Search found 53 matches

by BalorNG
Apr 10 2021 10:09am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

https://i.imgur.com/ts1fDldh.jpg 20-25 mph wind - just about time to mount a 3d printed 'stabilizer' and go out to ride while allowing the wind to 'broadside' you! The test is passed with flying colors - there is absolutely NO effect of 25+ wind gusts on steering and negligible - on balance, there ...
by BalorNG
Apr 08 2021 2:03am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

Wouldn't a bike that's half the weight or less be a better bike for uphill? why build a heavier one if you have poor power delivery ( creating more of an uphill problem ). There's a lot of recumbent bikes that can hold up to 300lbs out there. I see how movable pieces can be a test bed for ideas and...
by BalorNG
Apr 07 2021 1:05pm
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

Looks pretty dangerous ( in a structural integrity way ), unaerodynamic, insanely heavy, and the opposite of stealthy. Why did you chose to build a bike this way? Because it's an evolutionary design, basically, and test bed for some of my ideas. Plus, I don't weld - I have no facilities. Structural...
by BalorNG
Apr 06 2021 5:00am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

An other ride, this one is quite uneventful. Some telemetry to whoever is interested: https://www.strava.com/activities/5077965007 Power meter data, and logs from all 3 controllers. I've added some flat bonus to power output in addition to 1.5 multiplier, and it feels pretty good now - basically lik...
by BalorNG
Apr 05 2021 2:11am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

fatty wrote:
Apr 04 2021 3:23pm
Per your previous thread, this is exactly the dangerous behemoth deathtrap that's going to get safe and practical ebikes restricted.

This doesn't belong in bike lanes or on public roads.
Hah, so you ARE on a moral crusade. Your demagogy is noted and duly dismissed.
by BalorNG
Apr 04 2021 2:34pm
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

https://i.imgur.com/c7Dead7h.jpg Ok, had one clamp slip on slippery carbon tube (should have thought about it) and ruin my geometry on the second ride, so had to spend almost entire day fixing it . On the plus side that was actually something I've been contemplating for a long time anyway, ehehe. D...
by BalorNG
Apr 03 2021 1:03pm
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

First outing! Just a ride to the garage, using mostly pure 'human powered' mode - no pictures cause helper arrived only in the evening. Worked really well, too well really - the 'power transfer' is a bit 'too' immediate and cases some suspension bob and noise as second motor engages to help the firs...
by BalorNG
Apr 02 2021 2:23am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

Thanks for the reply. Working on a long term project here and was wondering how to join tubes to wheels. Going to eventually build a solar bicycle trailer/camper. Those tube clamps you have elsewhere remind me of hydraulic pipe or Stauff clamps I see on ebay. It's a combination of 3d printed 'pillo...
by BalorNG
Apr 01 2021 5:39am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

Love that no weld philosophy. Works great for us non-welders. Are those bike stems as rear dropouts? How does that work? Are those solid axles, QR or thru-hubs? 12mm through hub, with a 3d printed insert inside the stem. Seem to work, but frankly I need to ask a steel 12mm axle machined, or maybe g...
by BalorNG
Apr 01 2021 5:26am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

Re: LWB recumbent for long trips.

Belt transmission is being fine tuned, 3d printed a huge chainring of carbon filled pla (as well as first stage jackshaft)... should be worth for a few hundreds kilometers hopefully, the weather is not quite rideable due to pouring rain (will order laser cut cogs later) Control signals are routed wi...
by BalorNG
Mar 29 2021 3:59am
Forum: EBike Build Threads
Topic: LWB recumbent for long trips.
Replies: 15
Views: 612

LWB recumbent for long trips.

It took on enough shape that I think it merits a thread. It it a platform to be fully faired, hence some rather unconventional designs choices, like low-trail geometry, steering damper, semi-low seating and LWB form-factor - all according to theory that too much trail and too forward a CP does not b...
by BalorNG
Mar 08 2021 9:49am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

Frankly, I see regen argument is kind of 'sour grapes' one due to complexity of implementing a manual clutch - once you have it, it is an absolute no-brainer. Ahh, you made my day :) I tried to have a similar discussion and I ended up with the same feeling and being kinda discouraged to pursue, des...
by BalorNG
Mar 08 2021 9:09am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

Post up your model in Flow Simulation showing 0.046 at 11m/s. Show us how to fabricate an advanced airfoil without basic fabrication ability, and how to achieve greater than 50% friction regen. This is only half-rhetorical -- I don't think you're being realistic, but I'm also here to learn too, and...
by BalorNG
Mar 08 2021 8:46am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

4080Wh - 3120Wh = 960Wh. It takes you 960Wh extra to lug around 40kg of electrification over 600km (aero). Because, like I said, a conventional velo is out of the question for many reasons, and if am to build diy one, it would drag even more than that! *sigh* Compare DIY, unpowered oranges to clock...
by BalorNG
Mar 07 2021 2:13pm
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

I expect regen efficiency around 85%, that's what actual measured no-load torque and motor resistance tell me, Expect around half that efficiency if you use a friction roller. The more braking power you can apply, the more of it you'll lose to friction and hysteresis. Yea, that's pretty major conce...
by BalorNG
Mar 07 2021 8:52am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

- and I'll be using it intermittenly, that also solves that overheating issue "intermittent" isn't what I would call doing downhill braking. ;) Intermittent would be braking a few seconds here, a few there, with minutes or more in between. Downhill braking of the type I *think* you want t...
by BalorNG
Mar 07 2021 8:42am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

I'm talking about your general conclusion that 'adding a motor to a bike is useless for long trips'. It is most emphatically not - even a simple a motor with an overrunning clutch plus a decent battery will be able to compensate much more than it's weight over VERY long distance, you just need to u...
by BalorNG
Mar 06 2021 6:46pm
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

As for *your* numbers... you don't seem to be as good at them as you seem to be claiming, to be frank. Haha, how do you figure? I calculated based on the very limited information you had provided (mass, velocity, CdA, and distance) -- where was the error? You solved an entirely different problem ba...
by BalorNG
Mar 06 2021 6:36pm
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

I'll have a drone motor powered 'crankdrive' (peaking at about 800w... disregard the huge 'chairing', I've went with a belt) as main source of assist, and likely an other *small* drone motor direct belt drive solution as to seamlessly interface with my pedalling and even out shifting gaps and modul...
by BalorNG
Mar 03 2021 9:23am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

The problem is mostly aesthetic in nature. I *like* cycling. I particularly like cycling in hilly terrain - for the views. But I hate busting my ass uphill. Some people love it. I've never liked it even when I was decently lightweight. It is enough to ruin my enjoyment so much that I just don't find...
by BalorNG
Mar 03 2021 9:09am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

Well, if you want numbers… To start, what is your estimated Wh/km at 40km/h on that 170kg bike? At double your theoretical CdA, you might get down to 6Wh/km. 600km = 3.6kWh. What is your functional threshold? You'd need to hold >175W for 15 hours straight. It's just a problem of scale, and as has b...
by BalorNG
Mar 02 2021 9:56pm
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

I actually did. Multiple times. *sigh* Post your numbers here for accurate advice. Is that a mockup? There's a lot of lower-hanging fruit. GMAC hub motor with locked clutch: no drag and does regen. Well, if you want numbers… 120 kg – my weight (there is some decent leg muscle in there, but I can st...
by BalorNG
Mar 02 2021 5:32am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

Technically, I have plenty of space for the 'swingarm' to swing around and engage the tire from both sides, but that would require a different solution from merely using a brake handle (a servo?) and I'm not comfortable with using a friction drive as source of traction - it's not very efficient and ...
by BalorNG
Mar 02 2021 5:05am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

Various concave rollers have been tried out; I don't remmeber any details. There are a lot of posts/threads about rollers around here; Spinningmagnets probably has them indexed at the top of this forum, if not directly then in one of the other index threads. I don't really understand all of what yo...
by BalorNG
Mar 02 2021 4:53am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 34
Views: 778

Re: Friction *regen brake* sanity check

The solutions for this design goal have been very thoroughly characterized and refined over the last.. century? And they don't include unnecessary braking, but rather aero (especially for down hills), and light weight to ease up hills. This requirement generally doesn't fall within the range of des...