Students on a roll before race

Bunbury Cathedral Grammar School is looking to snare victory at this year's Western Australian Pedal Prix with their secret weapon - the Blue Bullet.

The 10 students aim to win the gruelling six-hour race with their makeshift pedal-powered vehicle when they take on 43 other teams in Busselton on Sunday.

The students have been preparing for the race for more than two months, designing and then building the aerodynamic Blue Bullet.

School challenge and extension coordinator Jane Kirkham said building the pedal-powered vehicle had been a rewarding task for the students.

"It has been a great project from the planning phase all the way to the building process," she said.

"It is a program that we will look to build on and make bigger over time."

Engineers Australia South West member Chris Coates helped the students through the construction process of the vehicle and said the Pedal Prix was a great initiative.

"Engineers Australia hopes to use the Pedal Prix to promote science and engineering in schools," he said.

"The race will certainly be a great spectacle at the Busselton foreshore."

Mrs Kirkham acknowledged the role Mr Coates and Engineers Australia had in helping the students build the Blue Bullet.

"We could not have been involved without the help of Chris Coates and Engineers Australia," she said.