Just seconds before you wrote your post, I stumbled upon this: http://walaber.com/newton_wiki/index...ewtonUpdate%3F

I now do it like this:
Code:
  inc(FTimeSlices, DeltaTime);

  while FTimeSlices>16 do
  begin
    NewtonUpdate(FNewtonWorld, 16/1000);
    dec(FTimeSlices, 16);
  end;
Works fine. Thank you two.