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Posts posted by WI_Hedgehog

  1. Every year new models come out that are noticeably better than last year's models. So if tradition holds, another 4 weeks (about shipping time for some of us) and the new wheels will be out!

    (Or because of trade agreements and COVID nothing innovative will appear until Fall, who knows...) 

  2. It appears the cooling strips (stickers) might be best used as a two full sheets the same width & length as the battery pack, placed on each side of the welded battery pack, directly against the cells, and held in place by the PVC shrink wrap (blue plastic) placed over the cooling material. If a cell were to go critical the sheet would cool the cell and all cells immediately surrounding it in a similar manner as shown in the demonstration video. This cooling effect may stop the chemical reaction in the critical cell, though more importantly should stop surrounding cells from heating to the point of going critical, therefore preventing a chain reaction. 

    Given the nature of lithium cell fires it appears in my humble estimation that anything less will not be effective.

  3. 23 hours ago, meepmeepmayer said:

    So it's 84V because the parts he wants to use are 100V (less than 100.8V) and he wants a margin. Aren't there equivalent ~120V parts or something?

    I believe the highest voltage well-tested board is 100V.

    There is a 150V board under development, but high voltage brings design issues along for the ride.

    With power usage being constant, current generates heat due to losses, voltage does not. However, as Bryan states, pushing components to their limits invites risk of failure, and he wants a larger safety factor.

  4. In 2017 Google moved from watch apps being bundled in the phone APK to stand-alone watch apps. As of March 10, 2021 Google no longer supports bundling. Watches need updates so they load apps on their own, or you have to side-load older apps onto the phone that have the watch "mini-app" packed with the phone app (your mileage may vary on this). This change happened because watches when they were introduced were more like external screens for phones rather than smart devices--more like a "remote control" for the phone. Google wanted "smart" watches to actually be "smart" and run independently of phones instead of being an extension to the phone.

    There is a way to get the watch updated without a factory reset, though it's a bit technical.

    APK: Android application package installer file which contains a bundle of files needed to install the app. Not all files may be needed on all installations, but they're provided so the install goes smoothly using just one APK for all devices.

    Smartphone-smartwatch pairing data is contained in Google Play Services on the smartwatch and is phone-specific. When pairing a new phone the keys are normally wiped through an Android Wear factory reset. The only way to get around this is to instead wipe the key data which allows you to pair Android Wear with a new device, then request the smartwatch’s Bluetooth to be made discoverable via an intent sent through adb, which creates the prompt you see that needs to be accepted. This means your phone can now find your watch (or in this case a different watch interface) and then create new pairing keys with the device.

  5. Many here use AliExpress for parts, others use EUC/EScooter dealers. 

    You will most likely want to check battery voltage with a meter while checking the fault lead (the third wire in the 3-wire plug) on each battery. 

    If you can see that proper power goes to the main board, the fault condition is not triggered, and the board looks good, then check to make sure the power switch works properly; sometimes simple things can create large problems. The switch usually does not fail but it is easy to check. 

    Maybe it is an easy problem to solve, I hope for you that is the case. 

  6. Regarding your side note,

    2 hours ago, Darren0128 said:

    On a side note, I also ran across a 15mm version of the same fan as above, that uses half the power but still has a >10CFM rating...was thinking of hooking up 2 of these in place of the single 20mm stock fan.

    Regarding that...it's hard to test CFM (as most people don't have the equipment to do so), so it can be "generously [over-]rated" without much consequence.

    It takes an ever increasing amount of power to move more air due to pressure differentials, so two 10 CFM fans probably won't move as much air as one 20 CFM fan as they don't have the fan blade surface area (resulting in increased fan body thickness) to build that pressure.

    When sourcing fans I don't look at "Rated CFM" as that's usually exaggerated (and your actual CFM depends on how the fan is used), I look at current draw. The startup draw is what is listed, running current is about 75% of that depending on the application.

    I also source ball-bearing rather than sleeve-bearing fans, they tend to handle the load better and last longer. (mind you this is for tiny electric applications. the opposite is true in larger applications where sleeve bearings coupled with axial thrust bearings support higher speeds though generate more heat and require more lubrication, but it depends on the temperature they're used at.) (read more)

  7. The older 14D models used a fuse like @Scottie888says, the newer ones came with a spare fuse they did not use as it was eliminated from the circuit--fuses eventually blow causing cutout, so they turned out to not be a good idea.

    If you're running a single battery pack make sure it is still putting out voltage, and consider upgrading to dual packs for redundancy which will make your wheel much safer. If you are running dual packs check both.

    There is a fault wire coming from the battery packs that can shut down both packs in the event of failure, detailed in other threads.

    Check the main board for burned parts, any damage should be somewhat obvious.

    The wheel itself is very reliable, the only major concern I'm aware of is the small battery pack aging and not supporting the rider (other than early models having a fuse). 

  8. Technically, charging a warm battery is harder on it than charging at room temperature. "Fast charging" internally heats the battery, and while it can usually dissipate the heat it does cause some additional stress (hence "fast charging" beyond mfg spec). Cells are much more sensitive to charging stress than discharging stress.

    Like @ShanesPlanet says, what's more important though? @Rywokastis extending his battery life, the guys @Tawpiemention need the range. Most people replace their wheels (with faster and farther range models) before they wear out, so no biggie.

    If you're trying to stretch the life (and top speed) of your wheel, take care of it if you can.

    Some people take meticulous care of everything they own (I picture @Rehab1), others have rusting lawn tractors in their front yard (@ShanesPlanet). Yet luck often turns the tables. Maybe in the big picture it doesn't matter. 

  9. Drink & Selfie Stick in the same hand... Also simultaneously riding and flying a camera platform... Sheesh.

    That "no protective gear" thing would bite me like 30 seconds in, just long enough to get the video rolling...kind of like when someone wants some sort of skills demonstration...like @Kuji Rolls demonstrating basic riding for that dancer and...it's all cued up for you, just press Play. 


  10. Just now, shellac said:

    Why is that? Is it different from getting insurance for making say, electric scooters or motorcycles?

    The liability risk is so high due to the difficulty of product usage the category might change from Consumer to Extreme Risk. (As an example I look at how many experienced people here have crashed and had major surgery despite being experienced, cautious, and wearing protective gear.) Marketing a product where injury is expected walks right into the Exclusions clause, so....no coverage. That's speculation, so don't put too much weight on it.

    To address one of @houseofjob's comments, I don't speak Mandarin nor live in China, but do enough business with Chinese companies to know many of the ins & outs he's experienced, because I accept they have a culture different from my own, and respect those differences.


  11. 6 minutes ago, Planemo said:

    LOL, someone on the site will jump at you for posting this, claiming it will make them uncomfortable with it's undertones of racism.

    (which it isn't of course, and I agree with you)

    No, no, that doesn't happen... :laughbounce2:

    Oops, it happened again... :facepalm:

    Brian has quite a few advantages:

    • High-voltage circuits should follow IEEE, CE, RoHS, ISO, ASTM, and CCC standards, which some Gotway boards clearly did not (spacing requirements in particular, referencing @Tawpie's post). Spacing, board material type and thickness, copper trace thickness, layer topology, and solder-blob avoidance also come into play (Gotway blobs... :facepalm: ). In theory Brian has a strong advantage regarding circuit design (we're pretty good at it).
    • Brian's design seems to avoid patent (now owned by Gotway) infringement the same way Veteran does. (Win!)
    • To answer a previous question, spokes can handle incredible abuse, off-road and stunt bikes usually have spoked wheels. (Smart!)
    • I think it's smart to have Adam/WrongWay promo the wheel since he has the equipment & experience to put together a good video (verses Brian trying to create and edit his own video). Plus someone objective is doing the review. (Smart!)
    • Brian has a Facebook page though not an actual website, which might be a blessing at this stage.
    • It's not Brian's first EUC attempt--that's good.

    A lot of things look positive.

    However, even if Brian gets business insurance (required in the US), his production schedule (testing finished Summer of 2021, production manufacturing Fall 2021) seems unrealistic. He would have to set up his assembly facility (already in the works) and hire staff by then, have a business license, employee payroll/insurances/tax deductions...though he may already own a business and intends to ship a limited number of units until he's successful? Don't know.

    Evolution EV is a product by DOMUSA TEKNIK PRODUCTS, but that can be worked around since an oil boiler is a dissimilar product.

    Hopefully Brian makes it happen, then he can be bought out by the Chinese and be rich! :popcorn:

  12. Change the App Display Mode from Windowed (compatibility) to Full Screen:

    +Hold the bottom button to get to the Power_Off/Reboot screen.

    +Tap the top circle so it goes from having a square inside the circle to a full circle (the change is immediate, but you won't see it on that screen). 

    +Press Cancel to return to running apps (the setting is saved). 

    Apps now take up the full screen.

  13. Circuit boards beyond 48V are increasingly difficult to make, 84V is probably a realistic goal. 

    The US is great at using Open Source code, maybe he figured it out. Making the parts for it though, that's a tough one. 

    I can't see a US company getting liability insurance for making wheels, this will most likely be a near impossible hurdle, affording it would be the next. 

  14. 5 hours ago, /Dev/Null said:

    I don't hear much of anything outside my helmet.  I have a very large amount of hearing loss.

    Wireless earbuds. TaoTronics makes some decent ones. 

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