Search found 66 matches

by classicalgas
Sep 14 2020 8:53pm
Forum: E-Vehicles General Discussion
Topic: Delta trikes vs tadpole trikes
Replies: 27
Views: 1541

Re: Delta trikes vs tadpole trikes

For a given height of center of gravity and a given track at the paired wheels, a tadpole will always have better emergency handling(combination heavy breaking and sudden turn) than a delta. With double the contact patch at the braking loaded end, and the braking force vector will usually stay betwe...
by classicalgas
Jul 21 2020 8:25pm
Forum: EBike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 3052

Re: Why fat tires on a street ebike?

"Recumbent buffs sure love to tell fairy tales about how good ‘bents are. If they were even half true, there would be a whole lot more ‘bents, though." You do know that the UCI banned incumbents when they started to dominate bike racing?( in 1934) Roadies like to imagine they are training ...
by classicalgas
Jul 21 2020 8:40am
Forum: EBike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 3052

Re: Why fat tires on a street ebike?

"No, I mean graybeards in the 80s and 90s rode busted, useless recumbents and couldn't admit they sucked,..."

Awww...did wedgie get passed by a graybeard on a 'bent?
by classicalgas
Jul 12 2020 5:32pm
Forum: EBike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 3052

Why fat tires on a street ebike?

From what I can find, areo drag of a typical 4" fatty is around 2-3 times that of even a 2" MTB tire (frontal area twice that of a comfort road wheel/tire combination ) With tire/wheel drag coming second only to the rider in contributing to overall drag, fatties have to use significantly m...
by classicalgas
Sep 29 2019 9:58pm
Forum: EBike Technical
Topic: hacking speed limiter on August Tuesday e-bike?
Replies: 2
Views: 329

Re: hacking speed limiter on August Tuesday e-bike?

36v.

I hadn't thought of that possibility, but it *feels* like the assistance cuts out at about that road speed, independent of what gear I'm in (cadence) It sort of "hunts"...assist kicks in and out as speed drifts up or down around 23-25 mph.
by classicalgas
Sep 19 2019 11:42pm
Forum: EBike Technical
Topic: hacking speed limiter on August Tuesday e-bike?
Replies: 2
Views: 329

hacking speed limiter on August Tuesday e-bike?

I recently picked up an August Tuesday cruiser e-bike (lightly used, at 1/4 retail ) Solid, simple, heavy, with a basic cadence PAS that cuts out the assistance at about 23mph. The bike has a Bafang 350 w rear hub motor, simple mini combination control pad and charge meter, no visible controller, an...
by classicalgas
Jun 08 2019 12:45pm
Forum: EBike General Discussion
Topic: Frame Hole Drilling...
Replies: 36
Views: 2544

Re: Frame Hole Drilling...

"The side covers are attached with rinkydink little screws that have no structural role to play. So structurally, that box is two parallel plates of aluminum. Not what I'd pick to keep the front and rear halves of my bike working as a unit." Those are, at minimum, 5mm screws. Even cheesy C...
by classicalgas
Jun 08 2019 12:11pm
Forum: EBike General Discussion
Topic: Giant cruiser budget build
Replies: 97
Views: 11904

Re: Giant cruiser budget build

" I'm not sure if chrome is quite right yet." I'm a decorative metal fabricator, so I've seen and used range of metal finishes, and I'm not a fan of chrome myself. Some options that occur to me... 1) nickel plating...is softer than crhome, so takes a patina (or can be patinated) to soften ...
by classicalgas
May 26 2019 3:49pm
Forum: EBike General Discussion
Topic: Giant cruiser budget build
Replies: 97
Views: 11904

Re: Giant cruiser budget build

I like it, generally. For a retro headlight, check the thrift stores for a retro goose-neck desk lamp..they often have a hooded bullet head, with vents, that will hold the guts of a rechargeable LED spotlight. I've often wondered if a front hub motor, with appropriate vents and torque arms, could ev...
by classicalgas
May 26 2019 3:07pm
Forum: EBike General Discussion
Topic: Frame Hole Drilling...
Replies: 36
Views: 2544

Re: Frame Hole Drilling...

The above is actually a pretty good chainstay to BB connection...lots of weld area, plenty of torsional stiffness in th e box for a bike that's never going to see a fit rider torque on the pedals. With bolted on side plates, as shown,it's a far better joint, strength wise, than the typical high end ...
by classicalgas
May 25 2019 12:18am
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

"You could have a 1500 watt limit for both and make life a lot easier and simpler for heavy riders, cargo bikes, etc. with little or no impact on safety."...there most definitely would be an impact on safety, the motor and battery allowing 1500w output would be something on the order of si...
by classicalgas
Apr 21 2019 12:16pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

"Not really !...whilst they may have only one “gear”....the ratio between motor rpm and wheel rpm changes dramatically during a run.....thanks to a sacrificial clutch system. Just a different form of variable transmission." That's evading the question. Just because that strategy "work...
by classicalgas
Apr 13 2019 10:57am
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

"Are we talking physics or law?" Both. Good law ( fair, realistic, defensible) is reality based. Double your vehicle speed( to 40 mph) and your kinetic energy (impact damage) is four times what it was at 20 mph "bike" speeds. That means four times the danger to pedestrians, four ...
by classicalgas
Apr 10 2019 9:07pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

"5kw geared to 40mph would be about right since I rarely run above 35mph anyways." That's a motor vehicle by any reasonable definition, not an ebike. Once you hit moped power, you'd better plan on meeting motor vehicle licensing, lighting and brake standards. If not today, soon. Gasbikes s...
by classicalgas
Apr 09 2019 11:04pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

And these guys, who's business is converting ICE vehicles to electric?

https://quantumworks.com/multi-speed-ge ... plication/
by classicalgas
Apr 09 2019 10:20pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

"Anyone who doesn't understand how motors work could easily be confused into thinking it's a good idea, but it doesn't make it a good idea."

So all the companies making and selling mid drives (kits and complete bikes) are "confused" ?
by classicalgas
Apr 07 2019 12:01pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 80
Views: 7053

Re: ICE vs Electric Motor Transmissions

Simply adding power to avoid a multi speed trany isn't a real life option for production ebikes...legal power limits, battery amps/cost, etc.

Evidently ebike manufacturers see a use for gearboxes, I've seen hub drives with two speed tranys, and a rear hub gearmotor with a three speed IGH built in.
by classicalgas
Mar 03 2019 9:24pm
Forum: Battery Technology
Topic: WalMart EverStart Battery Test
Replies: 24
Views: 3831

Re: WalMart EverStart Battery Test

Good stuff, thanks. Evidently my search used the wrong terms.

I don't understand why the massive volume production of boosters and tool packs doesn't result in better tech for the money than home built packs, at least for legal level wattage.
by classicalgas
Mar 03 2019 7:39pm
Forum: Battery Technology
Topic: WalMart EverStart Battery Test
Replies: 24
Views: 3831

jumper box/boost box used as is as pack module?

Can't seem to find any previous mention, anyone tried this?

These are lithium packs with built in bms,10-18 (claimed) Ah at 12-15 v, typically 10a sustained output, much higher peak,rugged enclosures, and cheap. Some extras (lights, device charging ports, charge state readouts...)
by classicalgas
Mar 03 2019 4:36pm
Forum: E-Vehicles General Discussion
Topic: The tipping point is just a few years out
Replies: 81
Views: 6802

Re: The tipping point is just a few years out

"See, you're back to designing people's lives around personal cars, rather than the other way around. Already, folks in real cities are choosing off-hours commutes to avoid being stuck in traffic for with self-defeating shnooks and their self-imposed problems. " That's making the assumptio...
by classicalgas
Feb 13 2019 7:52pm
Forum: EBike General Discussion
Topic: Catrike with Grin All Axle front hub motors
Replies: 30
Views: 5790

Re: Catrike with Grin All Axle front hub motors

"Commercial tadpole trike needs more weight to the rear, it"s too front heavy without any motor. I think they are something like 70/30 from the box. Rear wheel needs all grip it can get, that increases safety. My DIY velo is 35/65." Grip isn't the limiting factor, tipping (up on two w...
by classicalgas
Feb 13 2019 7:32pm
Forum: EBike General Discussion
Topic: E-bike Powered by Tool Batteries?
Replies: 16
Views: 4487

Re: E-bike Powered by Tool Batteries?

This looks like another good reason to consider tool packs for ebikes...an easy to build, cheap (as solar charging goes) and efficient solar charge station for your tool packs..from box store parts (mostly) https://www.greenbuildermedia.com/buildingscience/power-your-jobsite-cordless-tools-with-this...
by classicalgas
Feb 03 2019 2:26pm
Forum: E-Vehicles General Discussion
Topic: The tipping point is just a few years out
Replies: 81
Views: 6802

Re: The tipping point is just a few years out

..."on-demand autonomous electric vehicles owned by fleets"...That futurist is out of touch with the real world. A cheap, older, (possibly electric) car in your driveway is going to stay more useful to most people than a self driving car have to schedule... for a looong time. The focus of ...
by classicalgas
Jan 19 2019 4:51pm
Forum: EBike General Discussion
Topic: Sortimo electric cargo trikes
Replies: 55
Views: 4115

Re: Sortimo electric cargo trikes

"aerodynamics are no better than a TT rider on an upright (the extra wheel doesn't help)"... various charts say a TT bike and tucked rider has about 20% less drag than an upright commuter bike( even without fenders) so that trike is much cleaner than a (non race) upright already That diffe...
by classicalgas
Jan 01 2019 11:46pm
Forum: EBike General Discussion
Topic: Sortimo electric cargo trikes
Replies: 55
Views: 4115

Re: Sortimo electric cargo trikes

"Until you come to a hill, or are pulling away from a stop. Then the "aero" makes you even slower."...and then you more than make it up on the next long flat or downhill where the draggy bike will hit terminal speed. "ALL" high efficiency vehicles put an emphasis on are...