BerkshireEbiker wrote: ↑
Dec 09, 2017 9:00 pm
I'm currently building a new ebike with a drop out of 150mm. I'm looking for a hub motor with around 8000 watts continuous power (not peak)....
Thank you in advance
A rookie here so hopefully this information may be of use to you; I received this week an order of two QS 8oooW 273 50H V3 hub motors w/ two QSKLS96501-8080H controllers. The controllers are fairly sized (a least a foot long or so) w/ serious heatsinks, and the hubs are quite noticeably larger in diameter and wider than typical e-bicycle hubs with some thick wiring cable. The hubs could possibly be used on a wide strong bicycle rim customized with 12g or 10g spokes on a custom built reinforced bicycle frame w/ reinforced dropouts, or to be used on moped and/or motorcycle rims if you can find motorcycle rims that are not made of steel but aluminium [see these big hubs on a couple of Russian's e-bicycles/e-peds that have custom made strong frames that sure don't look like typical bicycle frames but more like moped type strength framing or light dirt bike type framing www.youtube.com/watch?v=h_G6T2JSFNQ ]
. Like Dogman Dan, SlowCo, speedmd, and alan b were telling you, when you are going to run powerful motors more than 5oooW, it's more probable to break 150mm dropouts on bicycle frames unless they are reinforced correctly to handle more power or it's a custom frame. Dogman Dan has a good idea about finding the motors then building the frame to fit since that's what i am already looking to get custom done on my project. And SlowCo's suggestion is a good idea also. I have set of X5404 CrystalLyte motors and they are not as big of course as the QS273's so if you go with 8oooW motors it does make sense like speedmd suggested for sturdy torque arms, maybe doubling them up if you have room and skill to do so w/o causing problems with fitting on disk brakes, also custom frame modifications for reinforcing the sway arms then what is usually available on most bicycles unless you can get a really well made thick titanium tubed bicycle frame using torque arms on that or custom build and/or fabricate your e-bicycle frame with thicker frame tubing etc or reinforce it or using parts from a moped frame etc or something like SlowCo suggested. The "BigBoy" linked below is good example custom frame with strength.
Hopefully these links may be of some use to you with what you asked, in case you are interested;
www.laebike.com/collections/moped-wheel ... -hub-motor
www.dimecitycycles.com/motorcycle-parts ... -rims.html
www.motorbicycling.com/threads/moped-ti ... ims.49183/
And if you want some rigid bicycle rims if you end up going with 5oooW e-hubs, these guys in Germany [Classic-Cycle]
have some good choices for rims and carry other related things and some guys have used their rims on 75ooW applications as shown below.
- They offer 26mm, 67mm rims and 80mm, 82mm, 100mm, 102mm, 132mm wide type fat boy bicycle rims, and some are double-walled not all with also offering as required fat boy tires and other parts etc. Here's one example from the online bicycle store "Classic Cycle" w/ their gallery link below with their 100mm wide double-walled bicycle rims looking like an old cafe racer w/ a little blurb about what they offered [has no pedals for pedalling, so can it still be called a velocipede / e-bi-ke / bi-cycle? doesn't seem so, maybe e-vehicles like the big boy can simply be called an e-cycle (electro-cycle) or bi-ev (my word for 2 wheeled electric vehicle that is non-pedal power) since it uses few bicycle parts]
https://www.classic-cycle.de/en/all/165 ... 19#gallery
-- up to 75oow power / up to 1ookm distance (additional up to 200km) / with 5okm/h cruising speed (road legal) / up to 140km/h possible speed (off road) / weight is 52-56kg (115 lbs)
As for me, i need to find a guy in Toronto who knows how to lace moped/motor rims to e-hubs. If one can't be found to lace these for me locally it will be very frustrating and might have to sell them locally since shipping would be expensive, these are brand new still in the styrofoam which include the powerful controllers with the necessary connectors etc. I've also included a pic of one of the 8oooW 273's i received.
Hopefully some of this was helpful in some way or another.
** Side note, the term velocipede is technically linguistically accurate instead of 'bicycle'.. but of course, there are a strong portion of modern english speaking folks on ES and in the world who don't really care about technical accuracy on such things. **