Search found 13637 matches

by neptronix
May 13 2021 11:06pm
Forum: EBike General Discussion
Topic: juniper motor from ASI
Replies: 1
Views: 142

Re: juniper motor from ASI

No but i want one. All those poles make it a torque monster. The very tight wound stator means you don't pay an efficiency penalty . I would bet that the laminations are razor thin which is an improvement over everything else on the market. It would probably rip in a 20 inch wheel... just add ferrof...
by neptronix
May 11 2021 6:04pm
Forum: General Discussion
Topic: Lightweighting and aerodynamic optimization of a subcompact car.
Replies: 80
Views: 1732

Re: Lightweighting and aerodynamic optimization of a subcompact car.

Yeah i have a shit ton to learn and a shit ton to buy. I'm a fan of thrift stores and garage sales so a lot of the basics will be bought there if possible. Not sure if i have 220v access in my corner; plan to buy everything to work on 110v if possible. Thanks for your encouragement. I'm still not mo...
by neptronix
May 07 2021 5:27pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3318

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

How do your other proposed liquids compare to opticool in thermal conductivity? ( they use a different metric i believe )
by neptronix
May 07 2021 10:36am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3318

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

Chalo wrote:
May 07 2021 10:19am
Once you succeed at making e-bikes leaky and smelly, you can move on to figuring out how to make them emit toxic fumes and obnoxious noise.
That's easy. Increased power density means a burnout is much easier to do. :mrgreen:
by neptronix
May 07 2021 9:06am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3318

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

To go along with my above assertion that anything would be good enough for a year, can you link to these ATF-induced failures? I'd be curious to read what failed. Unfortunately nobody has documented them other than in passing, so the posts are hard to find. What i have read is that ATF eventually e...
by neptronix
May 07 2021 8:41am
Forum: Forum Rules and Features
Topic: Move to XenForo software
Replies: 49
Views: 2078

Re: Move to XenForo software

Just a quick update. A-DamW has done a test migration of phpbb to xenforo and the results of it's importation process are better than expected. I'm particularly impressed with how refined XenForo is on the backend. For users, the search, private message, and posting system improvements are going to ...
by neptronix
May 06 2021 5:04pm
Forum: General Discussion
Topic: Historic "Deathbike" stolen in Oregon, $1500 reward
Replies: 7
Views: 514

Re: Historic "Deathbike" stolen in Oregon, $1500 reward

Extremely frustrating to know that an important piece of history is in the hands of a thief.

Was there at least camera footage? because lane county is known for having severe issues with property crime... so hopefully someone had the foresight to install security cameras there.
by neptronix
May 06 2021 2:57pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3318

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

Yep -- as above, hydrocarbon Redline Likewater would still eventually dissolve grease, but provide better residual lubrication. Besides grease, the other materials compatibility I'd be worried about would be adhesives and phase wire insulation, which is trivial to change for oil-resistant wire. Sil...
by neptronix
May 06 2021 2:51pm
Forum: EBike Non-hub Motor Drives
Topic: CYC X1 Stealth (NEW)
Replies: 27
Views: 1951

Re: CYC X1 Stealth (NEW)

juanjo, thanks for the information, but please don't turn one message into 8 messages in the future!

I would expect his statements to hold true because the CYC mid drives are the only ones that use properly thin 0.2mm laminations.
by neptronix
May 06 2021 9:46am
Forum: EBike Non-hub Motor Drives
Topic: CYC X1 Stealth (NEW)
Replies: 27
Views: 1951

Re: CYC X1 Stealth (NEW)

I'd be interested in it if it didn't have a crazy wide Q factor and could be used on a 68mm bottom bracket.
I always wanted a smaller version of this high efficiency drive. But the low biomechanical efficiency that overly wide pedals creates keeps me away.
by neptronix
May 06 2021 8:24am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 870

Re: E-bike mid-drive motors hardly outperforms hub motors

This is why electric cars generally don't use gears. Friction loss is a bitch even if you have a super efficient motor at the end of it. All electric cars use gears. 1-speed fixed gears, but gears nonetheless. Certainly not direct drive. I know that and you know that; i meant gears other than the r...
by neptronix
May 05 2021 8:25pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 870

Re: E-bike mid-drive motors hardly outperforms hub motors

Actually the right sized hub on flat ground will be 5-10% more efficient regardless of bike. 3 less gear and chain reductions makes a difference. This is why electric cars generally don't use gears. Friction loss is a bitch even if you have a super efficient motor at the end of it. The only thing th...
by neptronix
May 05 2021 2:07pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 870

Re: E-bike mid-drive motors hardly outperforms hub motors

So many bike manufacturers are building with BB drives nowadays because of the low power legal limitations and the light-weight marketing in bicycle industry. They are making very good ebikes for the bicycle sport crowd, but very poor commuters that are high maintenance and low performance. Yes, it...
by neptronix
May 05 2021 1:41pm
Forum: EScooters/EMotorcycles
Topic: special pleading
Replies: 70
Views: 1935

Re: special pleading

I was facing disability myself at one point, and had to walk around with a cane in my 30's due to the effects of bone deformities that nobody knew how to deal with.. I looked at the market for mobility devices and of course was disappointed and figured that i should build one of my own using lifepo4...
by neptronix
May 05 2021 12:12pm
Forum: Motor Technology
Topic: Yamaha develops 496-horsepower motor for electric hypercars
Replies: 20
Views: 671

Re: Yamaha develops 496-horsepower motor for electric hypercars

Quite typical.. unfortunately to get many of these high tech parts, many of us hobbyists will need to pull them out of scrapped cars.
by neptronix
May 05 2021 9:40am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 870

Re: E-bike mid-drive motors hardly outperforms hub motors

The appropriate motor depends on your terrain and conditions. On relatively flat ground ( average of 1-3% grade ), a direct drive immediately wins every efficiency contest due to it's lack of friction from two sets of gears and chain. But loses the power density contest. Once you start climbing majo...
by neptronix
May 04 2021 5:43pm
Forum: EBike General Discussion
Topic: Looking for a 20" foldable fat tire bike that is not an ebike
Replies: 4
Views: 123

Re: Looking for a 20" foldable fat tire bike that is not an ebike

A 20 inch wheeled bike is a good choice if you want to get the most power out of a hub motor. But a lot of them are awfully small or flimsy until you start looking at semi recumbent bikes. I can almost guarantee you'll regret a folding bike as an electric. I haven't ridden one that doesn't seem flim...
by neptronix
May 04 2021 9:25am
Forum: General Discussion
Topic: Lightweighting and aerodynamic optimization of a subcompact car.
Replies: 80
Views: 1732

Re: Lightweighting and aerodynamic optimization of a subcompact car.

I just signed the papers on a ~300 square foot warehouse space which has adequate room for a machine shop on one side, car or crapton of bikes parked in the middle, and electronics shop on the other side. Looking to invest in a small CNC machine, tig welder, and other things i've dreamed of for many...
by neptronix
May 04 2021 9:12am
Forum: General Discussion
Topic: Lightweighting and aerodynamic optimization of a subcompact car.
Replies: 80
Views: 1732

Re: Lightweighting and aerodynamic optimization of a subcompact car.

Seems to me that you could use a much lighter pack of A123 cells to get the same effect. I wish! The big problem with lifepo4 as a car battery is that most alternators want to charge a little higher than the HVC of the cell. If you adjust the alternator's charging voltage downwards ~0.2v to compens...
by neptronix
May 03 2021 6:23pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

I see that the moderators trust and respect the members of the forum. I appreciate this attitude. This is an international forum, so sometimes people who communicate here through any translator may simply not understand what their phrase or written question looks offensive to other forum members an...
by neptronix
May 03 2021 6:03pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

Two suggestions: "Do not make false claims against a vendor." Recommend changing to - do not make false claims against another member. That way people can complain all they like about Microsoft, Trek, Strava etc, and only have that addition burden of validity if they are complaining about...
by neptronix
May 03 2021 5:40pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

What button do I press to indicate that I'm vending? I am not vending ATM but would like to vend in the near future. We do not currently have a system for that, but i do plan to have something like that inside the Xenforo platform once we move to it. Don't worry about openly identifying yourself fo...
by neptronix
May 03 2021 5:38pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

.... I guess this means everyone whom sells any one thing on the forum? As in... everybody? ...'cause I am just a little guy and I could see how this wouldn't apply to me, but may because I do, do so much business. When i say vendor i mean someone who operates a business on a part time or full time...
by neptronix
May 03 2021 5:27pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

In the #1 Basic Rules of conduct, if possible, I'd like to see the word "repeatedly" removed. I would like to grant that request but i think what constitutes insulting and harassing is very subjective depending on the situation, how members feel about things, etc. I don't want the rule to...
by neptronix
Apr 30 2021 12:21pm
Forum: Forum Rules and Features
Topic: The rules of endless sphere.
Replies: 13
Views: 553

Re: The rules of endless sphere.

I will allow an open comment period on these rules for the next couple weeks.