Search found 594 matches

by tahustvedt
Aug 10 2016 11:00am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I didn't know about the Samagaga diffs. They look nice. I want to make as much as possible myself, it's part of the fun for me. :)
by tahustvedt
Aug 10 2016 7:29am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

The old velo will be the winter velo because it has very good suspension. The new velo will only have about 40 mm of suspension travel. Maybe 50.
by tahustvedt
Aug 10 2016 6:37am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

It will be monocoque. The routed pockets will be on the inside. There will be a central structure to mount the seat and driveline to, and carbon fiber strengtheners. I will make a differential using angle grinder gears. Two large and four small gears. http://www.ebay.com/itm/231059208016?_trksid=p20...
by tahustvedt
Aug 09 2016 1:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

Probably hinged in the front. I hope I can make it rigid enough to not flop about too much. It will have some carbon fiber tubing structure where the round shape is in the middle of the canopy. a 50 mm diameter tube across inside. I plan to mount mirrors on the outside there and the GPS mount onthe ...
by tahustvedt
Aug 09 2016 10:52am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

The old one is a bit oversize. Something that is really hard to discover on a computer screen. the internal width and height is enough for a very large person, which I am not. Turning radius will be adequate. The track is wider than other fast velomobiles, at 720 mm, but the CG will also abe a bit h...
by tahustvedt
Aug 09 2016 7:18am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I found some nice plywood wall panels with some kind of coating on both sides. I think I will use that. Most of the material will end up in the bin as chips and dust.

The picture shows new vs old.
by tahustvedt
Aug 07 2016 5:56am
Forum: E-Bike Technical
Topic: Guy adds unusual rear brake to cruiser frame.
Replies: 13
Views: 979

Re: Guy adds unusual rear brake to cruiser frame.

O-ring chains probably have a ton of extra friction.
by tahustvedt
Aug 06 2016 10:51am
Forum: E-Bike Technical
Topic: Guy adds unusual rear brake to cruiser frame.
Replies: 13
Views: 979

Re: Guy adds unusual rear brake to cruiser frame.

Cool setup. Oiling the chain is going to be difficult without contaminating the pads. Maybe he removes the chain for servicing.
by tahustvedt
Aug 06 2016 8:37am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I run at night. Wish it had batch running though so that I could run several simulations. Tonight I'm going to run a slightly more refined model of my new velomobile.
by tahustvedt
Aug 05 2016 7:58am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

On the highest stability setting it usually takes 7 hour 30 minutes to complete. It'll be faster if you have a CUDA graphics adapter with more than 1,5 GB ram.
by tahustvedt
Aug 05 2016 6:38am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I ran a test with a tiny spoiler under the tail last night. It reduced the drag by 3 W. Not significant. I'll try with fairings over the suspension arms next.
by tahustvedt
Aug 05 2016 6:04am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

Drag increases square with the velocity, but not square with changes in frontal area. ;) My Elf 3D model has no side doors, so it does take in account the extra drag of pulling along a second frontal area f the rear of the cabin. It's not a perfectly accurate model if the Elf, but it does give a bal...
by tahustvedt
Aug 04 2016 9:02am
Forum: E-Bike Build Threads / Photos & Video
Topic: Amazing build on youtube
Replies: 6
Views: 1121

Re: Amazing build on youtube

Nice looking bike. Those saddlebags look like they definitely will interfere with the feet though.
by tahustvedt
Aug 04 2016 7:24am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

My Elf model takes 845 W aerodynamically at 40 km/h.
The Quest model takes 117 W.
by tahustvedt
Aug 04 2016 5:24am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I thought the drag from the old tests were way too high compared to how it felt so I ran a new test with an updated model. 341 W @ 40 km/h. This is close to how it feels to pedal at 40. I have two bikes with power meters so I have a lot of experience with reading my power output. Oh, and guess what ...
by tahustvedt
Jul 31 2016 4:51am
Forum: E-Bike Build Threads / Photos & Video
Topic: My Velo Pedal Car Prototype
Replies: 64
Views: 6437

Re: My Velo Pedal Car Prototype

I have used the same levers since the beginning, but they are road time trial levers, which have a shorter cable pull than mtb levers so they need road calipers to work well. In the end the difference in braking force between the calipers was tiny though. What really made a difference was when I rep...
by tahustvedt
Jul 31 2016 4:45am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I will probably just start on the new one before making the pneumatic stuff. I have all the parts I need for the pneumatics, but lost interest. The attached drawing shows the new vs the old outline. I think the windshield will be fine. I can see forward out the side windows of my old velo. The other...
by tahustvedt
Jul 30 2016 1:01pm
Forum: E-Bike Build Threads / Photos & Video
Topic: My Velo Pedal Car Prototype
Replies: 64
Views: 6437

Re: My Velo Pedal Car Prototype

BTW. I have a charger installed in my velomobile and just plug in a regular computer power cable in the rear to charge through the BMS charge wire. Super easy. The solar panel also charges whenever the sun is shining on it and the battery isn't already full.
by tahustvedt
Jul 30 2016 8:03am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

Turns out the boxy profile is the best. 140 W at 40 km/h is pretty good. It has the best visibility and is easier to build as well.
by tahustvedt
Jul 30 2016 7:30am
Forum: E-Bike Build Threads / Photos & Video
Topic: My Velo Pedal Car Prototype
Replies: 64
Views: 6437

Re: My Velo Pedal Car Prototype

I have BB7 road calipers on the front and a cheap chinese on the back. I had the same chinese on the front first but replaced because I needed road calipers to work well with my levers. To be honest there was no difference in braking strength. I think I would get these for the front on my next velom...
by tahustvedt
Jul 27 2016 6:13am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

Acrylic og PET, whichever I can find. BRakes wil be 203 mm discs.
by tahustvedt
Jul 26 2016 4:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I might try a run of the old velomobile with a little spoiler on the bottom of the tail. It could be interesting.
by tahustvedt
Jul 26 2016 11:01am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

I think I'll run another test of the old velo one night as it seems a bit high. :P
by tahustvedt
Jul 26 2016 10:54am
Forum: E-Bike Non-hub Motor Drives
Topic: Project: Home made velomobile design with crank or mid motor
Replies: 338
Views: 70192

Re: Project: Home made velomobile design with crank or mid m

The exposed wheels create a hell of a lot of drag, and you're right about the rear. There's a low pressure area under the rear end of the old one, and the total is a strong downforce on the velomobile, which probably wastes a lot of energy. It produces a bit more downforce than drag. The new shape b...