Finally RUNNING!! page 5 ride vids Here!! need better qualit

[Whiplash]

Lol! Thanks for the math on how slow I am!

[veloman]

Can you do a no pedal test on an 8% hill?

My 8T mac held 17.5mph up it (230lb rider+bike weight), on 1200watts (battery).

[Whiplash]

I can try to find that exact grade, maybe this weekend ..

[Whiplash]

I was able to find a grade similar to yours, I ran it at about the same speed but used only 900-1000 watts to sustain speed. So it is indeed pretty efficient I suppose!

I also had my nest run today on the way home with the bike on the 11T sprocket I hit 38mph pedaling hard pulling only 1100a watts! So its as fast as my 6T MAC and still climbs like a beast! The motor was lugging a bit so I think ill try a 13T smallest cog and see if I can do the same speed but be easier on the gearbox. The motor itself was cool...

[bzhwindtalker]

Nice! The only drawback to a hub mid drive is that you will not be able to accelerate as fast as à single-speed (without consideration to power). But for the same power input, acceleration will probably be better with the multispeed system, plus you have something like 4x the max torque of an in wheel hubbie, with the motor near peak efficiency all the time

[etard]

I can't believe you are not coming to the races, it's only an hour away for you! Lets see this bike! Don't you want to see how it stacks up? Cmon, you know you do...

[Whiplash]

Im getting close to having some free time, honestly man I would LOVE to go, I just have too much on my plate right now. Life's a bitch sometimes lol! I will make one soon though! Truly though, my bike a climber, not a racer! That will be the next one! I really want to do a cromotor mid drive in a hardtail with like 25AH of at least 20s!! That will be my commuter!!

[Whiplash]

Had a cool ride this morning! I have never before been able to make it to the top of the mountains via HWY74 from palm desert before! The only bike that would do it was my gas bike due to the range. Well today was a personal milestone! I made it all the way to a little group if homes called the Pinion area 12.7 miles frm my house on the valley floor all the way up and around a few trails and back down with grades ranging from an average of 5-7% to a maximum of 13% over the 12.7 miles one way. The best part is I could have gone farther but I needed to get back home for breakfast by the wifey. The motor was barely warm and the controller was actually cold! Lol! I averaged 650watts the whole time but on the steeper grades I pulled around 800. Average speed was around 18mph but a little slower on the steep parts. I could have gone faster but I was trying to hold a comfortable pedal pace and go as far as I could. This is really awesome because there is a bitchen trail ride of over 25 miles mostly downhill from pinion that I really want to ride, looks like with two extra packs of 6s 8AH I can easily make it! Very cool!

https://www.youtube.com/watch?v=lREX-m0 ... ata_player

[waynebergman]

Nice going Whiplash, Awesome!

[stoney]

Anything to report?

[Whiplash]

Still going strong! I have been very busy fixing up a car I bought for the summer here, its far too hot to ride to work now. I basically get to do a morning ride on the weekend if I get up really early, its 100° by 9:00AM so it makes it tough to get motivated. With any luck, ill have my VW Baja bug sold so I can start my design/buildup of my next bike. I am thinking of doing a Timma style build from a nice downhill bike but with a MID drive Cromotor! Should be insane. Looking for more of a high performance build this time, maybe shoot for 50 MPH top speed and still climb really well... lol!

Once it cools off here, ill be back on it! Should be easy to get the basic Trail drive into some sort of production...

[cal3thousand]

Awesome build so far. I'm subscribed hoping you will get a GoPro to flash some actual riding videos.

[Dingo2024]

Hi Whip,
a couple of questions;

what width did you end up with for the hub (ie between the steel collars) after cutting axle / machining etc.

what reduction did you use between motor and cranks.........and whats the cadence like?

thanks,

Ian

[cgbjake]

One of my favorite threads, look forward to your updates and final product. Please keep us informed on how you are doing...and forget about that oil burning machine...ebikes are more important...remember your priorities!

[Whiplash]

THX guys! I am still working on this, just slower during the summer. I am getting ready to try a different cog on the front gearset on the driven side to give me an even lower first gear to try and climb some of the really long and technical very steep grades here. It will hopefully enable me to have the climbing speed j want while going WOT instead of feathering the throttle so it will be less strenuous on the motor/controller.

In other news, a friend of mine got a hi-def CNC plasma cutter recently so I can get the side plates cut easily now! I just need to draw them up and get a set cut!

[MitchJi]

Hi,

Great idea!

Boy! The MAC without the spoke flanges is actually QUITE SMALL for a 3000 watt capable mid drive WITH its own reduction built in! I can't wait to get this kit on the market!

The diameter is down from over 7" to under 6.5" so its considerably smaller..

What did the motor weigh before and after?

Thanks!

[Whiplash]

Finally had decent weather here at least in the early AM to go for the first little ride of the season! Its been terrible weather here lately, last week we had 110* and over 80% humidity!!!! INHUMAN! But the bike was still balanced perfectly after a couple months of storage and rode great! Love this design and can't believe after all my work I finally have a reliable quiet setup! I'm still running the $5 drive chain I stole off a Walmart bike I found on the side of the road! Lol!!

[Powdersummit]

Sounds like everything is working good for you. Need some more videos of the system in action. I'd really like to use a system like this but I'm afraid the MAC may seem out of place and too large for most of the bikes I'm looking at. It would be interesting to see the difference between the MAC, Bafang, Cute motors for performance and how far you could push them in a mid drive. I would imagine the shock on the internal planetary gears would be reduced and therefore you could possibly push a smaller geared hub motor harder.

Carl

[Whiplash]

The loading on the gears is actually dependant on the wind if the motor which will determine the gearing used in the chain line to attain a given speed. I originally had mine geared to go around 45MPH which was way too tall for this motor and I killed the bearings in one of the motor gears. I re did the gearing so it does about 37 now and its been fine ever since. So basically as long as you are not "overdriving" the motor too much you should be fine. I set it up so my tallest gear is slightly higher than the motor would do in the wheel and its been fine...

[waynebergman]

Glad to hear the mid drive is still working good. I plan for a winter mid drive project myself and have a few questions for you.

1.I still can not get my head around the torque transfer stuff. I see the need for a good torque set of torque arms built into the motor mounting but what about after that, do you still have to have drop outs of the bike built up with torque arms? I am guessing not as the standard wheel rear hub is going to be round but just trying to figure out what happens to the transfer of torque back at the frames rear drop outs?

2.I have a mac 10t that will be used for this project so I am running a bit faster of an RPM on the motor end of things and I also hope to go with a Nexus internal rear hub maybe an eight speed. Can you tell me please the tooth count for reductions etc from your threaded fixed gear to the freewheel on the crank and then I can take a guess at what I should be running with my faster wound 10t mac?

3.Are you still recommending the White Eno with the flange from SIC bikes? I don't really know how these items really work but I can figure that out from manufactures data once I know what is best to shop for.

Thanks ..........Wayne

[Whiplash]

Honestly the 10 turn might be the best setup. I am running a 42t crank sprocket driving a 42t sending power back to the cluster which is a 11/34. I am using a 22t mounted on the motor I believe. I would do a 20 or maybe 18t on the motor for you driving a 44t with a 36t feeding the cluster. This is actually a what I want to try since I can't use my 11t because its too tall. I also would like to make it even easier for the motor when climbing because it saves power and I find I don't need even the 10ish MPH I get in first gear so it makes more sense for me..

[waynebergman]

I have been wondering about the axle modification. I guess you had to pull the axle from the hub and then disconnect your phase and hall sensor wires from the motor side of things before cutting your axle and then re solder the wires back in place?

[Whiplash]

I used my lathe and carefully cut just short of through the axle, then snapped it off... Much easier!

[waynebergman]

Did you cut off the Anderson connectors and JST conector or did your motor come with out any connectors on it anyways so you could slip the cut off piece away from the motor? Or did you just cut off the length of axle (on the wire exit side) that had the slot cut into it for wire exit already in it so then the wires would slip through the side of the cut off axle piece?

[Whiplash]

Yes, what you said last..