Search found 391 matches

by Papa
May 27 2008 10:41pm
Forum: E-Bike Technical
Topic: Dissecting the Yi-Yun YK42-3 36v Controller
Replies: 14
Views: 4652

Dissecting the Yi-Yun YK42-3 36v Controller

After receiving my YK42-3 36v Controller, I decided to crack its case, examine and photograph its innards. The first thing I noticed was the FETs. They are F1010E, not the 2SK3435 seen in other YK42-3 units. The pictures for mine, and the FET specs for both can be compared below. I originally planne...
by Papa
May 26 2008 10:03pm
Forum: E-Bike Technical
Topic: Aero e-bike concept
Replies: 35
Views: 7195

Re: Aero e-bike concept

So grab a torch and start making it a reality. The plans are free: http://www.jetrike.com
by Papa
May 25 2008 11:40pm
Forum: E-Bike Technical
Topic: 14.8v @ 6.6a Lithium packs - should I?
Replies: 2
Views: 302

Re: 14.8v @ 6.6a Lithium packs - should I?

Appreciate the direction Link,

He didn't mention how many he had. If more than what I need, i'll certainly PM you the details.
by Papa
May 25 2008 3:11am
Forum: E-Bike Technical
Topic: 14.8v @ 6.6a Lithium packs - should I?
Replies: 2
Views: 302

14.8v @ 6.6a Lithium packs - should I?

I bumped into a guy who has a few, NEW (I won't buy used, period), 14.8v @ 6.6a Lithium packs @ $35 ea. I assume these are Manganese, but could easily be fooled. I'm shooting for 24v initially, so 4 of these would buy me 29.6v @ 13ah for $140. Sound reasonable?...
by Papa
May 25 2008 2:24am
Forum: E-Bike Technical
Topic: a/hr capacity of the DeWalt 36v Lipos?
Replies: 2
Views: 319

Re: a/hr capacity of the DeWalt 36v Lipos?

Gotcha... thanks
by Papa
May 25 2008 1:28am
Forum: E-Bike Technical
Topic: a/hr capacity of the DeWalt 36v Lipos?
Replies: 2
Views: 319

a/hr capacity of the DeWalt 36v Lipos?

Ok,.. I'm either stabbing the wrong keys, or too blind to read the results - searching gets me nada.

So what is the a/hr capacity of the DeWalt 36v Lipos?

Greatly appreciate the guidance.
by Papa
May 24 2008 1:12am
Forum: Battery Technology
Topic: Dry cell peformance?
Replies: 2
Views: 370

Re: Dry cell peformance?

Thanks, Link
by Papa
May 23 2008 10:10pm
Forum: Battery Technology
Topic: Dry cell peformance?
Replies: 2
Views: 370

Dry cell peformance?

I ran across some, what he refers to as, "12v dry cells". They look like typical SLA's. Comments please. The specs are: Capacity - 20ah Constant Discharge Capacity to 10.5v - 30 minutes @ 25a / 5 hrs @ 3.4a Internal resistance - 11 mOhms Life Expectancy (charging 14.7v / 100% DOD 10.5v) - 350 cycles...
by Papa
May 20 2008 11:48pm
Forum: E-Bike General Discussion
Topic: questions on a first build with limited understanding
Replies: 7
Views: 746

Re: questions on a first build with limited understanding

The bike I am building has an average of 25-30 mph without assist on level ground I think you're being a little overly optimistic on your average speed. Even with 'bent condition legs and 100 psi tires, your avarage speed will likely be closer to 15 mph on level ground. With a well designed full fa...
by Papa
May 20 2008 4:32pm
Forum: E-Bike Technical
Topic: Hands off oscillation - what gives?
Replies: 30
Views: 2100

Re: Hands off oscillation - what gives?

I've not saddled a 600 pound, 150hp, FWD bike so I cannot substantiate the bulk of Tony's FWD theory. This does not, however, automatically render the core of his FWD theory inaccurate or false... not by a long shot. To what extent it applies to a 75 pound, 1 hp, FWD bicycle, depends on numerous var...
by Papa
May 20 2008 12:15pm
Forum: E-Bike Technical
Topic: Hands off oscillation - what gives?
Replies: 30
Views: 2100

Re: Hands off oscillation - what gives?

At speeds above about 20mph, steering is done by leaning, not turning. It's both, actually. Steering input is initially required to setup both the direction of the lean, and the desired "lean angle". This initial steering input is necessary for BOTH balancing and navigation. In fact, the direction ...
by Papa
May 20 2008 12:15am
Forum: E-Bike Technical
Topic: Hands off oscillation - what gives?
Replies: 30
Views: 2100

Re: Hands off oscillation - what gives?

All that stuff about steering issues in the above is a total load of bollucks. IMO, it is probably safe to say that the issues Tony Foale raises, impacts lighter, slower, lower wattage vehicles to lesser degree. None-the-less, I believe his knowledge, theorie(s) and pratical experience possess rele...
by Papa
May 19 2008 10:31pm
Forum: E-Bike Technical
Topic: Hands off oscillation - what gives?
Replies: 30
Views: 2100

Re: Hands off oscillation - what gives?

ahend, A thought provoking excerpt from one of Tony Foale's books raises additional concerns about 2WD (or FWD) single track vehicles, primarily motorcycles: (located here: http://www.tonyfoale.com/Articles/2WD_2WS/2WD_2WS.htm ) "To my knowledge very few attempts have ever been made to build 2WD bi...
by Papa
May 19 2008 4:54am
Forum: E-Bike Technical
Topic: Hands off oscillation - what gives?
Replies: 30
Views: 2100

Re: Hands off oscillation - what gives?

... Considering the front end of a bicycle was never designed to propel the frame and rider, could the frame and or fork geometry somehow be responsible? Yes, I believe it is at least partially, if not completely responsible. The following statement is a clue: I went out and rode the bike with no h...
by Papa
May 17 2008 11:42pm
Forum: E-Bike Technical
Topic: Upload Your Circuit Schematics & Requests Here...
Replies: 517
Views: 161793

YK42-3 Schematic Needed please

Schematic needed for a Yi-Yun YK42-3 controller please.
by Papa
May 17 2008 11:16pm
Forum: E-Bike Technical
Topic: Welding a cracked Crystalyte hub - how to?
Replies: 35
Views: 2442

Re: Welding a cracked Crystalyte hub - how to?

I have completed this repair very nicely with 3mm pop rivets and a brace bridge made from a can opener handle...1.5mm strong metal. sadly my camera has gone tits up also Bummer,.. I would've liked to see the repair using .059" thickness stock. How did you manage to thread the spoke through both the...