Super Aguri driver Takuma Sato

The debut had been planned for the 16 July French Grand Prix, the 11th round of the 18-race season.

But the Japanese team said events had delayed that to the following race weekend at Hockenheim on 28-30 July.

Honda-powered Super Aguri, who became F1's 11th team this season, said the new SA06 had passed its crash tests.

"The initial SA06 design and build schedule with a deadline of the F1 race at Magny-Cours was extremely tight and with no margin for delay in any area of production," the team said in a statement issued at the US Grand Prix.

According to Super Aguri, the team have been hampered by a delay over a decision on the specification of gearbox to be used, and a technical problem at the wind tunnel in May that halted all model testing for five days.

"The team increased its working hours even further in an attempt to make up for lost ground but have now decided upon a more realistic launch date of 28 July at the German Grand Prix," said the statement.

The team, who started the season with a modified version of a four-year-old Arrows, have been off the pace and have yet to score a point.

They also had to replace Japanese driver Yuji Ide with former Renault tester Franck Montagny of France after the governing body withdrew the rookie's licence.