Search found 201 matches

by v_tach
Feb 04 2010 1:40pm
Forum: General Discussion
Topic: Helmets Part 1,489,348 - To Wear Or Not To Wear
Replies: 625
Views: 29502

Re: HELMETS...?

Amazing load of complete tripe & misinformation from people who normally display a far greater degree of intelligence. Your banging your head against a wall... figuratively speaking. I've been a professional firefighter and paramedic for a couple of decades now and have seen more than my share of b...
by v_tach
Jan 12 2010 12:30am
Forum: General Discussion
Topic: wireless internet problems
Replies: 6
Views: 447

Re: wireless internet problems

firewall software blocking the connection perhaps?
by v_tach
Jan 04 2010 10:37pm
Forum: General Discussion
Topic: Invention idea
Replies: 54
Views: 4472

Re: Invention idea

morph999 wrote: Tesla was doing something like that...
How did that work out for him...
by v_tach
Jan 04 2010 10:32pm
Forum: Battery Technology
Topic: sla question
Replies: 29
Views: 2092

Re: sla question

Let them cool down after use then recharge. No reason to let them sit in a depleted state.
by v_tach
Dec 19 2009 4:38pm
Forum: E-Bike Technical
Topic: Is "LiFePO4" the same as "Lithium Ion"?
Replies: 5
Views: 706

Re: Is "LiFePO4" the same as "Lithium Ion"?

I've heard of LiFePO4 batteries (Lithium-Iron-Phosphate), which have good power capacity and discharge rates, and are safe to use. Also heard of LiPo (Lithium-Polymer), which also have good power and discharge, but tend to catch fire or otherwise go boom in the night. Now I occasionally hear about ...
by v_tach
Dec 08 2009 11:04pm
Forum: General Discussion
Topic: Good alternative to Norton Ghost - computer question
Replies: 15
Views: 1037

Re: Good alternative to Norton Ghost - computer question

Acronis True Image makes an exact duplicate of your hard drive or partitions on a hard drive. That means all files, good or bad.

As far as recommendations previously made, another vote for Acronis True Image from me as well.
by v_tach
Dec 01 2009 9:01pm
Forum: Battery Technology
Topic: Headway 38120S condoms
Replies: 34
Views: 4719

Re: Headway 38120S condoms

olaf-lampe wrote: These springs are not very well conducting, they are stainless steel.

Just my 2 Cents
-Olaf
I've seen beryllium copper Belleville washers used in the aircraft industry. Wouldn't know where to begin to source them though.
by v_tach
Nov 30 2009 9:41pm
Forum: E-Vehicles General Discussion
Topic: New propane goped really green as electric?
Replies: 42
Views: 4817

Re: New propane goped really green as electric?

My local Camping World has refillable 5lb propane tanks.
by v_tach
Nov 23 2009 3:44pm
Forum: Battery Technology
Topic: source for JST connectors (7s packs)?
Replies: 8
Views: 997

Re: source for JST connectors (7s packs)?

The XH series seems to be the most common for balancing taps and is what I ordered.
by v_tach
Nov 22 2009 11:21pm
Forum: Battery Technology
Topic: source for JST connectors (7s packs)?
Replies: 8
Views: 997

Re: source for JST connectors (7s packs)?

I need lenses and good lighting these days. I also have an inexpensive Molex crimp tool that I think will work. If not, I'll do the best I can then solder them to make sure I have a reliable connection. Just gotta keep from deforming the contacts so they still fit the housings correctly. I went with...
by v_tach
Nov 22 2009 10:21pm
Forum: Battery Technology
Topic: source for JST connectors (7s packs)?
Replies: 8
Views: 997

Re: source for JST connectors (7s packs)?

I ended up taking the inexpensive way out and ordered the pins and housings from Digi-Key. I'll be better off with the ability to assemble the leads in the exact particular lengths I need without splicing. I needed a few other tidbits from Digi-Key anyway.

Thanks, K.
by v_tach
Nov 22 2009 9:39pm
Forum: Battery Technology
Topic: source for JST connectors (7s packs)?
Replies: 8
Views: 997

source for JST connectors (7s packs)?

I'm finishing up some 7s LiPo packs and I'm having trouble finding the appropriate 8 conductor JST connectors for making balancing leads. Its easy to find pigtailed connectors for up to 6s packs but accommodating larger packs has been a bit of a challenge. Anyone with any suggestions for a source wh...
by v_tach
Nov 17 2009 9:47pm
Forum: General Discussion
Topic: Helmets Part 1,489,348 - To Wear Or Not To Wear
Replies: 625
Views: 29502

Re: HELMETS...?

For your consideration: Wearing a helmet puts cyclists at risk, suggests research 11 September 2006 Bath, University of Bicyclists who wear protective helmets are more likely to be struck by passing vehicles, new research suggests. Interesting study. Most of the bicycle accidents related injuries I...
by v_tach
Nov 17 2009 2:35am
Forum: General Discussion
Topic: Helmets Part 1,489,348 - To Wear Or Not To Wear
Replies: 625
Views: 29502

Re: HELMETS...?

After reading some of the slobber on the other forum Sheriff Jon mentioned, it was a relief to read what has been posted in this thread. As an professional emergency service provider, I get to see more than my share of the aftermath of many serious accidents. I cant say that bicycle related head inj...
by v_tach
Nov 15 2009 8:26pm
Forum: E-Bike General Discussion
Topic: Create custom parts, products and prototypes
Replies: 7
Views: 736

Re: Create custom parts, products and prototypes

I have my own mill and lathe but I'm not a professional machinist. I have resorted to to the on-line service for parts I thought would be out of my range of limited skills and although not inexpensive, I've been very satisfied. I've also used their laser and water-jet services for a number of differ...
by v_tach
Nov 12 2009 10:08pm
Forum: E-Bike General Discussion
Topic: Create custom parts, products and prototypes
Replies: 7
Views: 736

Re: Create custom parts, products and prototypes

I've been using eMachineShop for years. Can get pretty expensive for one-off parts but very easy and convenient. Had a few parts come back out of spec but they've alway responded very quickly when something needed to be redone.
by v_tach
Nov 10 2009 12:23pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: New Clean Propane Powered Scooter and Fun Kart
Replies: 60
Views: 7702

Re: New Clean Propane Powered Scooter and Fun Kart

As a fuel, I don't think propane is any less noisy than gasoline. Its the lower revving 4-stroke engine that offers a bit of noise reduction compared to the more common higher revving 2-stroke. My generators are no less noisy running on propane. The exhaust smells less noxious but obviously still mu...
by v_tach
Nov 06 2009 2:18pm
Forum: E-Vehicles General Discussion
Topic: New propane goped really green as electric?
Replies: 42
Views: 4817

Re: New propane goped really green as electric?

Living in Florida, we have to deal with hurricanes now and again. Many of us Floridians have emergency electric generators. I converted my emergency generators over to propane several years ago because I got tired of dealing with aging gasoline, stabilizer additives, carburetor rebuilds, and fuel ta...
by v_tach
Nov 01 2009 3:14pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: New Clean Propane Powered Scooter and Fun Kart
Replies: 60
Views: 7702

Re: New Clean Propane Powered Scooter and Fun Kart

For clarification on the electric GoPed ESR... My stock electric GoPed ESR pulls about 27 amps at 20 mph. Its a SLA 24v system so I'm cruising at around 650 watts. The LiPo powered ESR has a slightly higher nominal voltage so motor current is a bit less with even better performance. The controller l...
by v_tach
Oct 30 2009 3:58pm
Forum: E-Bike Technical
Topic: shielding a controller
Replies: 5
Views: 573

Re: shielding a controller

So far I haven't been able to identify where the end goes if I repair. I've closely inspected all the comm segments with a magnifying glass and I haven't found any obvious broken tag end of wire. I also haven't noticed any comm tab with one less wire than any other. I'll keep looking though. With a ...
by v_tach
Oct 30 2009 12:04pm
Forum: E-Bike Technical
Topic: shielding a controller
Replies: 5
Views: 573

Re: shielding a controller

Well, come to find out my motor controller glitching wasn't from interference at all, at least not in the traditional sense of RFI or EMI. I discovered today that I had a bit of electrical continuity between the motor's terminals and the motor can itself. Not normal with a PM motor. I disassembled t...
by v_tach
Oct 28 2009 3:08pm
Forum: Battery Technology
Topic: Elithion
Replies: 1
Views: 335

Elithion

Anyone with experience or information about Elithion (http://www.liionbms.com/)? I noticed a brief single post a while back from Davide Andrea that is listed on the Elithion site as an engineer.
by v_tach
Oct 27 2009 4:01pm
Forum: E-Bike Technical
Topic: shielding a controller
Replies: 5
Views: 573

Re: shielding a controller

I don't know what the existing caps are. They were installed at the factory and are inside the motor between the brushes. I had added 0.1uF caps. One between the - and + , then one from each terminal to the motor can but they didn't seem to help.
by v_tach
Oct 26 2009 8:37pm
Forum: E-Bike Technical
Topic: shielding a controller
Replies: 5
Views: 573

shielding a controller

I've got a scooter controller that is suffering badly from a new motor install. The controller itself does not have it's own case/box and is mounted in very tight quarters inside an aluminum battery tray. I recently swapped motors (installed a more powerful motor) and now the controller stutters and...
by v_tach
Oct 26 2009 1:42pm
Forum: E-Bike Technical
Topic: capacitor identification help please
Replies: 9
Views: 1375

Re: capacitor identification help please

I tried for several hours to identify the cap myself before resorting to posting for help here. I found a very wide variety of markings from manufacturer to manufacturer which made it very confusing for me. However liveforphysics suggestion of using a meter to read the value of the broke cap was gen...