seems as the real penalty to ballast is more than just acceleration losses. You
have to stop that pile of pig iron too.. You end up the a parachute that looks
like it belongs on a cargo plane if the lines are sufficient to hold it and even
worse if the car gets out of shape now you have tons of swinging or worse yet
tumbling iron. the strength of the frame and roll cage is as relative to weight
as speed. seems to me that if i had 5000 pounds going 300 mph the forces during
a crash might be similar to 2500 pounds going 600 mph..
hey mayf do these #'s make sense?? seemed to me F=ma applies here.
Dave Dahlgren
Keith Turk wrote:
>
> It's all important and works in relationship to the Torque/HP combination
> you have..... that Fuel motor even with a light load of Nitro makes a ton of
> torque which has a tendency to spin the tires....
>
> Downforce in our car is a function of both the aero package as well as the
> Lead we stick in for Bonneville.... Some folks want the car lighter to
> accelerate as fast as possible and some folks want the car heavier.... ours
> is kinda a balance between the two. Maxton of course requires less weight
> then the Salt ( no Ballast).... even Muroc required a bit more Ballast then
> I had. ( 100 lb's equaled 10mph in my case )
>
> The real key here is Hp and Torque in relationship to your speed..... some
> folks have the luxury of having to much of both....( this was the Case with
> Darrel ) and that allows them to go as fast as the limits of Traction allow.
> In thier case I would run the Maximum Spoiler I could get on the car first
> and then add ballast to get the amount of downforce required. Think about
> it this way.... the Spoiler isn't effective in the lower speed ranges and
> isn't limiting the acceleration.... but it's also not aiding in hooking up
> early... so there is a downside to not adding ballast as well....
>
> The suspension's ability to put this Hp to the Ground is also an issue.... I
> keep thinking hooking up a dirt track car on a straight away is the similiar
> to hooking up a Bonneville car.... Maybe there is something to be gained by
> looking at the small tire classes in Drag racing as well.... Any suspension
> that works in a limited traction situation oughta be interesting to try on
> the salt.....
>
> K
> ----- Original Message -----
> From: <FastmetalBDF@aol.com>
> To: <kturk@ala.net>; <land-speed@autox.team.net>
> Sent: Sunday, June 10, 2001 6:43 AM
> Subject: Goodyear tires / Slippage on the Salt
>
> > Tire slippage was a major problem on every run with the ( too )
> > wide
> > Goodyear Talladegas on the Black Radon Engineering blown fuel altered .
> > Torque output and the downforce at the rear tire contact area
> > ( "patch", footprint ) seem to be pretty much the deciding concerns in
> > whether the car gets hooked up or not ...... salt conditions and judicious
> > use of the throttle are two additional factors that cannot be built into
> any
> > car
> > ....... they are the variable factors that also play into the overall
> picture
> > .
> > Some things in the real world of speed appear to be easy on
> their
> > surface ( pun intended ) ......
> > Doing it is another story .
> > Bruce
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