Search found 122 matches

by RIPPERTON
Dec 14 2018 5:15pm
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

Just for curiosity :) What is your sprockets sizes for 120km/h. 13-35, 2.7:1, The Motors are still doing 6200 rpm even after being ripped in half. After 6 years and 4600km of racing and practice in the race bike, some of the YGS LiPo cells are starting to go low voltage, ie they wont charge above 3...
by RIPPERTON
Dec 09 2018 12:45am
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

The new 120kmh sprockets are on and the kart still has that same launch power but its at a slightly higher speed. I thought the taller gearing would kill the corner exit speed. The new sprocket hubs took ages to make but the are great and will also make some new 90kmh sprockets to fit them just in c...
by RIPPERTON
Nov 01 2018 8:11pm
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

StuRat wrote:
Nov 01 2018 4:45pm
Awesome! I want one.
Make your own !
The perfect time to be a pioneer.

Youre in virgin territory....
I like virgins !
by RIPPERTON
Nov 01 2018 2:39pm
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

Why not mount the batteries under the steering? Wouldn't that help with getting more weight on the front tires? Probably too much. Im going to try to put the boxes in the same longitudinal position as the fuel tank. The current position of the battery boxes is further rearward than where the fuel t...
by RIPPERTON
Nov 01 2018 1:27am
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

I would think the independent motors should work well as a differential, but I guess you're seeing otherwise. Increasing the gearing should be pretty straightforward and should also help with the steering issue . Thats right. taller gearing means the motors have less torque and less directional eff...
by RIPPERTON
Oct 31 2018 9:06pm
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

Nice work on the motors. Thanks. It gets out of turns well but it is geared too low. I reached top speed about 10m into the main straight and cruised at about 90kmh for the whole straight. The fact I am understeering or pushing under throttle coming out of turns proves my theory of splitting the ax...
by RIPPERTON
Oct 31 2018 1:38am
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

They were Motenergy 0913's but the stators were separated and new rotors made. Just came back from a test trip at Cameron Park Kart track in Newcastle. Clocked a 1:05.681. Not bad for its first time on a proper track. The chassis felt good and got it to go around turns fairly well. I had to get on t...
by RIPPERTON
Oct 13 2018 6:24am
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 20
Views: 1255

Re: RIPPY KART

Yup GoKart "diffs" are the next big thing. The chassis feels so natural going around any sized turn because its not being twisted into a pretzel and heaved up onto 3 wheels. The steering is also effortless and I've "geared" it down where the tie rods connect to the column so there is less movement a...
by RIPPERTON
Apr 06 2018 6:49pm
Forum: E-Vehicles General Discussion
Topic: MotoGP electric catagory "Moto-e
Replies: 14
Views: 1309

Re: MotoGP electric catagory "Moto-e

Ex 250GP rider Sebastian Porto show boats around Argentina GP track on the new Energica EGO Moto E bike.
http://www.motogp.com/en/videos/2018...oe-bike/254239
by RIPPERTON
Dec 19 2017 7:56pm
Forum: E-Vehicles General Discussion
Topic: MotoGP electric catagory "Moto-e
Replies: 14
Views: 1309

Re: MotoGP electric catagory "Moto-e

I thought for sure Dorna would go to someone like Suter or Kalex to design a ground up unobtainium race bike, basically an electric MotoGP bike with quick swap battery but they went the easy route and got a sanitized production model off the show room floor. Nobody got their hands dirty. At least th...
by RIPPERTON
Dec 17 2017 3:05pm
Forum: E-Vehicles General Discussion
Topic: MotoGP electric catagory "Moto-e
Replies: 14
Views: 1309

Re: MotoGP electric catagory "Moto-e

After having heard about Dorna's venture into Ebike racing 2 years ago, I wrote to them offering my services as design consultant. It was a long shot but having looked at the Energica EGO Im relieved that I could still come up with a better bike. The road going version weighs a staggering 258kg but ...
by RIPPERTON
Jul 13 2017 6:17pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

The CG of the trike was so low relative to the pivot point that squat forces from accelerating the mass were almost non-existent. In that case, of course there would be "jacking" from the thrust at the wheel acting through the pivot point . Hang on, let me get this right, You actually think that th...
by RIPPERTON
Jul 12 2017 3:34am
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

Oh, and BTW your blue bar in the earlier drawing, will cause the motor torque to act on the suspension. No it wont because its no longer torque. Its been converted into thrust and aimed directly at the swingarm pivot therby neutralising it. The blue arm is in tension under accel so the reaction is ...
by RIPPERTON
Jul 11 2017 5:00am
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

motors affixed to the swingarm will become the norm. If your a good salesman, go ahead, convince the world that pogoing up and down is the way to go. Dont forget the torque reaction is proportionate to the torque of the motor. The more power you have the more obvious the problem. Personally I dont ...
by RIPPERTON
Jul 10 2017 4:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

Ohbse wrote:On my Giant DH comp running a hub motor the reaction forces that Ripperton is describing under quick acceleration on the stand results in the swing arm SLAMMING into full droop.
Where does the stand support the bike. By the axles or the BB.
When you say droop you mean the swingarm drops down ?
by RIPPERTON
Jul 09 2017 5:16pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

Ripperton you are hard core man. Just came across this on the tube. 210 kw electric R1. And no chicken strips, you pushed hard man. Thanks macribs, very kind but I have to confess. The lack of chicken strips are courtesy of my rider (Brad Swallow) as these tires were on the bike at the last round o...
by RIPPERTON
Jul 07 2017 5:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

Battery box is 500x300x150, could fit 3.5 - 4 kWh in there.
by RIPPERTON
Jul 07 2017 5:06pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

spinningmagnets wrote:ripperton, you seem to be very passionate about this subject. Help me learn...please post your "best compromise" frame configuration and motor placement.
Sure, I would start with the Yellow bike and make a few changes. See what I can do.
This thread seems to have risen from the ashes.
by RIPPERTON
Jul 07 2017 4:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

more battery room, where?? or do you mean INSTEAD of a main frame mounted motor? yeah. look at the battery cavity on the yellow bike, MASSIVE. Even though it has faults, it also has good design features. Just the fact the battery is on a 45 degree angle causes the motor to remain low and ground cle...
by RIPPERTON
Jul 07 2017 3:59am
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

The red drawing is the torque arms? But what are the blue? And how does it work? Wouldn't that keep swing arm from working/moving? The red torque arm being connected to the motor axle will want to turn anti clockwise in the picture so the blue arm will be in tension. The motor in turn will want to ...
by RIPPERTON
Jul 07 2017 2:48am
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

the motor axle would be attached on the red part with an additional pivot at the place of the axle. between the red and blue part there is also a pivot. right and between the blue part and the frame, another pivot. The whole thing should swing with the suspension not colliding with anything. more b...
by RIPPERTON
Jul 06 2017 11:44pm
Forum: E-Bike Non-hub Motor Drives
Topic: DD Hub as a mid drive motor pros and cons?
Replies: 120
Views: 10479

Re: DD Hub as a mid drive motor pros and cons?

Torque arm converts torque reaction in the hub axle into tension and redirects it to the frame thereby neutralising it as far as squat / jacking is concerned. The motor is mounted in the swingarm but not in a fork / pinchbolt but in bearings. The motor axle would spin if the torque arm wasnt attache...