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General Discussion / Video of new battery from Neal Saiki of NTS Works
« on: July 18, 2012, 08:23:18 PM »
Here is a little video discussion of my new EV battery tecnology.
Neal Saiki
CEO NTS Works
Neal Saiki
CEO NTS Works
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Brammo Forum / Re: Range wars: Is a geared bike more efficient?
« on: June 02, 2012, 01:24:42 AM »I dont understand why they need to have 6 speed gear box, wouldnt a 2 or 3 speed have less fritional losses and weigh less.
2 speed gearbox would make sense low to mid, and mid to high.
most motorbike have 2 speed , fast and stopped.
Yes a 6 speed gearbox is totally overkill. 2 speeds like on a Tesla car is plenty. 6 speeds is more about having fun rather than being practical. I must admit that for the first year of riding electric motorcycles I missed the gearbox. At first it feels weird to do nothing with your left hand/foot. After a long while I got used to it and now I can concentrate on more important things like keeping my front wheel from sliding. Yuck! Of course you don't have to use all 6 speeds, but it's a lot of weight, complexity and maintenance you are paying for.
Different strokes for different folks!
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Brammo Forum / Re: Range wars: Is a geared bike more efficient?
« on: May 13, 2012, 07:37:22 PM »
I'm not sure, but I think that the ranges from Brammo and Zero are from riding on a dyno. The dyno has a load profile that is supposed to compensate for an average wind resistance and it varies with speed. The 70 mph distance from the dyno data is probably pretty close to reality though because neither of those motorcycles are especially aerodynamic. The average sportbike is slightly more aerodynamic.
It also seems to agree with the ranges that people are reporting on the forums.
How aerodynamic can it get? The human powered bicycle 1 minute speed record is 82 mph right now. That's using around 1 horsepower (746 watts). At that rate, a 9.3 kwh battery could go more than 1000 miles. Those bicycles look like missiles so of course a real motorcycle couldn't be anywhere near that, but there are huge gains to be made in freeway range if ony electric motorcycles were more aerodynamic.
It also seems to agree with the ranges that people are reporting on the forums.
How aerodynamic can it get? The human powered bicycle 1 minute speed record is 82 mph right now. That's using around 1 horsepower (746 watts). At that rate, a 9.3 kwh battery could go more than 1000 miles. Those bicycles look like missiles so of course a real motorcycle couldn't be anywhere near that, but there are huge gains to be made in freeway range if ony electric motorcycles were more aerodynamic.
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Brammo Forum / Re: Range wars: Is a geared bike more efficient?
« on: May 09, 2012, 07:21:44 AM »
Both the Brammo and Zero bikes have upright riding positions and you can't really make them very aerodynamic. I'd say it's a wash between them. The brammo is less tall, but it's wider.
Aerodynamic drag is huge, but it's very difficult to get it reduced. The only sure fire way is to reduce the frontal area. I'm a big fan of making narrow bikes with the rider's legs tucked in so the frontal area is minimal. Having low handle bars really helps reduce drag, but my back hurts riding like that.
Aerodynamically the most important part of the bike is the back end. The important part is to smoothly bring the air back together again after it's split around the bike. Screens and stuff on the front really don't do much to reduce drag.
The Hayabusa is one ugly bike, but it sure is aerodynamic. Look at the tail secion, it's actually a little higher than the tank. That does wonders to reduce drag, but then it's hard to throw a leg over and it's like you are sitting in a bucket.
Neal
Aerodynamic drag is huge, but it's very difficult to get it reduced. The only sure fire way is to reduce the frontal area. I'm a big fan of making narrow bikes with the rider's legs tucked in so the frontal area is minimal. Having low handle bars really helps reduce drag, but my back hurts riding like that.
Aerodynamically the most important part of the bike is the back end. The important part is to smoothly bring the air back together again after it's split around the bike. Screens and stuff on the front really don't do much to reduce drag.
The Hayabusa is one ugly bike, but it sure is aerodynamic. Look at the tail secion, it's actually a little higher than the tank. That does wonders to reduce drag, but then it's hard to throw a leg over and it's like you are sitting in a bucket.
Neal
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EV Stocks / Re: Neal Saiki has a new battery technology and is launching a startup company
« on: May 09, 2012, 06:49:03 AM »
Thanks for the kind words guys! It seems like just yesterday when I was searching the forums on how to build my first electric dirt bike.
I will consider selling battery packs to individuals if I can figure out the liability problem. The liability insurance premium might be crazy, if I could even get insurance to cover that part of the business. It would be great to help out home builders. I always enjoyed everyone who came by the shop to show me their home made EVs.
Neal
I will consider selling battery packs to individuals if I can figure out the liability problem. The liability insurance premium might be crazy, if I could even get insurance to cover that part of the business. It would be great to help out home builders. I always enjoyed everyone who came by the shop to show me their home made EVs.
Neal
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Electric Motorcycle News / Re: MIC develops electric motorcycle test
« on: May 09, 2012, 01:01:07 AM »
I think the best way to estimate range is simply by using the battery pack capacity. The efficiency of the motor/controller/drive doesn't vary that much. Aerodynamics is probably the biggest variable.
Check out my thoughts on the subject:
http://www.ntsworks.com/Range.html
Neal
Check out my thoughts on the subject:
http://www.ntsworks.com/Range.html
Neal
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Brammo Forum / Re: Range wars: Is a geared bike more efficient?
« on: May 09, 2012, 12:09:58 AM »
Let me add a perspective from someone who has designed many of these drive systems.
As far a range is concerned, no gears are better because with a really good electric motor (not some off the shelf unit) you can get near 90% efficiency through a broad speed range. It's tricky to read these constant voltage motor graphs because EV's use variable voltage for speed control. For most speeds, you can operate from 85% to 90% efficiency. Adding gears just wastes ~5% efficiency.
The problem is how to have both good top speed and standing start torque. The reason that the car guys can do it is because the have very high motor voltages which gives the motor top end RPM and then they have a better gear ratio for starting torque.
For electric motorcycles, you really need well over 100 volts to have something that does both well. So far, most of them just haven't got there yet, but they will.
Now I'm not saying a gearbox isn't fun. It is fun, but not a necessity.
Range has to do with battery capacity. The battery, motor, controller and drivetrain are all very efficient (90% or more) if they are designed correctly. Check out my article on range
http://www.ntsworks.com/Range.html
Neal
As far a range is concerned, no gears are better because with a really good electric motor (not some off the shelf unit) you can get near 90% efficiency through a broad speed range. It's tricky to read these constant voltage motor graphs because EV's use variable voltage for speed control. For most speeds, you can operate from 85% to 90% efficiency. Adding gears just wastes ~5% efficiency.
The problem is how to have both good top speed and standing start torque. The reason that the car guys can do it is because the have very high motor voltages which gives the motor top end RPM and then they have a better gear ratio for starting torque.
For electric motorcycles, you really need well over 100 volts to have something that does both well. So far, most of them just haven't got there yet, but they will.
Now I'm not saying a gearbox isn't fun. It is fun, but not a necessity.
Range has to do with battery capacity. The battery, motor, controller and drivetrain are all very efficient (90% or more) if they are designed correctly. Check out my article on range
http://www.ntsworks.com/Range.html
Neal
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EV Stocks / Neal Saiki has a new battery technology and is launching a startup company
« on: May 08, 2012, 11:51:17 PM »
I have a new EV battery technology that I am announcing today. This is pretty big step towards more range at less cost. It's most similar to the Tesla battery, but simpler and easier to manufacture. I think that this is the tipping point when the industry takes off.
I'm also selling stock in my new company. If you are an experienced investor, please check it out.
http://www.ntsworks.com/
Thanks,
Neal
I'm also selling stock in my new company. If you are an experienced investor, please check it out.
http://www.ntsworks.com/
Thanks,
Neal
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