Somebody please tell me...

[Chips86]

...where the hell I'm going wrong on the cross country quick mission. Its the one where you fly the blenheim to france. My problem is whenever i go to take off the plane veers violently to the right, ending up going at pretty much a 45 degree angle to the runway, making it impossible for me to take off.

I'm not usuing complex engine management, and heres my takeoff procedure:

1) Turn engines on
2) Throttle up gently, brakes on
3) Release brakes at about 50 percent throttle, carry on throttling up while rolling
4) Veer to the right, crashing into trees/buildings/hangars/pretty much anything.

I really cannot understand why its doing this. I have tried trimming the rudder to full left - no effect. I have looked for a chock release button but cant find one...is this a bug or am i doing something wrong?