Search found 430 matches

by BalorNG
Sep 28 2022 9:51am
Forum: EBike Build Threads
Topic: Something other than a hub or mid drive
Replies: 11
Views: 222

Re: Something other than a hub or mid drive

That's super cool! I take it you're running an ESC? I've always wondered why those small RC motors can be so powerful. My best guess is they can just spin faster and have just denser windings. If you take a typical e-bike direct drive hub motor, rewind it for a much faster wind, use high voltage AN...
by BalorNG
Sep 28 2022 12:03am
Forum: EBike Build Threads
Topic: Something other than a hub or mid drive
Replies: 11
Views: 222

Re: Something other than a hub or mid drive

2.7kw with a custom made 350Wh battery. Made a 2 stage reduction. 3:1 first stage, 5.4:1 second stage. I made the small sprocket removeable so I can swap between 9, 11, and 14 teeth on the fly. Current gearing gives it a 31mph max speed. Done in just over a week. Belt/chain reduction with eboard/RC...
by BalorNG
Sep 27 2022 11:47pm
Forum: EBike Build Threads
Topic: A test mule with virtual pivot steering
Replies: 2
Views: 75

Re: A test mule with virtual pivot steering

Warren wrote:
Sep 27 2022 6:29pm
I would love it if you did a video of the steering mechanism. So does the caster actually vary with displacement from center, by the upper and lower arms following different arcs?
Exactly!
I may do a video later...
by BalorNG
Sep 27 2022 3:22pm
Forum: EBike Build Threads
Topic: A test mule with virtual pivot steering
Replies: 2
Views: 75

A test mule with virtual pivot steering

I've tried creating a very interesting contraption - a virtual pivot steering bike with no had tube (the forks are something to attach bars to), virtually zero 'trail' in 0 deg handlebar position but greatly increasing positive trail when bars are deflected. Zero flop... basically XYZ cargo bike rev...
by BalorNG
Sep 26 2022 4:10pm
Forum: Bike Mechanical & Structural
Topic: Fairings, CG/CP, pneumatic trail and other handling esoterica
Replies: 6
Views: 131

Re: Fairings, CG/CP, pneumatic trail and other handling esoterica

Oh, and this is an other thing I've been thinking about: "The air scoops on the left and right sides at the front of the engine compartment give this air a place to go through the vehicle (pressure to vacuum side) and reduce the pressure/vacuum which tries to slide the tires." https://i.im...
by BalorNG
Sep 26 2022 1:21pm
Forum: Bike Mechanical & Structural
Topic: Fairings, CG/CP, pneumatic trail and other handling esoterica
Replies: 6
Views: 131

Re: Fairings, CG/CP, pneumatic trail and other handling esoterica

Yeah. As much as I love efficiency, I opted for more battery on a bare bike, both times. Riding in close proximity to trucks and SUVs is scary enough, without dealing with gusts. Yea, this is the problem with coroplast streamlining with flat sides. You 'lateral Cd' is that of flat plate, basically...
by BalorNG
Sep 26 2022 1:02pm
Forum: Bike Mechanical & Structural
Topic: Fairings, CG/CP, pneumatic trail and other handling esoterica
Replies: 6
Views: 131

Re: Fairings, CG/CP, pneumatic trail and other handling esoterica

http://www.schultzengineering.us/cross-wind/cross-wind.htm What a great article! Puts my feeble attempts to describe the phenomena to shame I guess. I'll certainly bookmark it. Certainly agree with this bit: Kraig Schultz had this to say about riding in strong side winds: "The problem is wind d...
by BalorNG
Sep 26 2022 6:09am
Forum: Bike Mechanical & Structural
Topic: Fairings, CG/CP, pneumatic trail and other handling esoterica
Replies: 6
Views: 131

Re: Fairings, CG/CP, pneumatic trail and other handling esoterica

Alternatively, if you can shift the balance/streamlining in a way that CG is now HIGHER than CP, it should be possible to have the bike sort of 'blown from under you' (I've actually felt that on upright bike with high-profile wheels) and *automatically assume* leaning into the wind without actual ch...
by BalorNG
Sep 26 2022 6:02am
Forum: Bike Mechanical & Structural
Topic: Fairings, CG/CP, pneumatic trail and other handling esoterica
Replies: 6
Views: 131

Fairings, CG/CP, pneumatic trail and other handling esoterica

Yea, this is mostly about trying to design a more or less fully faired bike - as in singletrack e-assisted HPV that has efficient fairing AND with stable handling in side winds. My goal is to design (or at least try to...) a single-track bike that is more or less 'aerodynamically stable' given aerod...
by BalorNG
Sep 24 2022 10:21am
Forum: Bike Mechanical & Structural
Topic: streamline fairings?
Replies: 24
Views: 449

Re: streamline fairings?

How that is a very interesting solution that is must be effective *and* easy to fabricate without going for composites and hence dealing with PITA of CNCed plugs... Yup. Steve is pretty smart. https://mrbill.homeip.net/albums/powerPursuitBuild/single-image/20140412-DSC05061-photo.html#anchor Cool. ...
by BalorNG
Sep 24 2022 10:19am
Forum: Bike Mechanical & Structural
Topic: streamline fairings?
Replies: 24
Views: 449

Re: streamline fairings?

His final statement in the video does reinforce common recumbent knowledge. Yup. Aerodynamics of recumbents are clearly superior, as is comfort, and crash safety. I ran a Zzipper for one year. Sadly, my pitiful power output meant, what was gained on the flats, was lost on the climbs around here, es...
by BalorNG
Sep 24 2022 10:12am
Forum: Bike Mechanical & Structural
Topic: streamline fairings?
Replies: 24
Views: 449

Re: streamline fairings?

PaPaSteve wrote:
Sep 24 2022 9:26am
Covered front wheel, WindWrap front fairing, coroplast body panels, and spandex.
This bike won 6 criterium races
Cherry-Pie-Race.JPG
How that is a very interesting solution that is must be effective *and* easy to fabricate without going for composites and hence dealing with PITA of CNCed plugs...
by BalorNG
Sep 24 2022 8:31am
Forum: Bike Mechanical & Structural
Topic: streamline fairings?
Replies: 24
Views: 449

Re: streamline fairings?

Motorcycle touring fairings typically increase drag, because they are designed to form a "bubble" for the rider that is larger in frontal area than the unfaired motorcycle and rider. Vetter Windjammer was definitely designed for rider protection/comfort and not aerodynamic improvements. L...
by BalorNG
Sep 23 2022 4:14am
Forum: Bike Mechanical & Structural
Topic: streamline fairings?
Replies: 24
Views: 449

Re: streamline fairings?

Small partial fairings that are inobstructive, light, and do not affect handling are useless aerodynamically. You want at least something like a 'dustbin fairing' - but they were banned for a reason, and funny enough because there were 'front only'. You want a balanced front and rear fairing. Heck, ...
by BalorNG
Sep 18 2022 1:24pm
Forum: Bike Mechanical & Structural
Topic: ? These must be junk
Replies: 5
Views: 464

Re: ? These must be junk

Nope, likely quite good enough. Just out of fashion - no axles, disk brakes and does not fit larger tires.
You chances of getting a lemon are likely a bit higher than something from name brand, but not by much.
by BalorNG
Sep 16 2022 6:36am
Forum: EBike General Discussion
Topic: Mid drive front freewheel mod.
Replies: 41
Views: 1082

Re: Mid drive front freewheel mod.

But... why? What can it possibly accomplish? You still cannot shift while stationary, I mean.
by BalorNG
Sep 10 2022 1:52am
Forum: EBike General Discussion
Topic: Pedaling at high speed
Replies: 108
Views: 3105

Re: Pedaling at high speed

Please know and I know you do, you can turn the weight gain around...just like the science of riding, the science of diet, intermittent fasting, more ketosis, less sugar, fewer carbs breaking down insulin resistance, you can melt that all away. A simple matter of training the body to consume its fa...
by BalorNG
Sep 09 2022 11:04am
Forum: EBike General Discussion
Topic: Pedaling at high speed
Replies: 108
Views: 3105

Re: Pedaling at high speed

I like to train with elite cyclists only me to lower watts with a motor. They are my friends and we have a lot of laughs talking about speed and power on the bike, training techniques etc. I am a bit of a curiosity to them because I am one of the few to 'cross over'. I have a very diverse backgroun...
by BalorNG
Sep 09 2022 9:57am
Forum: EBike Technical
Topic: Bike Range - DD VS. Geared Hub
Replies: 25
Views: 497

Re: Bike Range - DD VS. Geared Hub

How about a DD WITH middrive? How about two middrives, one left-sided (RC single stage reduction), and one right-sided (conventional crank drive)? :) You can have both for half the weight of a DD wheel, and get very low unsprung weight, high efficiency (and power!) at high speed cruise AND stump-pul...
by BalorNG
Sep 09 2022 8:07am
Forum: EBike General Discussion
Topic: Pedaling at high speed
Replies: 108
Views: 3105

Re: Pedaling at high speed

First as you pointed out, I didn't speak to maximum cadence and did obliquely touch up how physiology relates to cadence as a broad stereotype, but...what you stated about intransigent nature of people stuck with their 'natural' cadence isn't true. You may now nitpick that you didn't say that eithe...
by BalorNG
Sep 09 2022 2:27am
Forum: EBike General Discussion
Topic: Pedaling at high speed
Replies: 108
Views: 3105

Re: Pedaling at high speed

He should get a faster bike where human pedaling matters...lol. You made a blanket statement and you were wrong. I routinely have top cyclists in my town draft me at 35mph + and I am contributing over 300w to the pedals. I have a FTP, functional threshold power of 275 watts and can easily sustain o...
by BalorNG
Sep 08 2022 2:51pm
Forum: EBike General Discussion
Topic: Pedaling at high speed
Replies: 108
Views: 3105

Re: Pedaling at high speed

Just as long as you understand that pedaling at 35 mph and over slows you down and costs you range due to the extra aero drag exceeding your pedal power. It might help you maintain the illusion of "bicycle", but it doesn't help. You forgot that humans aren't created equally. I didn't forg...
by BalorNG
Sep 06 2022 2:54am
Forum: Motor Technology
Topic: How to get a low voltage, high current controller?
Replies: 3
Views: 284

Re: How to get a low voltage, high current controller?

Yup, I've been using it for some time, those are not 'explody' unless you try to push volts very close to maximum and/or do regen braking. Not terribly cheap, but actually is for what you are getting actually.
by BalorNG
Sep 01 2022 9:19am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 421
Views: 31876

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

You want to use it with this (about 110A max) ESC in particular? Than it's a perfectly valid reason I guess. If max current at 180KV is 150A, than at half the KV it will take half the current before saturation... I’m not particular about the esc. I’m trying to match the esc to the motor’s max abili...
by BalorNG
Sep 01 2022 2:37am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 421
Views: 31876

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

I don’t think anyone here is saying u can get more torque out of low kv. It’s all the same heat to torque, but when u lower the kv u are more able to get to that max torque. No higher current esc needed. The magnets are high temp n42sh I believe. I’m not worried about them and just trying to figure...