Formula E regulations

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roddilkes
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Formula E regulations

Post by roddilkes » Sat, 31 Jan 2009, 06:26

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Last edited by roddilkes on Sun, 05 Apr 2009, 20:19, edited 1 time in total.

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acmotor
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Formula E regulations

Post by acmotor » Sat, 31 Jan 2009, 07:21

So from Dicko's mechanical...

1. Any chassis used should conform to FIA specs and be suitable for
   either the local J or S class of Karting (free manufacturer).
2. Tyres should be Dunlop SL1 (hard and durable), this could be changed
   later if more grip is needed.
3. Single rear sprocket drive (free ratios).
4. Solid rear axel.
5. Single rear brake disk (free manufacturer).
6. Front wheel steer only.
7. No suspension systems except the natural chassis flex.
8. Min and Max kart weights to be decided upon later.
9. Open total weight (kart and driver).

and Rod's electrical....
1) maximum voltage limit 72V nominal.
2) Maximum weight of batteries dependent on chemistry.
   ...OR...
   Maximum amp hour capacity.
3) A big red kill switch operable by both driver and externally.
4) battery tie down requirements.



Comments...

We may be advised to stay under 60VDC ? with ripple of regen and initial full charged battery voltage, maybe I can see the reason for 48V nominal being set( 15 x LiPO4 ).
This would still be pushing the 60V limit on full cells / regen.

72V nominal is likely to end up 92V at full charge (22 cells).

We all know that stating a nominal voltage is cheating in the safety area !


Why have any weight limit ? Set a race time limit of 20 minutes maybe.
If you carry more batteries than needed then it will slow you down.
This will be self policing ? You can use any chemistry, any weight but if you can't get around the corner !!
IMHO we don't want to end up with another S.EV.challenge.


Setting a motor model or kW would be more in keeping with the ICE class structure.

Thoughts ?
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acmotor
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Formula E regulations

Post by acmotor » Sat, 31 Jan 2009, 07:29

Remember..... Mark T posted this in ANDRA ANDRA EV rules
Worth a read.
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acmotor
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Formula E regulations

Post by acmotor » Sat, 31 Jan 2009, 21:10

Ok, eating my own words and now trying not to be restrictive.

What if we go with the AS3000 standard of ELV (extra low voltage) and say a max voltage of 120V (ripple free) DC.
This would need to be a max and not a nominal.
e.g. 28 cells of LiFePO4 at 4.2V (max not nominal)
or 8 x lead acid at 15V (max not nominal)

That way we can just sit behind AS3000 and not have to argue (or be liable) for another voltage specification.

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antiscab
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Formula E regulations

Post by antiscab » Sun, 01 Feb 2009, 04:48

or 33 cells at 3.6vpc (which is the terminating charge most manufacturers recommend).

i would agree going with 120vdc absolute maximum.
i would agree with a max total system weight (not dependant on chemistry).

as far as spcifying a max AH, i would suggest making this as max AH that can be used in a race.
that way you *can* have a bigger battery, but cant use more than the xx maximum (ie race is over for you when you reach your AH limit, regardless of whether your batteries can put it out or not).
This way it wont tie you down to a specific format, size or manufacturer of battery.

why a minimum kart weight?

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Formula E regulations

Post by Electrocycle » Sun, 01 Feb 2009, 04:56

minimum weights are the usual way of evening competitors out and not giving too much of an advantage to people with higher budgets who can afford better batteries.

To begin with I think it'd be best just to set a fairly loose specification for the karts and then see what happens.
Adding ballast to already overweight E-Karts won't make them too nice to drive!

Specifying and monitoring Ah usage limits will be pretty painful, and those running higher capacity batteries than they need will already be carrying a weight penalty (and need to use more Ah to carry their extra battery weight!)
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acmotor
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Formula E regulations

Post by acmotor » Sun, 01 Feb 2009, 05:42

Matt, I agree with Electro re the Ah. It would be a nighmare to administer although I see your thinking.

If a motor brand / model was specified for the first wave of eKarts it would control batteries to some extent naturally and would be seen by the Kart world as normal practice given what I see of the standardised ICE motors they use.

I'm cool with min weight as a rule. eKarts will most likely not have to worry about keeping above min weight anyway ! Just make the min weight an easy to meet number.

It seems a good idea to keep as many rules ICE like as it may help breaking into the scene ?

Keep the feedback going so we can lock in some rules for the Formula E.

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roddilkes
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Formula E regulations

Post by roddilkes » Mon, 02 Mar 2009, 19:27

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acmotor
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Formula E regulations

Post by acmotor » Mon, 02 Mar 2009, 21:35

No progress, only homework.
Have looked at some Karts, chassis and complete and yes, the thinking to have both ICE and EV options in the one Kart is what we had though as well.

The other thought was to use 2 x emotors and fit a bearing to the centre of the rear axle so extra power and electronic differential could be experimented with. (maybe thinking too far ahead for now)
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Formula E regulations

Post by Taffy » Tue, 03 Mar 2009, 16:53

You can do something like what we did for the SAE racer, that is a cush drive (this places a shock abosrbing material between the sprocket and the drive line). Saves your drive line from breaking if jam the wheels up.
You dont have alot of room back there if you have a sprocket-motor connection and disc brake as well. Would require some creative solutions. Possible easier to just join both motors togeather then connect to the axle... maybe.

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