Begin forwarded message:
> From: Jane McMeekin <mcmeekin@columbus.rr.com>
> Date: June 10, 2007 6:00:54 PM GMT-04:00
> To: Dick J <lsr_man@yahoo.com>
> Subject: Re: [Land-speed] Downforce vs Ballast Question
>
> Dick,
> We just finished aero testing on the 240sx and discovered some
> stuff that was not anticipated. For instance, we added a 3/8"
> wicker bill to rear spoiler and experienced an additional drag
> factor of 5+ hp (+.005cd), but at the same time, went from 230lbs
> lift, at 200mph, to a lift of 91lbs with this change. As you can
> see the trade off in drag for down force is very favorable with
> this modification. The point is, it's not an easy call in many
> instances and may be even be more difficult without scientific
> data. What ever you decide to do, my advice is to pay attention to
> developing the best possible shape, while at the same time, take
> advantage of low penalty aero tricks that aid in the development of
> down force at a reasonable cost in additional drag.
> Don
> On Jun 10, 2007, at 3:30 PM, Dick J wrote:
>
>> Which is better? It would seem that if you add, say 500 pounds of
>> ballast, it's a simple addition. If you add a spoiler designed to
>> add 500 pounds of downforce, then you are adding the effective
>> weight, plus additional drag. No?
>>
>> DickJ
>> In East Texas
>>
>>
>> ---------------------------------
>> No need to miss a message. Get email on-the-go
>> with Yahoo! Mail for Mobile. Get started.
>> _______________________________________________
>> mcmeekin@columbus.rr.com
>>
>> Land-speed mailing list
>>
>> http://autox.team.net/mailman/listinfo/land-speed
_______________________________________________
Land-speed mailing list
http://autox.team.net/mailman/listinfo/land-speed
|