Energy = Mass X Velocity Squared So.... I think it's actually worse then
you mentioned Dave...
Brad and I were talking about the knock down power of specific bullits
yesterday..... I think the same concept applies....
I used to teach pilots in the Apache that getting rid of the wing stores in
the event of a crash was a critical issue. This allowed you to
substantially decrease the Mass you were going to impact with.... ( wing
stores = rocket pods... aux fuel cells .... Missles and launchers )
Now how this applies... is about like Dave the Hayseed says.... it's more a
function of ability within the class structure... what your car can or
can't have aerodynamicly..... I also think Hp levels dictate ability within
these questions.... if the engine is marginal to push a brick X miles an
hour... then Ballast obviously doesn't cost anything in aero drag at the
bigger speeds but it absolutely costs you in acceleration and rolling
resistence in the begining of the course....and now we have decided that
Weight isn't a good thing to take to the dance in the event of an
accident.... Safety being a critical issue... I need to design into my
bugeye the ability to handle the Ballast.... ( I am sitting here thinking of
frangable fitting's for this ballast.... in other words it's most secure
until an aprubt impact and then flys away from the center of the storm )
Keith ( interesting conversation .... almost as much fun as Cats...LOL )
----- Original Message -----
From: "Dave Dahlgren" <ddahlgren@snet.net>
To: "Keith Turk" <kturk@ala.net>
Cc: <FastmetalBDF@aol.com>; <land-speed@autox.team.net>
Sent: Sunday, June 10, 2001 7:45 AM
Subject: Re: Goodyear tires / Slippage on the Salt
> 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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