Hi, I was wondering what is the perfect take off VR.
It depends on so many things. Weight, runway length, takeoff power, etc.
This also may be useful
EGLL, heavy and Boeing 777-300
Just use the thread provided and make your calculations from there ;)
There are several topics regarding this subject.
One example besides the one @ewanfleming linked is this one:
Please try to make an effort by searching before posting in the future.