Search found 31 matches

by Boulter EV
Jul 25 2017 5:58am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Prototype EV for race
Replies: 37
Views: 4700

Re: Prototype EV for race

I'm guessing the reason you would need to increase battery mass to change voltage is because your cells are huge and you only have 1 in parallel. @liveforphysics. Higher voltages nearly always means better efficiency and better power density. But to actually capitalise on this you need to have corre...
by Boulter EV
Jun 22 2017 4:56pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2011 Zero XU - Battery replacement options?
Replies: 6
Views: 3180

Re: 2011 Zero XU - Battery replacement options?

Wise to steer clear of RC stuff then if it's a serious build. In my opinion 18650's are the best choice when buying new if you don't mind the complexity of construction. You're right that you need to choose the right cells but LG,Pano,Sony and Samsung all do a decent automotive spec that is up to th...
by Boulter EV
Jun 13 2017 2:18pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2011 Zero XU - Battery replacement options?
Replies: 6
Views: 3180

Re: 2011 Zero XU - Battery replacement options?

Hello, Lots of options. Depends how good you want it and how much you want to spend. Take a look at my thread: https://endless-sphere.com/forums/viewtopic.php?f=10&t=85758 This is a 14s 55ah pack..... It would fit inside an xu case with room to spare. It would be about the best you could get for the...
by Boulter EV
May 17 2017 3:51pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Prototype EV for race
Replies: 37
Views: 4700

Re: Prototype EV for race

Hello, welcome to the forum. What interesting machine! What is the race?

Is there a reason you're limited to 24v? The easiest thing to do might be to increase voltage and change the gear ratio? I'm sure if your motor is rated at 24v it'd be ok at 36 or even 48.....
by Boulter EV
May 17 2017 3:44pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Hub drive vs Chain drive
Replies: 26
Views: 5543

Re: Hub drive vs Chain drive

As a plus point for hub motors you have none of this to worry about!
by Boulter EV
May 13 2017 1:14am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Hub drive vs Chain drive
Replies: 26
Views: 5543

Re: Hub drive vs Chain drive

Just to add my 10p in, hub motors aren't just heavier, they are also unsprung mass, affecting the ride and handling. With a separate motor you have more flexibility over you rear axle design, but by far the biggest advantage is what John says, higher motor speeds equals better efficiency and better ...
by Boulter EV
Apr 08 2017 9:44am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Hi BB, like macribs says It's only valid in the UK. For this to be registered in another country it would have to pass the local tests. Which for most EU countries shouldn't be too difficult. I am looking into homologation for within the EU, but this is likely to be just something I investigate rath...
by Boulter EV
Mar 14 2017 7:47am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Thanks UKPhil! I've not had any problems getting the bikes through an MSVA as all the parts exist. What I have been developing is a way to keep it premium and light so I've made some special things which I'll share on here shortly. More and more things are available, since I got my first bike though...
by Boulter EV
Mar 12 2017 5:31pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: BobCs emax scooter thread
Replies: 88
Views: 10129

Re: BobCs emax scooter thread

I promise, if this ever becomes mobile, I'll glue that gurt big inductor down!!! :) At the moment I'm sorta thinking I'll do an SMD version of the control actually on an updated "power" board to use in a vehicle. The system I have (above) is great for debugging and gaining experience but it probabl...
by Boulter EV
Mar 12 2017 12:20pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Hey BEV all the normal stuff, batteries, balance/charge control, motor drives... Most of it documented on here :) I've been reading your arduino cell balancing thread, I'm not going to comment on it yet because I've got about 6 months more to read but I'm looking forward to finding out how you got ...
by Boulter EV
Mar 09 2017 10:02am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 7256

Re: 50cc equivalent motor setup help.

I now have here a 50v/50a continuous 75a peak switch, can this replace the contactor and start switch? Hi there, this switch cannot replace a contactor I'm afraid. A contactor is designed to switch in a controlled environment so that the sparks are unable to oxidise. A contactor will also be contro...
by Boulter EV
Mar 08 2017 6:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Hi bobc, thanks for the comments! I am intrigued at what gizmos you're tinkering with!
by Boulter EV
Feb 23 2017 4:40am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Ah ha, good spot! I didn't even know this was still there!

Yes, this was a while ago, first bike I got road legal to prove the concept.

I used turnigy batteries at the time but decided to build by own packs as there was nothing, and there is still nothing available off the shelf that's good enough.
by Boulter EV
Feb 16 2017 5:50am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

How would you go with insuring one? As I understand you would have to get a Q plate. The last time I was going through with insurance I couldn't find a single company who would allow self built motorcycles :( hi there. This bike doesn't classify as a self build. Because I have a company, this bike ...
by Boulter EV
Feb 13 2017 5:44pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

I am very impressed by your design. Did you capture any of your frame fabrication in photos? I'd love to see any details on how you made that frame as it meet my definition of "perfect" very very well. I'd buy that frame in a heartbeat if it were commercially available. -Jim thanks Jim! Great to he...
by Boulter EV
Feb 02 2017 11:22am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Thanks! You should start your own thread! I would like to see your frame and battery! Whats the battery going to be size wise? have you thought about spot welding with nickle steel tabs? It's by far the easiest route in my opinion. I do like spinning magnets solution though I have to say!
by Boulter EV
Feb 01 2017 5:24pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Thanks for the comments! I am planning to post some videos of it in operation soon!
by Boulter EV
Jan 26 2017 2:55pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Thanks! I use a 140t sprocket on the wheel and 12t on the motor. It's 11.6:1 It's #219 chain used on go carts. I got these custom sprockets from rocket sprockets. The motor does about 6000rpm. The bike is mechanically restricted to around 37mph with those sprockets, I took one bike to 60mph once but...
by Boulter EV
Jan 24 2017 1:58pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

The reason I was asking about 21700 cells is because of what I read on the net about them. Still don't know if it's true but those cells are between 5750 and 6000mah. But even if it's not true and they just have 5000mah, that would still be a drop in volume of around 20% for the same amount of ener...
by Boulter EV
Jan 24 2017 9:42am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

In the meantime I need to work out how to reply to people's specific questions on here by bringing in the question into my reply, how do I do that? Thanks! In the upper right corner of everyone's posts there is a button saying ''quote''. Click on it and that post will appear in your reply so you ju...
by Boulter EV
Jan 24 2017 5:06am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Thanks, converting your insight to lithium would be a good project!

I'm in the midlands near Coventry.

We use pulsed arc welding on the tabs rather than resistance welding which is how most spot welders work. This is much better for dissimilar metals.
by Boulter EV
Jan 24 2017 2:48am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Hi, thanks for the comments. I've started to look at 21700's. LG are also going to make them, they won't be exclusive to Tesla and Panasonic. However there aren't any significant energy density increases yet, by our measure the biggest driver for moving to 21700 is cost, which is why it'll appear on...
by Boulter EV
Jan 23 2017 6:07pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

I thought 'Aussie rules' (sorry!) about mopeds were pretty similar to Europe?

Stealth electric bikes have been doing this game for a while in Oz but I've always wondered why they never made them road legal?
by Boulter EV
Jan 23 2017 7:39am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Motorcycle (50cc Equivalant)
Replies: 57
Views: 18522

Re: Electric Motorcycle (50cc Equivalant)

Hi, I am in the UK yes. Thanks for your comments. I actually work for an automotive OEM and also do a bit of design consultancy on the side. I need to do some more testing on these parts, and after that the plan is to buy some injection moulding tools to get the piece cost down. I will make them ava...