Search found 1342 matches

by Warren
Jan 20 2011 11:17am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

I got my 350 watt MAC front motor, and Infineon controller with 6 (25a) IRFB4110 fets, from cell_man, Paul, the other day. Half way around the world, to my door, in a week and a half. What a world. So now I need a battery pack. It still appears a Ping is my best choice for reasonable weight/price fo...
by Warren
Jan 08 2011 5:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Before I sell the dog for parts, what do you guys think?
Replies: 7
Views: 1003

Re: Before I sell the dog for parts, what do you guys think

Drumlin Bum, "19 tooth sprocket on the gear box to a 72 tooth sprocket on a jack shaft.....After reduction I should get around 100 rpm at the crank." Why not run 19:90? http://www.electricscooterparts.com/images2/SPR-2590.jpg That would get you 80 rpm cadence. That is still only the diameter of a 45...
by Warren
Jan 07 2011 11:11am
Forum: E-Bike Technical
Topic: DIY Torque Arm: A pictorial guide
Replies: 8
Views: 5270

Re: DIY Torque Arm: A pictorial guide

Kingfish, Better than nothing...but not by much. The reaction force is applied to the 90 degree bend in that shelf bracket...the weakest possible use of the metal. You'd be much better off running the torque arm straight up the inside of the fork leg, and securing it with a hose clamp. Lighter, chea...
by Warren
Jan 06 2011 10:38am
Forum: E-Bike Non-hub Motor Drives
Topic: 6X10 Mid Drive Trike
Replies: 74
Views: 28180

Re: 6X10 Mid Drive Trike

jbond, "Stainless steel end covers for BMC and Bafang motors...Perhaps a batch could be made with a wider thread section." If they are made in the EU, it would be cheaper to have a custom one-off made here in the bucolic south. "Perhaps something like this could be mounted on the disk side outside a...
by Warren
Jan 05 2011 1:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: 6X10 Mid Drive Trike
Replies: 74
Views: 28180

Re: 6X10 Mid Drive Trike

jbond, "Cyclone do a dual sprocket version for 'bents and trikes. Has anyone seen one? I'm curious if one or both sprockets have a free wheel and how it's attached to the shaft." http://www.cyclone-tw.com/images/recumbent-s.jpg It has two standard freewheels. The threaded adapter has a shoulder on t...
by Warren
Jan 05 2011 12:20pm
Forum: E-Bike Non-hub Motor Drives
Topic: 6X10 Mid Drive Trike
Replies: 74
Views: 28180

Re: 6X10 Mid Drive Trike

jbond, "See Miche Quick Change Track Cogs and Adaptor...The adapter is pretty narrow," The adapter is exactly as wide as a normal track cog. It is intended to make changing cogs easier for racers, who do so often. It is easier on them because they don't need a chain whip to remove the cog. "and the ...
by Warren
Jan 04 2011 4:23pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Katou, "15-20 wh/mile' Yes. This fits with what I have read. pdf, "What motor/controller did you get?' MAC 350 front motor, and 25 amp Infineon controller with 6 IRFB4110 fets. The recumbent is an old Linear, LWB folder, like this one. http://www.flickr.com/photos/coalandice/2554445056/lightbox/ The...
by Warren
Jan 04 2011 12:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Guys, Thanks for all the great info. I will be riding out in the country on smooth, rolling roads...very few stops. I plan to run it flat out, with a Ping 48 volt, 20 or 30 ah pack, CA set to 15 amps max., shifting to maintain the same cadence. My bike will be lighter, and more aero than a hybrid/ex...
by Warren
Jan 03 2011 3:23pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Bill, "web archive link has the ability for bot metric and "Anglo-american units" Oh! That is handy. Afraid I still think in Anglo units. Doing the conversions is always a hassle. My main question was probably just answered here. http://www.elmoto.net/showthread.php?771-So-what-is-better-for-top-spe...
by Warren
Jan 03 2011 2:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Bill,

"are you familiar with the Bicycle Speed and Power Calculator?"

Yes. Have run numbers on several, but real live experience is always better.

My main question is still, "Is running higher voltage always better for overall efficiency?"

Warren
by Warren
Jan 03 2011 1:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

pdf, "I have my CA current limited to 15 amps so it is not like I'm about to wrench it off with the motor" You are running 36 volts, correct? With a 15 amp max, that is maybe 400 watts coming out of the motor, and another 100 watts from you. What kinds of speeds do you average with that power? A que...
by Warren
Jan 02 2011 2:21am
Forum: E-Bike Reviews & Testing
Topic: StokeMonkey/Xtracycle
Replies: 53
Views: 12954

Re: StokeMonkey/Xtracycle

pdf, "The 2600 miles have not been without (relatively small) problems. I have twice had the battery die at the LVC well before it should and had to send it back to the company where I bought it for repairs each time to have a pouch cell replaced." Now this part of an ebike does concern me. Mechanic...
by Warren
Jan 01 2011 5:22pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Mitch, 'Like a Stokemonkey? Always seemed unsafe to me. If your foot slips off a pedal you have about 3/4 of a second to get it out of the way. Clip-ons would be even worse." I have been riding a tandem bicycle for 14 years. It, like most tandems (but not all) doesn't have a freewheeling crank. A fo...
by Warren
Dec 31 2010 7:13am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

jbond, " I think it should work if you put the fixed sprocket on first and use the freewheel as a locknut.... put a grub screw in the shoulder of the fixed sprocket. Apart from the strength of the hub itself, the big question is whether there's enough thread to get a standard track fixed sprocket an...
by Warren
Dec 29 2010 11:45pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Mitch, > Marcus (Pi Cycle) used standard off the shelf rear (geared, except possibly when he was experimenting with regen) hub motors. I'm sure on his mid drive bikes he had a fixed sprocket between the hub motor and rear hub and a FW sprocket on the hub motor driven by the pedals. He must have used...
by Warren
Dec 29 2010 6:49pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

jbond, > These rear motors typically take a 6 or 7 speed shimano freewheel so there's plenty of width available for two sprockets but the actual screw thread doesn't sound wide enough. Yes. The RH, 1.375" diameter thread is typically no more than 9 mm long. > Looking at those pictures of the fixie g...
by Warren
Dec 28 2010 4:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: WHOOOO HOOOOOOOOOOOOOO!!! No More Slipp!!!
Replies: 19
Views: 1708

Re: WHOOOO HOOOOOOOOOOOOOO!!! No More Slipp!!!

None of you ever skateboard?

Grip tape...skateboard grip tape. Some is paper backed, some plastic backed. Some poor adhesive, some great adhesive.

Warren
by Warren
Dec 28 2010 12:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

jbond, > won't you have to reverse the internal freewheel in the motor? No. Because it will work exactly as it does mounted in a wheel. > Oh. Wait. Crystalite. No.....350 watt MAC. > Do you think there's enough meat on a typical rear hub motor to mount these on the thread? One fixie cog, or one free...
by Warren
Dec 27 2010 11:57am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

Mitch, My concern was not that the threads wouldn't hold up, but that the aluminum threaded portion might break off the cover, as apparently has happened on several different brands of hub motors. The problem has been not a large enough radius between the threaded portion, and the side cover causing...
by Warren
Dec 24 2010 6:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: mid-drive questions

GT and TD, Thanks for the encouragement. I am pretty psyched by this project. Not very exciting for a motorhead. But for a bicyclist to have a stoker as strong as Lance Armstrong, who only weighs 50 pounds, is great! TD, How does the motor manage to keep in sync without hall sensors? I thought that ...
by Warren
Dec 23 2010 3:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: Crystalyte mid-drive questions

Not much interest in my fairly weak mid-drive I guess. But I did sort out than pedelec. One of the power wires from the key switch to the spring loaded contact plunger. The nyloc nut wasn't tight. Resistance was high enough to melt the nylon out of the nut, darken the nut, connector eyelet, and melt...
by Warren
Dec 21 2010 9:44am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

mid-drive questions

Folks, I have been in correspondence with cell_man about a 350 watt, geared, rear, MAC hub motor. It sounds perfect, except for an aluminum threaded freewheel mount. He is checking into availability of the newer version with a steel freewheel mount. This week, I had the "opportunity" to bring home a...
by Warren
Dec 08 2010 10:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: Crystalyte mid-drive questions

Mitch, "Marcus ( http://www.pimobility.com/ ) used to use a drive design similar to the Hanebrink (mid-mounted hub motor). In that application he really preferred geared hub motors." Yes. I read that he dropped the mid-drive to get the price down. Too bad, other than the styling now, it is just like...
by Warren
Dec 08 2010 8:49am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 53870

Re: Crystalyte mid-drive questions

Bill, "I just checked my parts inventory and I have an 18t freewheel and a 60t chain ring. That will get me a 3.33:1 ratio. I'll have to get the e-assist reassembled in the velomobile and give it a try." Sweet! I will be anxious to hear how it goes. It must be nice living where it is not in the 20's...