Search found 30 matches

by amos
Sun, 27 Jul 2008, 05:08
Forum: Technical and conversion discussion
Topic: Sprockets...
Replies: 4
Views: 922

Sprockets...

if you struggle to get anything i know of a good gear manufacturer that can probably make one... obviously gonna be costly, but PM if need be...
by amos
Sat, 26 Jul 2008, 06:04
Forum: General EV Discussion
Topic: Car choice - drag coeffiwhatsie?
Replies: 12
Views: 1269

Car choice - drag coeffiwhatsie?

probably cos the "ass end" is super pointy... its replicates an aerofoil... pointy at the end trying to join the two flows back together. After seeing a pic of the car i'm not surprised the Cd is so low..
by amos
Fri, 25 Jul 2008, 19:42
Forum: General EV Discussion
Topic: Israel - The place to be?
Replies: 4
Views: 692

Israel - The place to be?

Hi all, This is a little old as far as "news" goes, however found it posted on another discussion forum and thought it was relevant for here: Thanks to ‘Project Better Place,’ Israel (Not S. Arabia or Iran) is Most Important Mideast Country for Energy (Pt. 1 of 2) Monday, July 14th, 2008 The most im...
by amos
Thu, 24 Jul 2008, 04:38
Forum: General EV Discussion
Topic: ev bike licence
Replies: 6
Views: 1123

ev bike licence

I don't know, but i doubt it... as far as i know the only bike you can ride on the road without a bike license is a 50cc? Which would be the equivalent of XX kW or hp. I'd assume that the ability to ride a bike on the road is limited by the power it delivers. If you're new bike has less power than a...
by amos
Thu, 24 Jul 2008, 04:28
Forum: General EV Discussion
Topic: Formulas and data...
Replies: 3
Views: 569

Formulas and data...

On the units side i can help. A Watt (W) is 1 Joule/Second (J/s) - so power is the amount of energy per second, i.e. rate of energy. 1 Joule = kilogram x metre squared / second squared (kg.m^2/s^2) 1 N = kilogram x metre / second squared (kg.m/s^2) Therefore 1J = 1N.1m, from this 1W = 1N.1m/1s Now t...
by amos
Thu, 24 Jul 2008, 02:12
Forum: General EV Discussion
Topic: importing costs
Replies: 4
Views: 696

importing costs

The warning on this page might help you with the other costs involved:

https://www.zeva.com.au/store.php?product=32
by amos
Thu, 24 Jul 2008, 01:48
Forum: Technical and conversion discussion
Topic: Mirror Removal - Legalities?
Replies: 3
Views: 861

Mirror Removal - Legalities?

I'm certain that mirrors would add to the drag, but to be honest i'd be surprised if the change in Cd would be that great... Obviously it depends on the size and shape of the mirror. The replacement ones on the mini are approx. 100mm x 50mm.. If you take the worst case scenario and assume the mirror...
by amos
Wed, 23 Jul 2008, 04:33
Forum: Technical and conversion discussion
Topic: Loaner tools for AEVA
Replies: 7
Views: 1299

Loaner tools for AEVA

This is brilliant, and good to see that the people on here are actually seeking 1 goal and that is to reduce dependancy on oil. Great stuff - is there an SA office? Some wire crimpers could come in handy when i finally get my project off the ground.
by amos
Tue, 22 Jul 2008, 19:46
Forum: General EV Discussion
Topic: The EV pledge
Replies: 27
Views: 2743

The EV pledge

drowe67 wrote:decided to become ICE-free


Sorry but can't stop thinking about the possible drug references here!!
Image
by amos
Mon, 21 Jul 2008, 00:05
Forum: General EV Discussion
Topic: Car choice - drag coeffiwhatsie?
Replies: 12
Views: 1269

Car choice - drag coeffiwhatsie?

From my mucking around with EV calculators it looks like air resistance only matches rolling resistance at 60mph, and is double rolling resistance at 90mph. Rolling resistance is proportional to weight, and constant for all speeds. Obviously depends on Cd, Af, mass & Coeff of rolling resistance. Wi...
by amos
Sat, 19 Jul 2008, 21:50
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

Yeah you're right Juk... the mini may have a Cd of 0.53, but only a frontal area of around 1.5m^2 - so the product of the two is around .8

A bus for example sake (lets say a Cd of .45) has a frontal area of prob around 4m^2 - product is around 1.9.


by amos
Sat, 19 Jul 2008, 21:01
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

Haakon wrote: Anyone got a wind tunnel handy?


If only! I'd love to do a few things to the mini to see what can be acheived.. maybe i'll have to make a few models up and go talk nicely to my old fluid mechanics lecturer!
by amos
Sat, 19 Jul 2008, 20:23
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

BUGGER!

Cd Mini - roundnose = 0.51
Cd Clubman - slabnose= 0.53

... I was using 0.4 and i thought that might've been conservative!

Well that makes my project a little less economical, maybe i should look at a different donor car myself.

That changes my range from 102km to 90km... damn it!
by amos
Sat, 19 Jul 2008, 20:00
Forum: General EV Discussion
Topic: Motor Adapter
Replies: 5
Views: 721

Motor Adapter

ELECTRIC FSAE?? Good stuff Taffy... good to see that competition is coming into the newer/greener world, wish i'd thought of it when i did the comp in '04! I haven't really followed the comp in the recent past, has there been any other electrics? Or are you on the forefront? UofAdelaide '04 suspensi...
by amos
Sat, 19 Jul 2008, 19:55
Forum: General EV Discussion
Topic: Car choice - drag coeffiwhatsie?
Replies: 12
Views: 1269

Car choice - drag coeffiwhatsie?

Escort Panelvan eh? Well... i'd be surprised if this has a drag coeff. less than 0.35, but it has less frontal area than most other panelvans. It's probably not a BAD choice as far as a conversion goes... plenty of room for batteries (unfortunately they're going change the vehicle dynamics if all th...
by amos
Sat, 19 Jul 2008, 19:35
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

The further the spoiler/wing surface is from the body of the car, the less effective it will be at disrupting the trailing vortices (which travel close to the body), but the more effective it can be at providing downforce (by extending out into the smooth flowing air further from the body). In my o...
by amos
Sat, 19 Jul 2008, 01:46
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

will less frontal area be better than square edges? Well i've a clubman square front... compared to the round fronts i'd be very surprised if there is any difference in Cd at all - the frontal area i'd assume would be about on par as well.. The reason? because most advantages in aerodynamics come f...
by amos
Sat, 19 Jul 2008, 01:19
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

Unfortunately my math is very very ordinary, I understand conceptually what you are trying to do and understand some of the variable but without it written in plain English I am afraid I can’t work it out http://forums.aeva.asn.au/smileys/smiley19.gif Apologies - my mind works with formulas! And i ...
by amos
Fri, 18 Jul 2008, 19:38
Forum: Technical and conversion discussion
Topic: Make your mark on Australia.
Replies: 63
Views: 21064

Make your mark on Australia.

scuzzi wrote: ill try this:-


Image

ok seems to be working ;)

ron.


Nice model there Scuzzi! Solidworks?

Whats the spec.?
by amos
Fri, 18 Jul 2008, 06:43
Forum: General EV Discussion
Topic: First EV
Replies: 31
Views: 2795

First EV

DAMMIT... I just spent about 20 mins doing a post and didn't work... arrrggghhh.. i'll try to summarise.. Welcome EV2go! Not that it means much from me as i've only been here about a week! In that week i've done way too much reading, researching and calculating! So anyway check out this example to g...
by amos
Thu, 17 Jul 2008, 19:53
Forum: General EV Discussion
Topic: Auto trans?
Replies: 14
Views: 1304

Auto trans?

Haakon... i would rethink that respray at the start of the project. Just think how you're going to feel when you have to weld in new brackets or modify anything (for motor mounting or Battery mounting etc) and you're staring at beautiful new paint. Build the project, then strip, paint and re-build. ...
by amos
Wed, 16 Jul 2008, 19:42
Forum: Technical and conversion discussion
Topic: Flexible power coupling?
Replies: 3
Views: 835

Flexible power coupling?

Sorry CometBoy,

I obviously didn't read the question right! Yeah that sucks that Ruland only make up to 1" I would've thought they would make larger...
by amos
Wed, 16 Jul 2008, 05:01
Forum: Technical and conversion discussion
Topic: Flexible power coupling?
Replies: 3
Views: 835

Flexible power coupling?

Do you mean some sort of coupling to overcome slight mis-alignments? Here's one from blackwoods: http://blackwoods.com.au/infoBANKProduct.aspx?SG=2000165&S=10&G=2003391&P=2024109 Or CBC at: http://www.conbear.com/ navigate to the following Product Range / Power Transmission / Shaft Couplings There a...
by amos
Wed, 16 Jul 2008, 04:03
Forum: General EV Discussion
Topic: Overall Initial Calculations
Replies: 20
Views: 2200

Overall Initial Calculations

Good point Priit... that certainly is a significant cost that i hadn't considered. I should revise what i've done anyway as i've only considered the battery costs over the life of the batteries and not included the controller, motor, auxillaries etc. However at least now i'm convinced the project is...
by amos
Tue, 15 Jul 2008, 05:21
Forum: General EV Discussion
Topic: Overall Initial Calculations
Replies: 20
Views: 2200

Overall Initial Calculations

Not sure on what exactly you want the electric motor to be doing in your home (several applications i can think of off the top of my head). To be honest i don't know a lot about the storage of electricity - batteries, capacitors etc. However i do know there are several technologies around the place ...