Thursday, 21 June 2007 16:03

Booth, Bob - Bob Booth Special

Written by  Martin Stubbs
Racing Austin 7 Histories
 Bob Booth Special
 
 Series: 2/2 07/05/07 Text & Photos: Martin Stubbs
   

 
 
 
 
 
Austin 7 racing enthusiasts are lucky in Australia, and in
particular,in Victoria where we have a range of expert automotive
engineers who have been involved in the building Austin 7s racing
cars for local and overseas challenges for many years. Bob Booth
along with Bill Morling and Jim Wilde were responsible for the design
and construction of three of the 1981 ‘Raid’ cars for Tony Johns,
Graeme Steinfort and Max Foster. Richard Stanley built the bodies
using a photo of a Grand Prix Bugatti on a workshop wall, as the
inspiration for their final shape. These cars and two others went over
to the UK and “set the cat amongst the pigeons” as they say but that
is another story.
So when any of us hear that someone is building another racing car,
our interest is immediately aroused as to what form the new car will
take.

Although I originally conceived this ‘series’ as articles about older
cars, I now feel that this could be some what limiting and that visitors
to ‘Motormarques’ will forgive me for a occasional deviation.

My need to have some machining done on a brake drum was an
opportunity to visit Bob at his workshop and view progress on his
new creation.

Conceived purely as a single-seat sprint car with the general
appearance of the 1933 ‘Jamieson’ side-valve, it is very much a
synthesis of Bob’s many years of engineering experience, which
is being carried out to the highest standards of workmanship
and skill.
DESIGN DETAILS

Engine: Angled to align with off-set drive. Crankcase, 3-bearing
type with force fed 3 bearing crankshaft. 1937 cylinder head with
‘Yamaha’ valves. 3/8 ‘Nippy’ camshaft. ‘Subaru’ 750 supercharger
running at 1 1/2 engine speed, driven by a toothed belt. Gearbox: Close ratio 3-speed (8lbs lighter than a 4-speed).

Chassis: Lightened standard rails with various tubular and channel
crossmembers.
Wheelbase, 6’ 10”.

Front Axle: Lightened standard straight type axle with transverse
semielliptic spring. Shortened and re configured radias arms.
Friction dampers.

Back Axle: Early type with off-set locked differential, located by
modified trailing quarter-elliptic springs and a ‘Bugatti’ style reaction
arm. Doubled-up friction dampers.

Steering: Standard type steering box operating through an
intermediate crank-arm located at the passenger side radias
arm swivel point to avoid bump-steer. Fabricated steering arm.


Brakes: Cable operated front and rear.
Front brake shoes operating directlyagainst the wire wheel centres without
brake drums. Single drivers side rearbrake operating against a
conventional drum
Print Email
Rate this item
(0 votes)
Read 4575 times Last modified on Monday, 21 May 2012 17:14

Leave a comment