I've been reading and thinking and designing and machining recently - really looking forward to riding my scooter when finished.
I thought I'd share what I have been up to on here and garner your opinions / advice.
First of all, I'm an Engineer who really has little experience with electric systems so I decided to start a design from scratch. My day job is an Engineering Manager at a luxury car firm in Cheshire.
So, I was given a lovely Turnigy Aerodrive 149kv motor by my good friend Paul Statham (from http://www.easycomposites.co.uk
- if you need carbon fibre and associated materials) and I started to scheme
around that as a starting point.
I've always wanted to have a scooter that is a bit too fast to ride and leaves you gingerly putting it back in the garage wishing that it would behave - so I hope i'm on the right track. The motor seems to be an excellent starting point given the super low 149kv rating, by my reckoning this should mean excellent torque.
My target is to be able to reach 25mph (40kph) with PLENTY of torque to get me there.
After a few beers, and writing numbers into a spreadsheet to help me understand what is going on I cam up with the following specification:
- Turnigy Aerodrive 149kv outrunner motor
- x2 6600mah Li-Po 6S (10C) batteries
- Alien EV ESC Jet 120amp 12s (http://alienpowersystem.com/shop/esc/al ... et-esc-hv/
- 5:1 gear reduction, chain drive (go-ped 52 tooth chain ring)
- Go-ped 6" SRT wheels (complete assemblies directly from Go-ped USA)
I decided to source some go-ped 6" SRT wheels directly from Go-ped USA, the rear wheel has the stand-offs to allow a chain ring to be mounted. I went for these largely because I like the look of them and 6" is about the diameter I am happy with, any bigger and you get the 'offroad' look and any smaller its all a bit skate park for me.
Anyway, I started to design using my increasingly favourite software: Autodesk Fusion 360, if you haven't yet checked this out, get on it NOW. it rivals CATIA for general design (possibly not large assemblies) and has full CAM capability.
I'm machining all of the components myself as I recently bought a Sieg KX3 CNC machine from Arc Eurotrade in Leicester (great guys in there). This project is allowing me to work on my manual skills that would have been fulfilled if I had served an apprenticeship. I would recommend getting a milling machine to anyone by the way.
I'll keep you all posted with more coherent posts but for now, please have a look at a few photos of my progress: