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FROM THE ANTIPODES, OR THE AUSSIES SPEAK BACK:
I know about Mitch Stott, but Zappia's car was legal weight.
I know our weight limits are different, and we permit screw
blowers and hemi heads, etc, but your cars are (legally) lighter
and have much greater streamlining advantages (in terms of
laid back windscreens, sectioning, narrowing, etc - one guy
here recently imported a Willys coupe Pro Mod and was banned
from using it because the body was illegal).
Dave Cook Australia
Just a minor correction to your article: [Ed. note: It should
be noted for historical purposes that Zappia used a 523 c.i.
Walt Austin Racing Hemi and a screw type supercharger and no
overdrive restrictions while Stott was restricted to a 14-71
conventional rotor Roots 'charger with 24% overdrive.]
TD overdrive is limited to 47% for a Whipple, 108% for a PSI
and 70% for a Roots. Also Stott was only running ~2500 lbs
and had no overdrive restriction at that event, whereas Zappia
was at least 2700lb and that's a big difference (TD is 5.25lb/ci
for a screw blower, at 523ci it's 2745.75lb min).
Since the air in Sydney was over 400', it will be interesting
to see how he goes back in Western Australia as the air here
regularly goes below sea level in Oct/Nov/Dec (it was below
-500' when Victor Bray ran that 245mph pass).
Zappia's a smart cookie and it wouldn't surprise me to see
a 5.8 out of that thing before the end of the oz season, it's
a real beast and now it's going straight on the launch anything
Any 5 is bloody fantastic though in my book!
Hey there, love your stuff, and I know you love information.
Regarding your editorial insert to the John Zappia story,
ANDRA enforce various over drive limits in Doorslammer. 16/71
Rootes can go 70% over; PSI can go 108% over and Whipple can
only go 47% over.
I am told that at 10,000 rpm the PSI is the choice unit,
but up until then, they are all fairly even in their ability
to make good boost. The cars also have a biased weight break
which follows: 5.25 lbs (2.38 kg) per cubic inch or a minimum
of 2700 lbs (1224.7kg), including driver for vehicles using
screw type superchargers; 4.96 lbs (2.25 kg) per cubic inch
or a minimum of 2550 lbs (1156.6kg), including driver for
vehicles using Roots type superchargers.
Keep up the excellent work.