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by The Toecutter
Aug 25 2019 11:15am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I've found a Leafbike motor with a 4T wind laced to a 20" rim available locally. When I get my first paycheck in from my new job, I will be paying a visit to look at it and if everything is good, purchase it without having to wait weeks or months for it to ship from China. I so badly want to put one...
by The Toecutter
Aug 23 2019 6:07pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I sent a bunch of emails to leafbike to try to convince them to produce a motor with 0.27 or 0.2mm lams, and yeah, that's exactly the kind of motor we need for velomobiles, recumbents etc. I didn't get anywhere over the course of a few months. What would help is if some of you could ask them about ...
by The Toecutter
Aug 23 2019 4:54pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Unfortunately leaf does NOT offer the lighter 27mm, so you'd have to go with MXUS or 9C and pray they'll provide you at least a 4T winding. Has the efficiency of these caught up with the Leafbike motor yet? What about hysteresis and cogging losses? A few years ago when I researched these motors I r...
by The Toecutter
Aug 23 2019 3:00pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I bet it would last longer than a minute That would be great news. I'd only need about 20-25 seconds to accelerate to a 90 mph top speed in such a vehicle with that kind of power on tap, and probably wouldn't want to keep at that speed for very long... Really only one way to find out though. Were m...
by The Toecutter
Aug 23 2019 2:24pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

tolkaNo wrote:
Aug 23 2019 12:40pm
My battery is only 18s5p 30q so id probably run out of battery before I could overheat it anyway
I bet you could do it in under a minute if you put 7 kW to it, but you'd probably destroy the battery too.
by The Toecutter
Aug 23 2019 10:41am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Wish i could provide some. My application will be in a 20" wheel in a very aerodynamic ( recumbent ) chassis so whatever result i have won't apply to most folks thinking of using the motor. Those results will apply to my project quite nicely though. :thumb: With the new job I obtained, I'm planning...
by The Toecutter
Aug 23 2019 1:14am
Forum: General Discussion
Topic: Go Cedric!
Replies: 14
Views: 345

Re: Go Cedric!

..Also the comment that Cedric evolved his own math/algebra system to develop the motor and few conventionally trained/educated electrical engineers can understand his (very successful ) methods.! :shock: I've been educated as an engineer, and the reason so few engineers understand what Cedric has ...
by The Toecutter
Aug 23 2019 1:00am
Forum: E-Bike Build Threads / Photos & Video
Topic: Lightweight efficiency oriented BikeE conversion
Replies: 39
Views: 1082

Re: Lightweight efficiency oriented BikeE conversion

Getting a tail fairing by itself to reduce drag is a lot trickier than it looks. You have to consider the entire shape of rider + bike as a complete system, and it will be a constantly changing shape as you are pedaling it. You will need a high end CFD program to model that one. Here's some simple c...
by The Toecutter
Aug 22 2019 11:51pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Any new data on the 1 kW version of this motor, such as what kind of peak power one can reasonably expect from it without destroying it?
by The Toecutter
Aug 01 2019 9:57pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Leaf 1500W now has a cassette version, states that its new on their website, how new I do not know. It's been around for at least five months, but they didn't advertise its availability. I believe the casette version has a 12mm axle on at least one side. I wouldn't recommend buying it, unless they'...
by The Toecutter
Jul 16 2019 12:01am
Forum: E-Bike General Discussion
Topic: First time I'd ever ridden an electric bike
Replies: 4
Views: 417

Re: First time I'd ever ridden an electric bike

Once you ride an ebike, you never want to pedal a regular bicycle again! That is not true in my case. I do prefer the fitness benefits inherent in this. My design will require me to be able to pedal it with the motor disabled, without it being too much more burdensome than it would otherwise be unm...
by The Toecutter
Jul 13 2019 11:14pm
Forum: E-Bike General Discussion
Topic: First time I'd ever ridden an electric bike
Replies: 4
Views: 417

First time I'd ever ridden an electric bike

Today I met a friend who had ordered two front-suspension electric fatbikes. They used Bafang hub motors and cadence sensors, with a twist throttle that had a switch that allows one to choose PAS or throttle operation. I was told the system was 750W. The battery is 48V 13AH. It was a 7 speed in the ...
by The Toecutter
Jul 12 2019 11:31pm
Forum: E-Bike Technical
Topic: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?
Replies: 32
Views: 1590

Re: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?

Vee rubber 2.0 x 20: massive friction, likely due to the BMX/offroad pattern. Lycra dudes blow past me hard. Mitas MC2 2.25 x 20: Better than the above, despite being heavier, likely due to pattern. Lycra dudes blow past me, but not as fast. Hutchinson Spherus 2.25 x 20: This puts me 1:1 with the l...
by The Toecutter
Jun 30 2019 2:16pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

neptronix wrote:
Jun 20 2019 4:36pm

I bought another motor from leafbike recently, a 3T 1000W ( 30mm wide ) hub. Will report on that later.
I'm very curious to hear back with regard to whether or not it is easier to pedal than the 1500W version with the drive system disabled, and if so, by how much.
by The Toecutter
Jun 30 2019 2:01pm
Forum: E-Bike Technical
Topic: velomobile suspension, advice needed. Build thread
Replies: 50
Views: 7263

Re: velomobile suspension, advice needed. Build thread

What would be maximum didn't you can get through bike path gates ? I would like it as wide as I can. My KMX tadpole trike is 39" wide from front wheel to front wheel. There are some bike paths where I only have about 1-2" of clearance on each side of the bollards. I'd recommend going no wider than ...
by The Toecutter
Jun 30 2019 1:51pm
Forum: E-Bike General Discussion
Topic: Deal of the year
Replies: 7
Views: 563

Re: Deal of the year

Was this trike for sale in Missouri by chance? If so, it may have been the same one I saw on craigslist for $250. I'd recommend replacing the stock rims with something of higher quality, or else you will be breaking a lot of spokes. This will require building a new wheel off of the KMX proprietary f...
by The Toecutter
Jun 29 2019 2:13pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Custom KMX recumbent trike with QS205
Replies: 85
Views: 4961

Re: Custom KMX recumbent trike with QS205

adam333 wrote:
Jun 09 2019 9:19pm
Hmm... your power consumption is very high. But again, the trike look fairly heavy.

I would give it a try with slick tire.
From the info Neptronix has provided on these forums, the Mitas MC2 looks like an excellent choice. It is claimed to be low rolling resistance and also rated for 100 km/h.
by The Toecutter
Jun 28 2019 3:24am
Forum: Items for Sale - New
Topic: KMX Trike Front Suspension
Replies: 191
Views: 27890

Re: KMX Trike Front Suspension

The nylock nut most likely have a problem. It should have work even without the loctite. If you have the "K spindle" the replacement bolt is 3/8-16 x 1 1/2" (92949A628 Mcmaster-Carr) If you have the "old spindle" the replacement bolt is 3/8-16 x 1 3/8" (92949A868 Mcmaster-Carr) In both case the nyl...
by The Toecutter
Jun 28 2019 1:04am
Forum: Items for Sale - New
Topic: KMX Trike Front Suspension
Replies: 191
Views: 27890

Re: KMX Trike Front Suspension

One minor problem that I've come across: the bolt that mounts the suspension block to the steering spindle keeps coming loose every 3,000 miles or so. I followed the instructions precisely including use of Loctite, and tightened the nylock nut in all the way with the suspension block flush against t...
by The Toecutter
May 22 2019 8:59pm
Forum: E-Bike Technical
Topic: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?
Replies: 32
Views: 1590

Re: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?

No, and i know they're not going to know. When i switched to the MC2 from the crappy 2.0 vee rubber thing, the watts did climb, but i can't give you an exact figure on how much they climbed. I couldn't get a Crr value for this tire, but I did find figures for a different Vee Rubber tire: https://ww...
by The Toecutter
May 22 2019 8:36pm
Forum: E-Bike Technical
Topic: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?
Replies: 32
Views: 1590

Re: 2019 16" moped/scooter tire pop-off: which is the most puncture proof?

Next up is a Mitas MC2, which was recommended to me by treatland in an email to their sales team. I was told that this had low rolling resistance and that solar vehicle teams loved it. mitas-MC2.jpg This is actually a very impressive tire, and yes... it is hard, so perhaps the low rolling friction ...
by The Toecutter
May 22 2019 8:09pm
Forum: E-Bike General Discussion
Topic: An idea for creating our own tire database
Replies: 9
Views: 616

Re: An idea for creating our own tire database

Yeah a flatless tire would be great, just got a flat today and yet another thorn-proof tube is garbaged as the valve broke. Since we are e-biking, then motorcycle rims, motorcycle tubes and motorcycle tires could be an alternative for some, while motorcycle tires and tubes may fight on a bicycle ri...
by The Toecutter
May 22 2019 4:50pm
Forum: E-Bike General Discussion
Topic: An idea for creating our own tire database
Replies: 9
Views: 616

Re: An idea for creating our own tire database

Also, on the subject of this topic, the following link is VERY useful:

https://www.bicyclerollingresistance.com/
by The Toecutter
May 22 2019 2:10pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I don't know of any specialized hubs for this, but google 'disc brake sprocket adapter' and you will find plenty of goodies. Such as the one below. recumpence also has some very beautiful CNC porn adapters selling for something like ~$80 last time i checked. You have to PM him to get one. Thanks fo...
by The Toecutter
May 21 2019 11:25pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1480
Views: 185952

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

My concern with such a crazy power to weight ratio is that 50kw is enough power to go perhaps >150mph and hitting an uneven surface could send such a light vehicle flying. These things have happened in salt flats speed runs. A valid concern. The gearing options currently available for bicycle compo...