Search found 1318 matches

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: 47714

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...
by Warren
Dec 07 2010 11:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Bill, "I see he was also using a 13/44 combo for a 3.38:1 ratio. Which, if you use the company numbers for no-load rpm, gives him 84.2 rpm at 80%. Right where I would want to be. "Perhaps I should have used a smaller freewheel like you mentioned" Actually, I suggested a bigger chainring, because you...
by Warren
Dec 07 2010 10:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Sturdly, "Dom Harvey had a 48 volt 408 in his BB drive, built about 4 years or so ago now." Wow! He did just what I had suggested. He made a left hand threaded adapter, for a southpaw freewheel. http://www.flickr.com/photos/89372267@N00/134108200/in/set-72057594115596918/ Man, I wish I still had acc...
by Warren
Dec 07 2010 10:12pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Bill, "I'm interested to know where you're getting the no-load 356.4 rpm for a 408 motor." From their website. http://www.crystalyte.com/Mspecs.htm I haven't checked that simulator yet. I would assume the company is using actual measurements, not simulations? But then, I don't understand the amps, a...
by Warren
Dec 07 2010 9:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Bill, Now I am confused. Let us say your friend is using the 409 wind of his motor. The 36 volt no-load speed is 317.9 rpm, so the 80% (most efficient?) speed is 254.3 rpm. With his 16/48 reduction, he would have a cadence of 84.8 rpm...pretty comfortable. For you, 408 wind, 356.4 rpm no-load, 80% i...
by Warren
Dec 07 2010 7:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

mi7d1,

Looks like your reduction is 16/48. According to their spec page, a C408 runs 356.4 rpm on 36 volts, no load. That means your cadence is 95 rpm at 80% of no-load. Am I figuring correctly?

Warren
by Warren
Dec 07 2010 6:25pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

mi7d1, You must be running a internal gear hub in the rear, correct? I can't see how you could spin at 30 mph for 44 miles with that tiny chainring, and a normal 11 tooth cassette high gear in back. I suspect your buddy's Stokemonkey wouldn't do any better than your rig. Hills take a huge amount of ...
by Warren
Dec 04 2010 8:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

"Crystalyte motors now use a reinforced (with steel) central hub area to the threaded connections for freewheels."

Great! Sounds like my problem is solved. Thank you otherDoc.

Warren
by Warren
Dec 02 2010 4:44pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

John,

"I'd much rather spend a short time addressing a known weakness before the motor goes on than repair a failure."

I've never had my hands on one to take apart. How would you go about reinforcing the cover?

Warren
by Warren
Dec 02 2010 4:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

John, "That last config will leave you with the motor force to unscrew the freewheel." The custom I described, with left hand thread, would tend to screw onto the motor under motor power. Under pedal only, it would freewheel, so no tendency to unscrew. Actually, you could use the normal Eno dual spr...
by Warren
Dec 02 2010 11:43am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

jbond, "Where are the freewheels in this config? Does that mean the pedals have to move under motor power?" Yes. But the motor is stationary when pedaling with the power off. This system is designed for bicyclists. It should be bullet-proof. The only inefficiency introduced is that you are gearing t...
by Warren
Dec 02 2010 10:58am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

deVries,

"DD below a No load speed of 280rpm at 39.2V upon special order"

The 48 volt speed would still be a little high.

"cell_man...good prices & can sell the bare motor."

He sounds like a good source. I will check with him.

Thanks
by Warren
Dec 01 2010 9:59am
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

jbond, "One possible solution to this is a small Bafang rear hub motor" Yes. A geared hub motor gets you less weight, and the motor freewheels when you go pedal only...many of the advantages of an Ecospeed style mid-drive, without all of the extra chains and brackets. On the downside, you still get ...
by Warren
Nov 30 2010 10:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Rassy, "you probably are happy spinning faster than I am." My preferred cadence is 75-85. "The nice thing about this type of setup (compared to conventional hub motors), when my cadence feels right I know the motor is also in it's efficient zone." Most Crystalyte hub motors spin 360-460 on 48 volts,...
by Warren
Nov 30 2010 6:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive questions

Rassy, "In 8th gear my trike will only go about 21 MPH, but in 1st gear it will climb a 15 to 20% grade at 6 to 7 MPH with light pedaling and the motor running efficiently (i.e. not lugging and heating up)." So with moderate/heavy pedaling you could hit 25 MPH? That is what I am shooting for with ta...
by Warren
Nov 30 2010 4:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Re: Crystalyte mid-drive

de Vries,

"Those 4x motors with high torque didn't seem enough for me."

It is more than enough for me, as a mid-drive. I am on the low power end of interest in electric bicycles. If I want more power, it will be an Empulse, or something like it. :-)

Warren
by Warren
Nov 30 2010 3:20pm
Forum: E-Bike Non-hub Motor Drives
Topic: Warren's 350 MAC mid-drive (finally) recumbent
Replies: 265
Views: 47714

Warren's 350 MAC mid-drive (finally) recumbent

Folks, This group is an amazing resource. I have been reading this stuff for months. I am an old cyclist. I love long rides by myself...20-100 miles...upright and recumbent. I'm thinking of a highracer with a 48 volt, 20 amp Ping pack. I will pedal all the time...want to average ~20 mph. I really wa...
by Warren
Oct 05 2010 11:49am
Forum: General Discussion
Topic: X-Prize winner sees the light
Replies: 0
Views: 245

X-Prize winner sees the light

Electric light, that is. http://www.readthehook.com/blog/index.php/2010/9/16/kuttner-conquers-olivers-edison2-car-wins-5-million-x-prize Their ethanol powered motors blew up before the end of competition, and the electric winners got almost twice the equivalent mileage. "By Monday morning, September...