Posted by :
Ray Wakefield -
has been mentioned on page 1, the whole raison d'etre of Motivator is to
test the compatibility of the surface of the chosen site or sites with the
special aluminium alloy wheels that it is necessary to use to achieve
speeds in excess of four hundred miles per hour.
are cast in a high duty alloy and machined all over. They are then
balanced for complete stability at 6000 rpm, and spin tested to
9000rpm. Due to the extreme radial forces to which the rims of these
wheels are subjected at such high rpm, any balancing of the wheels
which is necessary can only be done by scraping to a maximum of 20
thousandths of an inch at the appropriate sections of the inner rim.
All of the wheels weigh approximately 20 kg, and have a rim width of
are three versions of the wheel. All are identical except for the
number of circumferential ribs (keels) that they carry. These are
one, two, or five respectively. A modified pneumatic-tyred
motorcycle front wheel is used in conjunction with the conventional
motorcycle rear wheel for purposes of driver familiarisation,
vehicle testing, and general manoeuvring etc.
The machine is clad in an aluminium skin from the front of the engine bay
to the front bulkhead.