont use the 24x 31Ah kokam cells

As for Matt' s etrike, we already compared our performances and we concluded that our power is really similar but i have more powerband and he have little more acceleration from the dead stop

Aussi, I never broke any belt on my hub motor and i dont want to :wink:


Now about the power to the rear wheel or a 3WD..:
The weight distribution on the etrike right now is exactly1/3 on each wheel with me on the trike ( 83 pounds per wheel)
That's 160 pounds on the front so using hub motor would certainly help :wink:

I was attracted by the idea of 2WD and never tried that.. now with teh etrike.. that could be a great idea for 2012

Tire pressure is at 13 pounds wich is ethe best trade off i found: Perfect on teh pavement, perfect on the dirt and perfect on the drag lane ( rear wheel is a 20 x 3.00.

Doc

 

[Kingfish]

Doc, all I can say is that it will be a kick in the butt! Go for it!

I presume you are going to have three independent controllers running async, yes?

Cheering you on, KF

 

[rhitee05]

Doc, don't forget that even if the weight is perfectly distributed standing still, a substantial amount of weight will transfer to the rear wheel under hard acceleration. 3WD might help with maneuvering, especially if you did some sort of thrust vectoring with steering, but RWD is still king for acceleration.

 

[theRealFury]

Doc, don't forget that even if the weight is perfectly distributed standing still, a substantial amount of weight will transfer to the rear wheel under hard acceleration. 3WD might help with maneuvering, especially if you did some sort of thrust vectoring with steering, but RWD is still king for acceleration.

+1 to that... the only reason you would want to add power to the front wheels when looking at an acelleration perspective would be when the rear wheel can no longer keep traction with the power supplied. and as Luke suggested, if you need more traction, get a nice fat racing slick on there and keep the PSI down. Im sure you can get more than 10-15hp at the wheel out of that back wheel before it slips?