[Land-speed] Bloodhound

[dan warner]

The FIA requires that an automobile, for record purposes, have a minimum of
four wheels in contact with the ground while the vehicle is in the timing
trap.
 
Jack Dolan has mentioned this several times to Franklin while trying to
explain why the Bud Rocket did not set a record.
 
DW


--- On Thu, 7/22/10, Ray Buck <rbuck at xmission.com> wrote:


From: Ray Buck <rbuck at xmission.com>
Subject: Re: [Land-speed] Bloodhound
To: drmayf at mayfco.com
Cc: "LandSpeed list" <land-speed at autox.team.net>
Date: Thursday, July 22, 2010, 2:19 PM


The question of "how many wheels on the ground" has been discussed before and
I'm not sure I ever saw a definitive answer.

If a car is presented with 4 wheels but one (or even 2) of them happens to
lift off the ground during a record run, is the record invalidated?  It might
be seen as somewhat like outrigger (training?) wheels on a bike liner.  Some
may start with 3 or 4 wheels, but at speed only 2 are in contact with the
ground at speed.

Just for the sake of argument, let's say that a car like the Bloodhound which
has 2 front wheels with a much narrower track than the rear, finds itself in a
state where the front wheels are off the ground for a period of time...maybe
100 yards, maybe a mile...???  Would this then invalidate an FIA record?  Or
could someone protest a record if they could show that only the rear wheels we
in contact with the ground?  I think that's what Mayf's alluded to in the last
sentence of his post, and it sure seems like a questionable area to me.

RtR
(gonna be on the salt early for SW to photograph course setup)


On 7/21/2010 3:52 PM, drmayf wrote:
> I am sure that their superior British engineering can come up with power to
over come  nearly double the drag to go from 762 to 1000 mph ( caveat...area
needs to be considered).  Transonic drag is gonna bee a bugger to overcome.
Ever see a transonic drag vs speed curve?  Now if drag is nearly double and it
is likely to be way way more then increased thrust needs will be significant.
I am sure they can do it, however.  I wonder how they are going to over coming
rolling resistance?  That also goes up as some power function of speed.  Going
to be interesting for sure.  I hope they can keep all the tires on the ground
as they set the record. Some manner of objective evidence for that needs to be
developed as the shock wave is going to in all likely  obliterate the track
marks from the wheels.
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