Slawek second approach- In Pursuit of Silence

[slawek]

That was my first build: http://endless-sphere.com/forums/viewtopic.php?f=28&t=26699

Base on what I have learned during first build and experience from using this bike there is beginning of my second attemption.

Under impression of silence of hub drive, this time I decided to try one stage reduction.
This time my choice was TURNIGY HXT80-85-B (slim and cheap).


For my needs I had to remodel front and back of the motor, and do rewinding (I haven’t done yet, still waiting for magnet wire) from 8 turns to 12 and switch from delta to star to get ~72kV, additionally a want improve air flow.


















I am planning reduction ratio 5:1 and run this thing on 10S2P A123 (20Ah pouch). I will stick to the same controller I used before CC ICE 100. Voltage is a little above rating but my test with 36V show that ICE 100 can handle that, and mosfet 019N04NS used in this ESC are rated for 40V. So I am full of hope that’s going to work.

[def215]

i remember your first build being really damn good. this one looks like it will be even better.

what style of bike will this end up going on?

[acuteaero]

Silence is a lofty goal for an outrunner-powered bike!

This is beautiful work and I am looking forward to seeing the project come together. The attention to detail in your builds is fantastic!

[slawek]

what style of bike will this end up going on?

City commuter - I plan using the same frame from previous build with some modifications.

Silence is a lofty goal for an outrunner-powered bike!

I admit, I exaggerated a little goal , but I will do my best and we will see how it turn out.

[bobc]

Always lovely to see some pukka engineering going on.
An I must say, the RC outrunners are so cheap, it still makes sense to just use them as a source for parts!
The only thing I would suggest is the use of tapered inserts to connect can/shaft/pulley - they WORK & guarantee concentricity (so much better than those little grubscrews).
Keep up the good work!
Bob

[Planky]

I will be watching this closely.

I like the idea of an rc motor but need stealth and reliability for my commute that's why I went hub motor.
I hope you manage to reach your goal of a quiet system!

[ohzee]

Yea props on your first build. Not sure how I missed it until now , but wow you have a unique way of approaching things
and I am very thankful you share as well as you do. Cant wait to see how this works out. Heck id like to see some of the
things you build in your day to day job I bet that is pretty impressive as well.

[RWP]

Your builds are fantastic! Can't wait to see this project progress.

[rojitor]

Genius! Subscribed

[GITech]

WOW, impressive!

I wan't one!

Jay

[Toango]

I like your builds! What does a one stage reduction do? Thinking about silent mid drive too.

[Byte]

Any updates?

[VoKuS]

I really want to see the end result of this!
GO SLAWEK!!!!!!

[slawek]

It won't be that fast, because my boss bought CNC milling machine several weeks ago, and I spend my free time to learn how to use it.