Search found 131 matches

by madact
Sep 14 2010 1:26am
Forum: E-Bike General Discussion
Topic: How much have you carried on your back!? PICS!
Replies: 3
Views: 291

Re: How much have you carried on your back!? PICS!

Don't have a pic to hand, I'm afraid (it was a while back - a pic was taken but I'm not sure if it still exists, will post if I can find it), but when I got my Antec Solo PC case, I was on a racer with no rack... I tried carrying it under-arm (yes, I have quite long arms) but that got old after abou...
by madact
Sep 06 2010 2:08am
Forum: E-Bike General Discussion
Topic: 8 Week Electric Bike Design Project
Replies: 31
Views: 2226

Re: 8 Week Electric Bike Design Project

Sweet! That really came out looking the part :D, nice job doing this as a vacuum form system too, perfect for medium-size runs.
by madact
Aug 31 2010 11:56pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

The flat spots seem to work much more nicely than the fat angle - the arc is very controllable, so that's one success. Tungsten flat tip.jpeg And I was able to get a 'narrow' fillet (3-4mm) with a slightly convex, somewhat 'stacked' effect easily enough (the spodge on the left was a restart): Narrow...
by madact
Aug 30 2010 9:06am
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

D-Man wrote:Ok, I redid the math above. :arrow: Still, a .87mph gain at 21mph.
Cool, chart validation :mrgreen:... just think, if the chart's right, you could go the velomobile and get another 20mph on top of that :wink: joooiiiinnn uuusssss...
by madact
Aug 30 2010 9:00am
Forum: E-Bike General Discussion
Topic: Thunderbolt tadpole in wood
Replies: 108
Views: 5714

Re: Thunderbolt tadpole in wood

I need either a 20mm axle threaded for a 12mm or larger bolt From experience, a 10mm high-tensile bolt is sufficient (12mm would add a bit of safety margin) - so long as the bolt is long enough for about 20mm of un-threaded shank inside the wheel mount, so the shear stresses aren't concentrated on ...
by madact
Aug 30 2010 7:37am
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

that will help you get that "stack of dimes" you are looking for. Not looking for a stack of dimes so much as I'm looking for a nice strong weld that will save my a$$ if I roll the thing at 110kph... I can do a stack o' dimes at low current, one at a time, and still get insufficient penetration (ev...
by madact
Aug 29 2010 3:24am
Forum: E-Bike General Discussion
Topic: Shimano Total Electric Power System (STEPS)
Replies: 30
Views: 7389

Re: Shimano Total Electric Power System (STEPS)

Ok where are the guys and gals down under at. I would like to request some of the Aussies that have have the cap on wattages to test unit, only catch is that I heard you could buy components separately. If that is true start with real battery and get the hub motor going and give us a review. Shiman...
by madact
Aug 29 2010 1:48am
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

Fair enough, I've ordered some 2.4mm (this was using 1.6mm), I'll probably need some eventually anyway. In the mean time, I'm trying the fatter angle anyway (top is what I was using, bottom is what I'm trying out): Tungsten.jpeg ... and initial results are promising - much tighter arc / smaller weld...
by madact
Aug 28 2010 11:35pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

Well, here's my efforts from this arvo: day 2.jpg Looking a lot better, I think, but I still get this feeling you're going to say it's not up to scratch yet :wink: The pedal and better fit-up helps a lot, no burn-through problems today. I did notice I'm burning the point off the tungsten when the cu...
by madact
Aug 28 2010 8:43pm
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

Looking good - awesome chart, sk8norcal, I'll be saving that :D - looks like the windshield could actually get you down to a Cd 0.7, less than a 'high' recumbent at 0.77 (if a little less comfortable with the crouch, but you look like you can take it :D), that's better than I expected. I suppose I'm...
by madact
Aug 28 2010 8:28pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

That's one thing I do know enough to avoid! I'm certainly not using anything like that on it, but alcohol isn't the only safe way to get a clean surface... I'm removing the galvanisation with hydrochloric acid (1:4 dilution of 300g/L), outdoors in a well ventilated area, rinsing, and drying (I was t...
by madact
Aug 28 2010 9:51am
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

It should be about 1/8" most of the time, if you fit the parts properly. Hmmm, the better beads I was laying today would have been in the 1/8" to 3/16" range... I'll see if I do any better with the pedal Also, make sure you fit the tubes REALLY well, that is another thing with TIG that you may not ...
by madact
Aug 28 2010 4:37am
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

Yeah, played with pulse today, results varied somewhat (it only goes to 25Hz, I tried the 1s on / 1s off 'learner' pulse and 25Hz 30% 60A/20A, which did seem to help keep the bead manageable - but not sure if this was just extra practice helping)... think I might take your advice though Whip, and st...
by madact
Aug 27 2010 1:18am
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

Re: 1800-how's-my-TIGing?

No offense, but keep practicing :mrgreen: Not a bad start though. Yeah, I know... this was done 'free hand' (i.e. work piece in a vice, me standing up, not resting hands on anything) in 30 min of my lunch break (including setting up the welder and packing it all away), I'll see how I go with a bit ...
by madact
Aug 26 2010 11:53pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 1800-how's-my-TIGing?
Replies: 18
Views: 2237

1800-how's-my-TIGing?

Just did a test tigging of a couple of pieces of tube. Semi-destructive testing shows it to be plenty strong, and penetration was OK, but I did get a bit of burn-through and warping, and it's a bit bodgy looking, I was wondering if anyone had some advice on technique (apart from not rushing, this wa...
by madact
Aug 26 2010 10:14pm
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

Ok. I have a another idea. :idea: Maybe it just needs one more mounting point. I've taken my scrap aluminum mistakes and made some braces. Maybe it will be better. Not bolted down yet. My nose will be pretty close to it though. :shock: That looks like it will do a good job of taking out back-and-fo...
by madact
Aug 25 2010 10:46pm
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

D-Man wrote:Thanks. :arrow: I took it off. :arrow: It looks stupid on the bike. :arrow: it weighs 2lbs with hardware. :arrow: How much more metal do I have to add to stabilize it. :arrow: Like stupid.
Ah well, the end of an experiment :(

Never mind, more time to try tail cones, right? :D
by madact
Aug 25 2010 10:35am
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

Thanks for the sketch. The fairing seems to have good left to right support right now, but its just the forward and backward springy tilting motion. I mounted a clamp on the neck of the stem. I could hook the lower part up of the fairing to that. (blue lines) Maybe that would be enough. Or maybe I ...
by madact
Aug 25 2010 10:25am
Forum: E-Bike General Discussion
Topic: Wow! Spokes really can get loose!
Replies: 42
Views: 2586

Re: Wow! Spokes really can get loose!

I can tell you, the hub hangs from the top spokes. Yeah, I know, but as Randall says: someone is wrong on the Internet... http://xkcd.com/386/ :lol: The claim is that "some say they bet that cutting the top spoke is worse for the wheel than cutting the bottom one, but they'd lose that bet and I can...
by madact
Aug 25 2010 8:41am
Forum: E-Bike General Discussion
Topic: Wow! Spokes really can get loose!
Replies: 42
Views: 2586

Re: Wow! Spokes really can get loose!

Hmm, I see what you mean by not much room. I'm guessing John's bike has rims that are designed / drilled for large spoke angles, though it might pay to ask him... Anyway, I just sat down to see if I could work out spoke patterns that could avoid pure radial but also avoid sharp angles, and it can be...
by madact
Aug 24 2010 11:56pm
Forum: E-Bike General Discussion
Topic: Lost your Licence?
Replies: 25
Views: 1210

Re: Lost your Licence?

I'm just under 30, I drink, but I don't drink & drive :| . Don't have a car at this point - could have one on the money I make now (if I sacrificed my various interests), but I'd rather be building stuff than have a car, and when I have the cash to do both (soon) I may well get one, but I'll still b...
by madact
Aug 24 2010 10:30pm
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

These look great, but how does one know that they actually got the right shape? I've seen many fairings, but the only numbers I've ever seen were for full streamliners. Katou It's a windshield, the jury is out on whether it will be an (effective) aerodynamic aid... that said, it'll likely give you ...
by madact
Aug 24 2010 10:40am
Forum: E-Bike General Discussion
Topic: Wow! Spokes really can get loose!
Replies: 42
Views: 2586

Re: Wow! Spokes really can get loose!

Yeah, if the hub is really big and the rim is really small, you could pretty much get away - simply because a given movement at the butt of the spoke will translate to a longer lever arm if the spoke is shorter and the hub larger. Still, the rear wheel from the pic John in CR posted to the WC/2011 t...
by madact
Aug 24 2010 12:38am
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

No videos for me. I'm on dial up. Its too late for that. And I'm almost done. I will test it myself and draw my own conclusions. Thats the best way. Otherwise I'd be sitting at a computer and not tinkering. Thats no fun. If it doesn't work, then I'll be just like everyone else and say "Its good in ...
by madact
Aug 23 2010 10:42pm
Forum: E-Bike General Discussion
Topic: .
Replies: 86
Views: 6126

Re: My Road bike and Ebike Fairings

from what I have read on the hpv mailing list in the 90's, it seems like there wasn't any significant speed advantage with just the front fairing, (It seems also that it works better for recumbents vs uprights) some argue that a tail fairing is more effective.. u probably get better answers on the ...