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  1. F

    My RC Mid Drive with Single Stage Reduction

    Looking good! I really like having a throttle for technical stuff and a cruise control switch for long steady climbs. I set the cruise control for 100 to 150 watts, (it varies depending on how fast I pedal). The throttle over-rides the cruise control in case I need a bit of extra power. I...
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    My RC Mid Drive with Single Stage Reduction

    Thanks! Pillow blocks - :lol: :lol: :lol: - Total PITA! I used CAD (Cardboard Aided Design...). Then eyeballing about 50 little cuts on the mill. Cut, fit, re-try. I did put helicopter tape (?) under the mounts, so as to not scar the paint. It's a tight fit, and the top pillow block has...
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    My RC Mid Drive with Single Stage Reduction

    For years I believed a motor freewheel was necessary. I put a lot of thought into freewheel mechanisms. If you take a look at the very first pic in the first post on this thread, you can see a big ol' FREEWHEEL on the left side of the crank, allowing for pedaling past the motor. It was noisy...
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    My RC Mid Drive with Single Stage Reduction

    The 6396 140Kv motor might not be too bad for pedal drag. I've been running 6384's (120Kv) on both of my bikes for a while, and pedal drag is not really noticeable. I like the feel of the lower Kv motors (120-125) as they seem to lug down like a diesel - as I get tired and my cadence slows the...
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    My RC Mid Drive with Single Stage Reduction

    Nice sprocket collection! Just curious, where did you source them? What motor are you using?
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    My RC Mid Drive with Single Stage Reduction

    My primary bike had not been getting much use since I motorized my Reign. So I added a motor to it last December and have been riding it ever since. I have about 35 rides on it now. It's a 2013 Giant Trance 29er, modified to be as close as possible to my Reign. I installed a Reign suspension...
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    My RC Mid Drive with Single Stage Reduction

    My VESC is set to: Motor Current 75 Amp Battery Current 40 Amp (I often see 44+ Amp peaks on the wattmeter after my ride...) MOSFET temp cutoff start 85C (default) MOSFET temp cutoff end 100C (default) But remember, I only use high power for a few seconds... I ran a few tests when I had the...
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    My RC Mid Drive with Single Stage Reduction

    I received the Mystery 6384 motor a while ago. It took about 6 weeks to ship from China. I have 5 rides on it since the end of January. Power: I originally ran the D5035 (orange) motor. I switched to the Turnigy 6374 motor mid last year. The 6374 was a bit stronger (and heavier). The new...
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    My RC Mid Drive with Single Stage Reduction

    What can I say - I'm a sucker for a sexy motor! Do you happen to know the keyway dimensions? (Hopefully 3mm wide...)
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    My RC Mid Drive with Single Stage Reduction

    I borrowed some pics of the Turnigy 6374 from the eSk8 website just for comparison. I think stator volume is probably a reasonable metric to compare motors (assuming other parameters are similar). Here are some rough stator dimensions from my motor spreadsheet. I didn't measure them myself...
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    My RC Mid Drive with Single Stage Reduction

    Nice find! Compared to the Turnigy 6374 130Kv I've been using for a while, it looks like it's only 5% (48gm) heavier and it has about 22% more stator volume. 120KV is a bonus. Did you get it off EBAY? By the way, https://electricscooterparts.com/sprockets25chain-motor.html has a selection...
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    My RC Mid Drive with Single Stage Reduction

    I like the drill planetary. Just curious - can you recommend any specific drill models? Do you know if anyone has taken a drill planetary and mated it to a bike friendly case? What is the typica reduction per stage? Might actually be worth buying a new high end drill just for the motor and...
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    My RC Mid Drive with Single Stage Reduction

    Just for fun, I went here to take a quick look at power requirements. http://www.u.arizona.edu/~sandiway/bike/climb.html That says you would need about 360 watts. However, I believe that is average power for a climb, and assumes perfectly graded and compacted dirt. I also believe that is...
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    My RC Mid Drive with Single Stage Reduction

    Fixvid - Grantmac makes a lot of good points. Designing and developing a proper gear reduction will probably be about an order of magnitude more work/difficulty than a single reduction system. I learned long ago not to build anything that I could just buy. I just took a quick look at the...
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    My RC Mid Drive with Single Stage Reduction

    Your lowest gear is close to my 2nd gear. I can usually climb most hills in second, although lately I'm relying on first gear more often. I climb around 100-200 watts. HOWEVER, if I take my feet off the pedals and try motor only, it falls on its face, even at full throttle. Barely climbs...
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    My RC Mid Drive with Single Stage Reduction

    They allow up to 100 Watt Hours per battery, and I couldn't find any limit on how many you could take. Carry on only. If you get special permission from the airline, you "may" be able to carry on two 150 watt hour batteries. I didn't want to deal with that... I don't remember if you...
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    My RC Mid Drive with Single Stage Reduction

    I found another advantage to a light, low power E-Bike. Last week I traveled from California to Arkansas. There are great trails in Bentonville, so I shipped my bike. https://www.bikeflights.com/ Since the bike is relatively light, the shipping rates were really good. Another 2 pounds and...
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    My RC Mid Drive with Single Stage Reduction

    All six of my motors have sensor cables. Five of them have six wires in the sensor cable, which I believe indicates they have temperature sensors. As I run sensorless FOC, my sensor cable is not connected... My big motors don't get warm to the touch in my normal riding (~150 watts mostly)...
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    My RC Mid Drive with Single Stage Reduction

    A month ago I posted some data on VESC heating vs power. It looked like this put a limit on continuous power. That was using a 4s battery. I was curious to see if changing from 4S to 6S (NO gear ratio change) would improve things. More Voltage and less current... So I ran a quick & dirty...
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    My RC Mid Drive with Single Stage Reduction

    Got it. The VESC 6 does look interesting. Just curious - is this your main transportation or a toy? Are you OK with the time and expense of a development project? So just to fix the math - Tire rollout = 26" * 3.14 /12 = 6.8 feet per rev 6.8 feet per rev *1200 RPM = 8164 feet per minute...
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    My RC Mid Drive with Single Stage Reduction

    What is your goal? A bit of assist to help out on hills and make pedaling a bit easier, or big serious power so you can go FAST? This setup, as currently configured, is useful for just a bit of assist. Like around 150-200 watts continuous and bursts of maybe 500 watts for a few seconds. At...
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    My RC Mid Drive with Single Stage Reduction

    That is nicely integrated! I like the overall looks better than the commercial E-Bikes. Lots of cool little details, like the cover over the motor phase wires. If you made that keyway with a file, you have my respect! Have fun riding!
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    My RC Mid Drive with Single Stage Reduction

    I believe the North Shore spider has both 104 BCD and 64 BCD mounts. This would allow for a 26 or 28 T chainring on the 64 BCD mount, and the Rebel sprocket on the 104 BCD. (Possibly even a 38T and 26T 2x setup and the 90T Rebel sprocket, with an ISCG mount front derailleur, if it all...
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    My RC Mid Drive with Single Stage Reduction

    That's a nice pack. It really blends into the bike. Looks like I need to learn about 18650 cells as an alternative to RC batteries. It seems like the most difficult part is spot welding tabs to the batteries. Do you have a direct mount spider on your crank? Would something like this open up...
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    My RC Mid Drive with Single Stage Reduction

    I've had the Metr working for a while now. The data is very interesting. I implemented the cruise control switch at the same time. The first surprise was that I stop and rest more often than I thought, especially when riding with friends. I was sure we stopped three times on our standard...
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